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Cavitation damage incorporating cavity growth in submicrometer-grained titanium alloy

Published online by Cambridge University Press:  31 January 2011

Young Gun Ko ,
Dong Hyuk Shin  and
Chong Soo Lee
Young Gun Ko*
Affiliation:
School of Materials Science and Engineering, Yeungnam University, Gyeongsan 712-749, Republic of Korea
Dong Hyuk Shin
Affiliation:
Department of Metallurgy and Materials Science, Hanyang University, Ansan 425-791, Republic of Korea
Chong Soo Lee
Affiliation:
Department of Materials Science and Engineering, POSTECH, Pohang 790-784, Republic of Korea
*
a) ddress all correspondence to this author. e-mail: [email protected]
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Abstract

A study was made to investigate cavity growth behavior during the superplastic deformation of submicrometer-grained titanium alloy and to compare that to cavity growth in a coarse-grained counterpart. A series of tension tests were performed at a temperature of 973 K and a strain rate of 10−4 s−1. Microstructures revealed that both the size and the volume fraction of the cavities obviously decreased as the grain size decreased. Working within the framework provided by creep models for understanding cavity growth behavior, we found the dominant growth mechanism to be superplastic diffusion, which leads to high-tensile ductility in submicrometer-grained titanium alloy.

Keywords

Grain sizeMicrostructureTi
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 6 , June 2009 , pp. 2161 - 2165
Copyright
Copyright © Materials Research Society 2009

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