A Study on Superplastic Behavior and Microstructural Evolution of an Isothermally Forged TiAl Based Alloy

Abstract:

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Superplastic behavior and microstructure evolution of an isothermally forged Ti-47Al-1Cr-1V-1.5Mo-1.5Nb alloy were investigated. The results showed that the strain rate sensitivity index, m, increased with strain during the superplastic deformation, and it kept as a constant when the strain reached a certain value. The maximum value of m was 0.53 at 900°C and strain rate of 5x10-4 s-1. During the superplastic deformation, the as received material with lamellae and subgrains were refined due to dynamic recrystallization, and small and equiaxed grains with high angle boundaries were formed, creating a better condition for superplastic deformation. Grain boundary sliding and boundary migration were the main superplastic deformation mechanisms and slip and twining were also very important during the superplastic deformation of the alloy.

Info:

Periodical:

Materials Science Forum (Volumes 551-552)

Edited by:

K.F. Zhang

Pages:

463-466

DOI:

10.4028/www.scientific.net/MSF.551-552.463

Citation:

H. Ding et al., "A Study on Superplastic Behavior and Microstructural Evolution of an Isothermally Forged TiAl Based Alloy", Materials Science Forum, Vols. 551-552, pp. 463-466, 2007

Online since:

July 2007

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Price:

$35.00

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