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    Dendritic growth in an aluminum-silicon alloy
    (ASM INTERNATIONAL, 2007) Kaya, H.; Cadirli, E.; Guenduez, M.
    Unidirectional solidification experiments have been carried out on an Al-3 wt.% Si alloy as a function of temperature gradient, G and growth rate, V. The samples were solidified under steady-state conditions with a constant growth rate of 8.20 mu m/s at different temperature gradients (1.97-6.84 K/mm) and with a constant temperature gradient (6.84 K/mm) at different growth rates (8.20-492.76 mu m/s). Microstructure parameters (primary dendrite arm spacing, lambda(1), secondary dendrite arm spacing, lambda(2), dendrite tip radius, R and mushy zone depth, d) were measured as a function of temperature gradient and growth rate. The experimental results have been compared with the current theoretical models and similar experimental works.
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    Dependency of microindentation hardness on solidification processing parameters and cellular spacing in the directionally solidified Al based alloys
    (ELSEVIER SCIENCE SA, 2009) Kaya, H.; Guenduez, M.; Cadirli, E.; Marasli, N.
    Al based alloys (Al-0.1 wt.%Ti, Al-05 wt.%Ti and Al-2 wt.%Li) were prepared using metals of 99.99% high purity in the vacuum atmosphere. These alloys were directionally solidified upward with the different temperature gradients, G, at a constant growth rate, V, and also with the different V at a constant G in the directional solidification apparatus. Cellular spacing, lambda, and microindentation hardness, HV, were measured from both transverse and longitudinal sections of the specimen as a function of solidification processing parameters (G, V and cooling rate, (T) over dot). Dependency of microindentation hardness on the solidification processing parameters and cellular spacing (lambda) in the directionally solidified aluminum alloys were experimentally investigated and the relationships between the solidification processing parameters and microindentation hardness, and cellular spacing and microindentation hardness were obtained by linear regression analysis. The results obtained in this work have been compared with the previous similar experimental results obtained for binary alloys. (C) 2008 Elsevier B.V. All rights reserved.