Investigation of superplastic behavior of NiAl and Ni{sub 3}Al duplex alloy
- Shanghai Jiao Tong Univ. (China). Dept. of Materials Science
The superplastic behavior of a NiAl and Ni{sub 3}Al duplex alloy was investigated. It was found that the alloy exhibits superplastic behavior over a narrow temperature range, from 975 C to 1,025 C at the strain rate of 1.52 {times} 10{sup {minus}4}s{sup {minus}1}. A maximum tensile elongation of 149% was obtained at 1,000 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: {dot {var_epsilon}} = Ao{sup 2.67} exp({minus}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.
- Sponsoring Organization:
- National Natural Science Foundation of China, Beijing, BJ (China)
- OSTI ID:
- 571824
- Report Number(s):
- CONF-961202--
- Country of Publication:
- United States
- Language:
- English
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