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Al-Cu-Si üçlü alaşımının mikroyapısının ve mikrosertliğinin katılaşma hızına ve sıcaklık gradyentine bağlı olarak değişimi
(2023) Üstün, Erkan; Yılmazer, M. İzzettin; Cadirli, Emin
Al-13.6Cu-6Si (%ağ.) üçlü alaşımı sabit bir katılaştırma hızında (V=17.4 ?m/s), farklı sıcaklık gradyentlerinde (1.6-6.12 K/mm) ve sabit bir sıcaklık gradyentinde (G=4.64 K/mm) farklı katılaştırma hızlarında (8.3-166.0 ?m/s) Bridgman tipi doğrusal katılaştırma fırını içerisinde tek yönlü olarak doğrusal bir şekilde katılaştırılmıştır. Katılaştırma işlemi tamamlanan alaşım numuneleri metalografik işlemlere tabi tutularak mikroyapıları açığa çıkartılmıştır. Mikroyapı parametreleri (?1 ve ?2) üzerine katılaştırma parametrelerinin (V ve G) etkisi incelenmiştir. Ayrıca mikrosertliğin katılaşma hızına, sıcaklık gradyentine ve mikroyapı parametrelerine bağımlılığı araştırılmıştır. Bunun yanı sıra elde edilen sonuçlar literatürde yer alan benzer deneysel sonuçlarla kıyaslanmıştır.
Dendritic solidification and characterization of a succinonitrile-acetone alloy
(IOP PUBLISHING LTD, 2006) Ustun, Erkan; Cadirli, Emin; Kaya, Hasan
A succinonitrile (SCN)-3.6 wt% acetone (ACE) alloy was unidirectionally solidified with a constant temperature gradient G = 5.7 K mm(-1) in the growth rate ranges V = 6.5 - 113 mu m s(-1) and a constant growth rate V = 6.5 mu m s(-1) in the temperature gradient ranges G = 3.5-5.7 K mm(-1). The primary dendrite arm spacings, secondary dendrite arm spacings, dendrite tip radius and mushy zone depth were measured as a function of growth rate and temperature gradient. Theoretical models for the dendrite arm spacing and tip radius have been compared with the experimental observations, and a comparison of our results with the current theoretical models and previous experimental results has also been made. The stability constant (s) for this alloy system was measured and this result was compared with various similar organic transparent alloys.
Dependency of structure, mechanical and electrical properties on rotating magnetic field in the Bi-Sn-Ag ternary eutectic alloy
(CARL HANSER VERLAG, 2016) Kaya, Hasan; Cadirli, Emin; Gunduz, Mehmet; Raebiger, Dirk; Eckert, Sven
In the present study, cylindrical samples of the Bi-Sn-Ag ternary eutectic alloy were exposed to a rotating magnetic field (RMF) during upward solidification. The dependence of the eutectic spacing (lambda), microhardness (HV), tensile stress (sigma) and electrical resistivity (rho) of the Bi-Sn-Ag eutectic alloy on the RMF-driven flow was investigated in this study. With the increase in the RMF, the eutectic grains are fragmented and gradually refined until a transition from coarser plate-like structure to a fine fibrous eutectic structure for the alloy. It was found that with the increasing of RMF, lambda decreases but HV, sigma and rho increase. The enthalpy of fusion (Delta H) and specific heat (C-p) for the same alloy was determined by means of differential scanning calorimetry from the heating trace during the transformation from the eutectic liquid to eutectic solid. The results obtained in the present work were compared with published data available in the literature.
Dependency of thermal and electrical conductivity on temperature and composition of Sn in Pb-Sn alloys
(ELSEVIER SCIENCE BV, 2010) Ocak, Yavuz; Aksoz, Sezen; Marasli, Necmettin; Cadirli, Emin
The variations of thermal conductivity with temperature for Pb-Sn alloys were measured using a radial heat flow apparatus. The variations of electrical conductivity with the temperature for same alloys were determined from the Wiedemann-Franz law by using the measured values of thermal conductivity. According to present experimental results, the thermal and electrical conductivity of Pb-Sn alloys linearly decrease with increasing temperature but exponentially increase with increasing the composition of Sn. The enthalpy of fusion and the change of specific heat for Pb-Sn alloys were also determined by means of differential scanning calorimeter (DSC) from heating trace during the transformation from eutectic liquid to eutectic solid. (C) 2010 Elsevier B.V. All rights reserved.
Determination of mechanical, electrical and thermal properties of the Sn-Bi-Zn ternary alloy
(ELSEVIER SCIENCE BV, 2011) Cadirli, Emin; Boyuk, Ugur; Kaya, Hasan; Marasli, Necmettin
The development of lead-free solders has emerged as one of the key issues in the electronics packaging industries. Sn-Zn-Bi eutectic alloy has been considered as one of the lead-free solder materials that can replace the toxic Pb-Sn eutectic solder without increasing soldering temperature. This study investigates the effect of temperature gradient and growth rate on the mechanical, electrical and thermal properties of the Sn-Zn-Bi eutectic alloy. Sn-23 wt.% Bi-5 wt.% Zn alloy was directionally solidified upward with different growth rates (V = 8.3-478.6 mu m/s) at a constant temperature gradient (G = 3.99 K/mm) and with different temperature gradients (G = 1.78-3.99 K/mm) at a constant growth rate (V = 8.3 mu m/s) in the Bridgman-type growth apparatus. The microhardness (HV), tensile stress (sigma(t)) and compressive stress (sigma(c)) were measured from directionally solidified samples. The dependency of the HV, sigma(t), and sigma(c) for directionally solidified Sn-23 wt.% Bi-5 wt.% Zn alloy on the solidification parameters (G, V) were investigated and the relationships between them were obtained by using regression analysis. According to present results. HV, sigma(t) and sigma(c) of directionally solidified Sn-23 wt.% Bi-5 wt.% Zn alloy increase with increasing G and V. Variations of electrical resistivity (rho) for cast samples with the temperature in the range of 300-420 K were also measured by using a standard dc four-point probe technique. The enthalpy of fusion (Delta H) and specific heat (C-p) for same alloy was also determined by means of differential scanning calorimeter (DSC) from heating trace during the transformation from eutectic liquid to eutectic solid. (C) 2011 Elsevier B.V. All rights reserved.
Determination of the thermal properties of ternary Al-La-Ni cast alloy
(Natl Inst Science Communication-Niscair, 2022) Cadirli, Emin; Ustun, Erkan
In current work, thermal conductivity, enthalpy of fusion, specific heat, and thermal diffusivity of the Al-8.8La-1.2Ni cast alloy has been investigated. Chemical element analysis of the studied alloy was determined with X-Ray Fluorescence Spectrometer (XRF) and SEM microscopy with Energy Dispersive X-Ray Spectroscopy (EDS). Thermal conductivity of as -cast Al-8.8La-1.2Ni alloy was measured using comparison cut bar method in the temperature range of 308???773 K. Thermal conductivity values decreased gradually in the studied alloy with the increase of temperature. The thermal temperature coefficient was calculated from the thermal conductivity-temperature graph. The heat flow-temperature curve was obtained by performing Differential Scanning Calorimetry (DSC) analysis. Enthalpy of fusion and specific heat values were also determined. Thermal diffusivity values were calculated as a function of temperature using the relevant equation. It was determined that the thermal diffusivity values increased with increasing temperature.
EFFECT OF GROWTH RATE ON COARSENING OF SECONDARY DENDRITE ARM SPACINGS IN DIRECTIONALLY SOLIDIFIED OF Al-8.8La-1.2Ni TERNARY ALLOY
(Polska Akad Nauk, Polish Acad Sciences, Inst Metall & Mater Sci Pas, 2022) Ustun, Erkan; Cadirli, Emin
One of the most important factors directly affecting microstructure and mechanical properties in directional solidification process is secondary dendrite arm spacing (SDAS). It is very important to measure the SDAS and examine the factors that may affect them. To investigate the effort of growth rate on the SDAS, the alloy specimens were directional solidified upward with different growth rates ( V= 8.3-83.0 mu m/s) at a constant temperature gradient (G = 4 K/mm) in a Bridgman-type growth apparatus. After the specimens are directionally solidified, they were exposed to metallographic processes in order to observe the dendritic solidification structure on the longitudinal section of the specimens. Coarsen secondary dendrite ann spacings (lambda(2C)) were measured excluding the first arms near the tip of the dendrite. Local solidification times (t(f)) were calculated by ratio of spacings to growth rates. It was detennined that the t(f) values decreased with increasing V values. The relationships between t(f) and lambda(2C) were defined by means of the binary regression analysis. Exponent values of t(f) were obtained as 0.37, 0.43, 0.46 and 0.47 according to increasing V values, respectively. These exponent values are close to the exponent value (0.33) predicted by the Rappaz-Boettinger theoretical model and good agreement with the exponent values (0.33-0.50) obtained by other experimental studies.
Effect of Growth Rate on the Microstructure and Microhardness in a Directionally Solidified Al-Zn-Mg Alloy
(SPRINGER, 2016) Acer, Emine; Cadirli, Emin; Erol, Harun; Gunduz, Mehmet
The Al-5.5Zn-2.5Mg (wt pct) ternary alloy was prepared using a vacuum melting furnace and a casting furnace. Five samples were directionally solidified upwards at a constant temperature gradient (G = 5.5 K/mm) under different growth rates (V = 8.3-165 mu m/s) in a Bridgman-type directional solidification furnace. The primary dendrite arm spacing, lambda (1), secondary dendrite arm spacing, lambda (2), and microhardness, HV, of the samples were measured. The effects of V on lambda (1), lambda (2) and HV properties of the Al-Zn-Mg alloy were studied by microstructure analysis and mechanical characterization. Microstructure characterization of the alloys was carried out using optical microscopy, scanning electron microscopy, wavelength-dispersive X-ray fluorescence spectrometry, and energy dispersive X-ray spectroscopy. From the experimental results, it is found that the lambda (1), lambda (2) values decrease, but HV values increase with the increase in V, and HV values decrease with the increase in lambda (1) and lambda (2). Dependencies of dendritic spacing and microhardness on the growth rate were determined using linear regression analysis. The growth rate, microstructure, and Hall-Petch-type relationships obtained in this work have been compared with the results of previous studies.
Effect of Growth Velocity and Zn Content on Microhardness in Directionally Solidified Al-Zn Alloys
(Univ Fed Sao Carlos, Dept Engenharia Materials, 2018) Acer, Emine; Cadirli, Emin; Erol, Harun; Kaya, Hasan; Sahin, Mevlut; Gunduz, Mehmet
In this study, Al-xZn (x=1, 3, 5, 7, 10 and 20 wt. %) alloys were prepared using metals of 99.99% high purity in the vacuum atmosphere. These alloys were directionally solidified upward with a constant temperature gradient, G (10.3 K/mm) and different growth velocities (V) between 8.25 and 165 mu m/s in the directional solidification apparatus. The experimental results have revealed that with the increase of the growth velocity of the melts from 8.25 mu m/s to 165 mu m/s, the microstructures undergo a transition from cellular/cellular dendritic morphology to coarse dendritic form for each composition (Zn content, C-o). The measurements of microhardness (HV) of the specimens were performed by using a microhardness test device. The dependence of HV on V and C(o )was analyzed, and it has been found that with increasing the V and C-o the HV increases. Relationships between HV-V and HV-C-o were obtained by linear regression analysis, and the experimental results were compared with the results of previous similar works.
Effect of growth velocity on microstructure and mechanical properties of directionally solidified 7075 alloy
(Taylor & Francis Ltd, 2020) Cadirli, Emin; Nergiz, Emel; Kaya, Hasan; Buyuk, Ugur; Sahin, Mevlut; Gunduz, Mehmet
7075 alloys were prepared using metals of 99.99% high purity in the vacuum atmosphere. These alloys were directionally solidified upwards under various growth velocities (8.3-166.0 mu m/s) using a Bridgman-type directional solidification furnace. Dendritic spacings (lambda(1), lambda(2)) and microhardness (HV) were measured from both longitudinal and transverse sections of the samples. Ultimate tensile strength (sigma(U)) and yield strength (sigma(y)) of the solidified samples at room temperature were examined. The HV increased from 75.2 to 112.8 MPa, the sigma(U) increased from 155.8 to 210.1 MPa, and the sigma(y) increased from 198.4 to 319.8 MPa with increasing growth velocity from 8.3 to 166.0 mu m/s. Exponent values of the V for the lambda(1), lambda(2), HV, sigma(U) and sigma(y) were calculated as 0.27, 0.41, 0.05, 0.11 and 0.15, respectively. The results show that the hot tearing in the 7075 alloy is caused by the fracture of dendrites structures.
Effect of Heat Treatment on the Microstructures and Mechanical Properties of Al-4Cu-1.5Mg Alloy
(Springer Int Publ Ag, 2022) Cadirli, Emin; Kaya, Hasan; Buyuk, Ugur; Ustun, Erkan; Gunduz, Mehmet
In this work, the influence of different heat treatments (HT) processes on the microstructure and mechanical properties of cast Al-4Mg-1.5 Mg alloy was investigated. To investigate the effect of HT, firstly Al-4Cu-1.5Mg samples were homogenized (solution treatment) at 500 degrees C/2h, water quenched at room temperature (RT) and then immediately exposed to an artificial aging process at 200 degrees C for various aging times of 1, 4, 8, 12, 16, 20 and 24 hours. Quantitative examinations after HT processes (solution treatment and aging) have shown that intermetallic phases (Al2Cu and Al2CuMg) were dissolved in the alpha-Al matrix phase and distributed along the grain boundary. Some mechanical properties (HV sigma, sigma(TYS), sigma(UTS), sigma(CYS), E and delta) of a sufficient number of alloy samples exposed to different heat treatments were examined in detail. The data obtained show that the conditions of solution treatment and aging in some conditions show superior mechanical properties than the sample in the form as-cast. The highest microhardness value (126 HV) was obtained for the alpha-Al matrix phase, which was subjected to solution treatment (only homogenization). After aging for 1h at 200 degrees C, the peak value of microhardness was achieved as 289.5 HV for intermetallic phases. The highest tensile strength (sigma(UTS)) was obtained as 328 MPa for the sample which aged for 8h at 200 degrees C after solution treatment for 2h at 500 degrees C.
EFFECT OF HEAT TREATMENT ON THE MICROSTRUCTURES AND MECHANICAL PROPERTIES OF AL-4CU-1.5MG ALLOY (vol 16, pg 1020, 2021)
(Springer Int Publ Ag, 2024) Cadirli, Emin; Kaya, Hasan; Buyuk, Ugur; Ustun, Erkan; Gunduz, Mehmet
[Abstract Not Available]
Effect of heat treatment on the microstructures and mechanical properties of Al-5.5Zn-2.5Mg alloy
(ELSEVIER SCIENCE SA, 2016) Acer, Emine; Cadirli, Emin; Erol, Harun; Kirindi, Talip; Gunduz, Mehmet
The Al-5.5 Zn-2.5 Mg (wt%) ternary alloy was prepared using a vacuum melting furnace and a casting furnace. Microstructural and mechanical properties of the alloy were investigated as-cast and under heat-treated conditions. To investigate the effect of heat treatment, numerous designed Al-5.5 Zn-2.5 Mg samples were homogenized under different conditions and then aged under different regimes. The effects of heat treatment on the microstructures were examined by OM, SEM, and TEM, and mechanical properties of the Al-Zn-Mg alloy were studied. A good combination of high microhardness and reasonable tensile strength were obtained by successive and suitable heat treatments. After aging for 24 h at 150 degrees C, the peak microhardnes and tensile strength values were achieved as 157 MPa and 188.8 MPa, respectively. The microscopic fracture surfaces of the aged samples under different homogenization and aging conditions were observed using scanning electron microscopy. Fractographic analysis of the tensile fracture surfaces shows that the type of fracture changed significantly from ductile to more ductile depending on the aging regime. (C) 2016 Elsevier B.V. All rights reserved.
Effect of heat treatments on the microhardness and tensile strength of Al-0.25 wt.% Zr alloy
(ELSEVIER SCIENCE SA, 2015) Cadirli, Emin; Tecer, Hicran; Sahin, Mevlut; Yilmaz, Elif; Kirindi, Talip; Gunduz, Mehmet
In the present work, the effect of heat treatments on the microhardness and tensile properties of the Al-0.25 Zr (wt.%) alloy have been investigated. The Al-0.25 Zr (wt.%) alloy was melted in a vacuum furnace, and the molten alloy was poured into crucibles held in a hot filing furnace. Then, the samples were directionally solidified from bottom to top and aged isothermally and isochronally in a muffle furnace. Aging was performed in two ways: using a wide range of temperatures (350-600 degrees C) with a constant aging time (100 h) and a wide range of aging times (3-240 h) with a constant temperature (400 degrees C). The dependence of the microhardness (HV) and ultimate tensile strength (sigma(UTS)) on the aging temperatures and aging times was determined. According to the experimental results, the HV and sigma(UTS) values of the aged samples increase at a certain aging temperature and aging time values, reaching peak values at specific temperatures and aging times. The microhardness and ultimate tensile strength decreased with further increase of aging temperatures and aging times. The microscopic fracture surfaces of the aged samples under different aging conditions were observed using scanning electron microscopy. Fractographic analysis of the tensile fracture surfaces shows that the type of fracture changed significantly from ductile to brittle depending on the aging times. Transmission electron microscopy was also used to characterize the precipitation processes in an Al-0.25 Zr (wt.%) alloy aged at 400 degrees C for 120 h. (C) 2015 Elsevier B. V. All rights reserved.
Effect of rotating magnetic field on the microstructures and physical properties of Al-Cu-Co ternary eutectic alloy
(ELSEVIER SCIENCE SA, 2015) Cadirli, Emin; Kaya, Hasan; Raebiger, Dirk; Eckert, Sven; Gunduz, Mehmet
The solidification microstructures and physical properties of Al-Cu-Co ternary eutectic alloy were studied in a rotating magnetic field (RMF). The RMF-driven flow was the key factor causing grain refinement and uniformity of solidification microstructures. The temperature distributions during solidification were recorded under the conditions with and without RMF. The dependence of the eutectic spacing (lambda), the microhardness (HV), tensile strength (sigma(t)) and compressive strength (sigma(c)) on the RMF were investigated. Electrical resistivity (rho) measurements of the studied alloy were also performed by using the four-point probe method and the dependence of the resistivity on temperature and RMF were determined. Besides, the enthalpy (Delta H) and the specific heat (C-p) values were determined by the differential scanning calorimeter (DSC) analysis. Important changes were found in the microstructure, microhardness, tensile strength, compressive strength and electrical resistivity of the studied alloy with increasing RMF. (C) 2015 Elsevier B.V. All rights reserved.
Effect of silicon content on microstructure, mechanical and electrical properties of the directionally solidified Al-based quaternary alloys
(Elsevier Science Sa, 2017) Cadirli, Emin; Buyuk, Ugur; Engin, Sevda; Kaya, Hasan
Effect of silicon content on the microstructure (lamellar and flake), mechanical (microhardness, ultimate tensile strength) and electrical resistivity properties of Al-Cu-Fe-Si quaternary alloys has been investigated. Al-26Cu-0.5Fe-xSi (x = 6.5, 8, 10, 12 and 14 wt %) were prepared using metals of 99.99% high purity in the vacuum atmosphere. These alloys were directionally solidified under constant temperature gradient (8.50 Minim) and growth rate (8.25 mu m/s) by using a Bridgman type directional solidification furnace. Eutectic spacing, microhardness, ultimate tensile strength and electrical resistivity were expressed as functions of composition. The dependency of the eutectic spacing, microhardness, tensile strength and electrical resistivity on the composition (Si content) were determined. According to experimental results, the microhardness, ultimate tensile strength and electrical resistivity of the solidified samples increase with increasing the Si content, but decrease eutectic spacing. Variation of electrical resistivity with the temperature in the range of 300-650 K for studied alloys was also measured by using a standard d.c. four point probe technique. (C) 2016 Elsevier B.V. All rights reserved.
Effect of solidification parameters on mechanical properties of directionally solidified Al-Rich Al-Cu alloys
(KOREAN INST METALS MATERIALS, 2013) Cadirli, Emin
Al(100-x)-Cu-x alloys (x=3 wt%, 6 wt%, 15 wt%, 24 wt% and 33 wt%) were prepared using metals of 99.99% high purity in vacuum atmosphere. These alloys were directionally solidified under steady-state conditions by using a Bridgman-type directional solidification furnace. Solidification parameters (G, V and ), microstructure parameters (lambda(1), lambda(2) and lambda(E)) and mechanical properties (HV, sigma) of the Al-Cu alloys were measured. Microstructure parameters were expressed as functions of solidification parameters by using a linear regression analysis. The dependency of HV, sigma on the cooling rate, microstructure parameters and composition were determined. According to experimental results, the microhardness and ultimate tensile strength of the solidified samples was increased by increasing the cooling rate and Cu content, but decreased with increasing microstructure parameters. The microscopic fracture surfaces of the different samples were observed using scanning electron microscopy. Fractographic analysis of the tensile fracture surfaces showed that the type of fracture significantly changed from ductile to brittle depending on the composition.
Influences of Growth Velocity and Fe Content on Microstructure, Microhardness and Tensile Properties of Directionally Solidified Al-1.9Mn-xFe Ternary Alloys
(Univ Fed Sao Carlos, Dept Engenharia Materials, 2017) Cadirli, Emin; Aker, Aynur; Kaygisiz, Yusuf; Sahin, Mevlt
In this study, influences of growth velocity and composition (Fe content) on the microstructure (rod spacing) and mechanical properties (microhardness, ultimate tensile strength and fracture surface) of Al-Mn-Fe ternary alloys have been investigated. Al-1.9 Mn-xFe (x= 0.5, 1.5 and 5 wt. %) were prepared using metals of 99.99% high purity in the vacuum atmosphere. At a constant temperature gradient (6.7 K/mm), these alloys were directionally solidified upwards under various growth velocities (8.3-978 mu m/s) using a Bridgman-type directional solidification furnace. The results show that two kinds of Al-rich alpha-Al phase and Fe-rich intermetallic (Al 6 FeMn) phase may be present in the final microstructures of the alloys when the Fe content increases from 0.5 wt.% to 5 wt.%. Al 6 FeMn intermetallic rod spacing, microhardness and ultimate tensile strength were measured and expressed as functions of growth velocity and Fe content by using a linear regression analysis method. According to experimental results, the microhardness and ultimate tensile strength of the solidified samples increase with increase in the growth velocity and Fe content and decrease in rod spacing. The elongations of the alloys decrease gradually with increasing growth velocity and Fe content.
Interfacial energy of solid bismuth in equilibrium with Bi-In eutectic liquid at 109.5 degrees C equilibrating temperature
(KOREAN INST METALS MATERIALS, 2008) Ocak, Yavuz; Akbulut, Sezen; Marasli, Necmettin; Keslioglu, Kazim; Boeyuk, Ugur; Kaya, Hasan; Cadirli, Emin
The interfacial energy of solid bismuth (Bi) in equilibrium with Bi-In eutectic liquid was determined for the equilibrating temperature of 109.5 degrees C. A radial temperature gradient on the sample was established by heating it from the center with a single heating wire and cooling the outside of the sample at -10 degrees C with a heating/refrigerating circulating bath containing an aqueous ethylene glycol solution. The equilibrated grain boundary groove shapes of solid Bi in equilibrium with Bi In eutectic liquid (Bi- 47.3 at.%In) were observed from a sample quenched at 109.5 degrees C. The Gibbs-Thomson coefficient and the solid-liquid interfacial energy of the solid Bi in equilibrium with Bi In eutectic liquid were determined to be (8.4 +/- 0.4) x 10(-8) K in and (54.0 +/- 5.4) x 10(-3) J m(-2) from the observed grain boundary groove shapes. The grain boundary energy of the solid Bi phase was calculated to be (105.5 +/- 11.6) x 10(-3) J m(-2) by considering a force balance at the grain boundary grooves. The thermal conductivities of Bi-47.3 at.%In eutectic liquid phase and the solid Bi-47.3 at.%In phase and their ratio at 109.5 degrees C were measured with a radial heat flow apparatus and a Bridgman type growth apparatus.
Investigation of mechanical, electrical, and thermal properties of a Zn-1.26 wt% Al alloy
(SPRINGER, 2011) Cadirli, Emin; Sahin, Mevlut
Zn-1.26 wt% Al alloy was directionally solidified upward with a constant growth rate (V = 16.6 mu m/s) in a wide range of temperature gradients (1.94-5.15 K/mm) and with a constant temperature gradient (G = 5.15 K/mm) in a wide range of growth rates (8.3-500 mu m/s) with a Bridgman-type directional solidification furnace. The microhardness (HV) and tensile strength (sigma) of alloy were measured from directionally solidified samples. The dependency of the microhardness, tensile strength for directionally solidified Zn-1.26 wt% Al alloy on the solidification parameters (G, V) and microstructure parameters (lambda(1), lambda(2)) were investigated and the relationships between them were experimentally obtained using regression analysis. According to present results, the microhardness and tensile strength of directionally solidified Zn-1.26 wt% Al alloy increase with increasing solidification processing parameters and decrease with the microstructure parameters. Variations of electrical resistivity (rho) with the temperature in the range of 300-650 K were also measured using a standard dc four-point probe technique for cast samples. The enthalpy of fusion and specific heat for same alloy was also determined by means of differential scanning calorimeter (DSC) from heating trace during the transformation from solid to liquid.

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