Investigation of the microstructure and physical properties of directionally solidified ternary Al-8.8La-1.2Ni alloy
Küçük Resim Yok
Tarih
2021
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Sa
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
This paper systematically studies the microstructure evolution, microhardness and tensile property of Al-8.8La-1.2Ni ternary alloy with directionally solidified under a wide range of solidification rates by Bridgman-type growth apparatus. The directionally solidified microstructure of studied alloy consists aligned dendrites, and eutectics in the region between them. Primary dendrite arm spacing (lambda(1)), secondary dendrite arm spacing (lambda(2)) and microhardness (HV) were measured from both transverse and longitudinal sections of many samples. Also, ultimate tensile strength (sigma(uts)), tensile yield strength (sigma(tys)), ultimate compressive strength (sigma(ucs)) and compressive yield strength (sigma(cys)) of the solidified many samples at room temperature the dependence of solidification rate (V) were carried out. The present results show that the solidification rate can change both microstructure and mechanical properties effectively. According to these results, it has been found that, for increasing values of V, the values of lambda(1) and lambda(2) decrease, the values of HV, sigma(uts), sigma(tys), and sigma(cys), increase. Relationships between microstructural parameters (lambda(1, )lambda(2)) and mechanical properties (HV, sigma(uts), sigma(tys), and sigma(cys)) expressed as function of solidification rate using a linear regression analysis method. (C) 2020 Elsevier B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
Directional solidification, Ternary alloys, Microstructure, Microhardness, Tensile strength, Compessive strength
Kaynak
Journal of Alloys and Compounds
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
855
