Microstructure and Superplastic Deformation Behavior of NiAl-15Cr Alloy

Acta Metall Sin

2004, Vol. 40

Issue (5): 494-498 DOI:

Research Articles

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Microstructure and Superplastic Deformation Behavior of NiAl-15Cr Alloy

GUO Jianting; ZHANG Guangye; ZHOU Jian

Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110016

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GUO Jianting; ZHANG Guangye; ZHOU Jian. Microstructure and Superplastic Deformation Behavior of NiAl-15Cr Alloy. Acta Metall Sin, 2004, 40(5): 494-498 .

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Abstract The microstructure and deformation behavior of high temperature tension of a directionally solidified (DS) NiAl-15Cr alloy have been investigated. The results reveal that the microstructure consists of dendritic β-NiAl phase, interdendritic γ/γ' phase and transient layer γ' phase. The alloy shows superplastic behavior when it is deformed under the conditions of temperature range of 1123--1373 K and initial strain rate range of 1.67×10 -4--1.67×10 -2 s-1. The maximum elongation of 280% with m=0.22 is obtained at 1323 K and an initial strain rate of 8.35×10 -3 s-1. The superplastic mechanism for the alloy is also discussed by the observation of the microstructures evolution during the superplastic deformation process.

Key words: directional solidification NiAl--based intermetallics superplasticity

Received: 16 May 2003

ZTFLH:	TG135.3
	TG113.25

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