Paper Title:
A Study on Mechanical Behavior and Microstructural Evolution in the Superplastic Deformation of Ti75 Alloy
  Abstract

Superplastic forming provides a good way for Ti alloys which are usually difficult to be deformed. Ti75 alloy with a nominal composition of Ti-3Al-2Mo-2Zr is a newly developed corrosion resistant alloy, with a middle strength and high toughness. In the present paper, superplastic behavior of the alloy was investigated, the microstructural evolution in superplastic deformation was observed and the superplastic deformation mechanisms were analyzed. The results showed that the strain rate sensitivity, m, of the Ti75 alloy was larger than 0.3 and the strain was over 2.0 without surface cracking at 800°C and 5×10-4s-1 in compressive testing. During the first stage of superplastic deformation, a phase grains became equiaxed, fine and homogeneous due to the recrystallization in a phase and diffusion in b phase. Newly formed equiaxed a grains then could slide and rotate, exhibiting superplastic features. The stress concentration caused by grain sliding of a grains could be released by slip and diffusion in b phase between the a phase grains, which acted as accommodation mechanisms.

  Info
Periodical
Materials Science Forum (Volumes 475-479)
Main Theme
Edited by
Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie
Pages
2969-2972
DOI
10.4028/www.scientific.net/MSF.475-479.2969
Citation
C. L. Li, H. Ding, Y. Q. Zhao, L. Zhou, "A Study on Mechanical Behavior and Microstructural Evolution in the Superplastic Deformation of Ti75 Alloy", Materials Science Forum, Vols. 475-479, pp. 2969-2972, 2005
Online since
January 2005
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Price
$32.00
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