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《ACTA METALLRUGICA SINICA》 1996-11
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SUPERPLASTIC BEHAVIOUR OF NiAl AND Ni3Al DUPLEX ALLOY

LIU Zhenyun; LIN Dongliang; GU Yuefeng (Shanghai Jiaotong Univereity.Shanghai 200030), CAO Peng; LEI Changming; HUANG Boyun (Center South University of Technology, Changsha 410083)  
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.
【Fund】: 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
【CateGory Index】: TG113
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