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Investigation of Superplastic Behavior of NiAI and Ni3Al Duplex Alloy

Published online by Cambridge University Press:  15 February 2011

Liu Zhenyun ,
Lin Dongliang ,
T. L. Lin ,
Gu Yuefeng  and
Shan Aidang
Liu Zhenyun
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P.R. China
Lin Dongliang
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P.R. China
T. L. Lin
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P.R. China
Gu Yuefeng
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P.R. China
Shan Aidang
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P.R. China
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Abstract

The superplastic behavior of a NiAI and Ni3Al duplex alloy was investigated. It was found that the alloy exhibits superplastic behavior over a narrow temperature range, from 975 °C to 1025°C at the strain rate of 1.52 × 10-4 s-1. A maximum tensile elongation of 149% was obtained at 1000°C 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 = Ao2.67 exp(-303,000 / RT). Optical microstructure and TEM observation show that the superplastic behavior mechanism of the investigated alloy is a process of continuous recovery and recrystallization during deformation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 461
Copyright
Copyright © Materials Research Society 1997

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References

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