NiAl和Ni_3Al双相合金的超塑性变形  

SUPERPLASTIC BEHAVIOUR OF NiAl AND Ni3Al DUPLEX ALLOY

作　　者：刘震云[1] 林栋梁[1] 谷月峰[1] 曹鹏[1] 雷长明 黄伯云[1] 

机构地区：[1]上海交通大学,中南工业大学,上海交通大学材料科学系

出　　处：《金属学报》1996年第11期1139-1143,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金;中南工业大学粉末冶金国家重点实验室开发基金

摘　　要：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.

关 键 词：超塑性 镍铝合金 金属间化合物 变形 

分 类 号：TG146.15[一般工业技术—材料科学与工程]