2002•Journal of Material Science and TechnologyRequires access

Tensile properties and microstructure of DS NiAl-28Cr-5.8Mo-0.2Hf alloy

C.Y. Cui, Jianhua Guo, Yujie Qi, H. Q. Ye

Abstract

A multiphase alloy NiAl-28Cr-5.8Mo-0.2Hf was directionally solidified in Ar atmosphere in an Al2O3-SiO2 mold by standard Bridgman method. The fracture toughness and tensile properties at 980degreesC as well as tensile creep at 1050degreesC were studied. It was found that the strength of the present alloy is higher than that of many NiAl-based alloy and the stress exponent n for creep is about 6.69. Then the possible strengthening mechanism and creep mechanism are also discussed.

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Key concepts: Nial, Materials science, Creep, Alloy, Ultimate tensile strength, Microstructure, Metallurgy, Composite material