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Superplasticity in NiAl and NiAl-based alloys

Published online by Cambridge University Press:  31 January 2011

J. J. Guo ,
X. X. Du ,
L. L. Zhou ,
B. D. Zhou ,
Y. Y. Qi  and
G. G. Li
J. J. Guo
Affiliation:
Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, People's Republic of China
X. X. Du
Affiliation:
Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, People's Republic of China, and School of Material Sciences and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
L. L. Zhou
Affiliation:
Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, People's Republic of China
B. D. Zhou
Affiliation:
School of Material Sciences and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
Y. Y. Qi
Affiliation:
Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, People's Republic of China
G. G. Li
Affiliation:
Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, People's Republic of China
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Abstract

Superplastic deformation was realized on NiAl and NiAl-based alloys prepared by both common casting and directional solidification. Directionally solidified NiAl–27Fe–3Nb alloy as well as conventionally cast NiAl, NiAl–25Cr, NiAl–9Mo, NiAl–20Fe–Y.Ce, and NiAl–30Fe–Y alloys exhibited typical deformation characteristics shown in conventionally superplastic materials. NiAl and NiAl-based alloys could be divided into three categories depending on their different superplastic behavior: finely grained structure (NiAl–9Mo, NiAl–25Cr, NiAl–20.4Fe–Y.Ce, NiAl–30Fe–Y), coarsely grained structure (NiAl), and columnar structure (NiAl–27Fe–3Nb). The corresponding deformation mechanisms for fine-grained structure, coarsely grained structure, and columnar structure were grain boundary sliding or grain boundary sliding accompanied by dynamic recrystallization, dynamic recovery and recrystallization, and intragrain dislocation slip, respectively.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 9 , September 2002 , pp. 2346 - 2356
Copyright
Copyright © Materials Research Society 2002

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