SUPERPLASTIC BEHAVIOUR OF NiAl AND Ni3Al DUPLEX ALLOY

Acta Metall Sin

1996, Vol. 32

Issue (11): 1139-1143 DOI:

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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)

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LIU Zhenyun; LIN Dongliang; GU Yuefeng (Shanghai Jiaotong Univereity.Shanghai 200030); CAO Peng; LEI Changming; HUANG Boyun (Center South University of Technology; Changsha 410083). SUPERPLASTIC BEHAVIOUR OF NiAl AND Ni3Al DUPLEX ALLOY. Acta Metall Sin, 1996, 32(11): 1139-1143.

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Abstract 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

Key words: NiAl alloy recovery and recrystallization superplasticity

Received: 18 November 1996

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1996/V32/I11/1139

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