INVESTIGATION ON MICROSTRUCTURE AND SUPERPLASTICITY OF A NiAL-BASED MULTIPHASE ALLOY

Acta Metall Sin

1998, Vol. 34

Issue (11): 1121-1125 DOI:

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INVESTIGATION ON MICROSTRUCTURE AND SUPERPLASTICITY OF A NiAL-BASED MULTIPHASE ALLOY

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CHEN Rongshi;GUO Jianting;YIN Weimin;ZHOU Jiyang (Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)(Department of Materials Engineering; Dalian University of Technology;Dalian 116023). INVESTIGATION ON MICROSTRUCTURE AND SUPERPLASTICITY OF A NiAL-BASED MULTIPHASE ALLOY. Acta Metall Sin, 1998, 34(11): 1121-1125.

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Abstract

The microstructure of a NiAl-based multiphase alloy with a composition of Ni-25Al-25Cr has been investigated, which consists of NiAl matrix surrounded by a eutectic of α-Cr, β-Ni(Al,Cr) and γ'-Ni3(Al,Cr), and a large amount of α-Cr precipitates distributed uniformly in NiAl matrix. This alloy exihibits superplasticity elongation as high as up to 480% at 1123-1223 K and strain rates of 2.2×10-4 -3.3×10-2 s-1. The fracture after superplasticity deformation results from cavities generated by grain boundary sliding and cleavage in the grains, the mechanism for superplasticity has also been discussed.

Key words: NiAl superplasticity microstructure fracture mechanism NiAl superplasticity microstructure fracture mechanism

Received: 18 November 1998

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1998/V34/I11/1121

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