발간논문

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Vol.33, No.6, 826 ~ 833, 1995
Title
Superplasticity of Intermetallic Compound Ni3Al
홍순성Soon Sung Hong, 권숙인S . I . Kwun
Abstract
The effect of microstructure on the superplastic deformation of Ni₃Al - base alloys produced by mechanical alloying (MA) was investigated. Metallographic examination of hot-extruded MA powders showed sub-micron size grains consisting of Ll₂-type ordered Ni₃Al and disordered γ phase dispersed with oxides. The refined grain size and the oxide dispersoids contributed to the typical fine grain superplastic deformation behavior. The maximum elongation of 391% was obtained by the tensile test at 1000℃ under a strain rate of 1.0×10^(-2)/s, and the strain rate sensitivity exponent (m) value was about 0.3 in the strain rate range from 1.0×10^(-3)/s to 3.16×10^(-2)/s. The results indicate that the mechanical alloying process is suitable for the aroduction of fine grained intermetallic compounds and the improvement of superplastic properties at high strain rate.
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