研究了ＮｉＡｌ和Ｎｉ３Ａｌ双相合金在高温超塑性变形行为．结果表明：该合金在９７５至１０２５℃的温度范围及应变速率为１５２×１０（－４）ｓ（－１）时，表现出超塑性变形行为；１０００℃时最大拉伸延伸率为１４９％，此时对应的应力敏感指数为０．３７５．该合金的超塑性形变可用经验公式ε＝Ａσ（２．６７）ｅｘｐ（－３０３０００／ＲＴ）来表示。对拉伸后试样的金相和ＴＥＭ研究表明，合金中ＮｉＡｌ和Ｎｉ３Ａｌ两相在高温能够较好地协同形变，超塑性是由变形过程中发生的连续回复与再结晶过程来实现的．
NiAl and Ni3Al duplex alloy exhibits superplastic behavioar over a narrow temperature range from 975 to 1025℃at the strain rate of 1.52 ×10(-4) s(-1). A maximum tensile elongation of 149% was obtained at 1000℃with the strain rate sensitivity up to 0.375.The superplastic deformation of the duplex alloy can be approximately described by an empirical equation of the form: ε= Aσ2.67exp(-303000 /RT). Optical microstructure and TEM observation showed that the superplastic behavior mechanism of the investigated alloy is a process of continuous recovery and recrystallization during deformation. Correspondent. LIN Dongliang, professor, Department of Materials Science, Shanghai Jiaotong Univereity,Shanghai 200030
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