本文研究了金属间化合物Ni—25Al—25Cr的显微组织和超塑性及其变形机理.该合金的显微组织由NiAl则基体和α-Cr，β-Ni（Al，Cr）；γ'-Ni3（Al,Cr）的三元共晶体组成，在NiAl基体中还均匀分布着大量弥散的α-Cr沉淀相在1123—1223K之间以22×10-43．3×10－2S－1的应变速率拉伸变形时．该合金表现出高达480％的超塑性超塑性变形的断裂主要是由于晶界滑移和晶粒转动所产生的空洞和晶内解理所致.本文还对超塑性变形的机理进行了初步讨论.
The microstructure of a NiAl-based multiphase alloy with a composition of Ni-25Al-25Cr has been investigated, which consists of NiAl matrix surrounded by a eutectic of α-Cr, β-Ni(Al,Cr) and γ'-Ni3(Al,Cr), and a large amount of α-Cr precipitates distributed uniformly in NiAl matrix. This alloy exihibits superplasticity elongation as high as up to 480% at 1123-1223 K and strain rates of 2.2×10-4 -3.3×10-2 s-1. The fracture after superplasticity deformation results from cavities generated by grain boundary sliding and cleavage in the grains, the mechanism for superplasticity has also been discussed.
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