Effect of Betatizing Temperature on Transformationn Characteristics and Pseudoelasticity in an Unidirectionally Solidified Cu-Al-Ni Based Alloy

W. Y. Jang 2K. H. Kim 2Kwang K. Jee 1

1. Korea Institute of Science and Technology, Material Science and Engineering Division, Seoul, Korea, South
2. Dept. of Metallurgical Engineering, Chosun University, #375 Seosuk-Dong, Dong-Gu, Gwangju 501-759, Korea, South

Abstract

Cu-Al-Ni based alloy rod could be fabricated by heated-mold continuous casting, which shows unidirectional solidification structure in the [100] direction and the γ2 phase was precipitated in matrix along cast direction. When the rod was betatized at the elevated temperature above 750℃, the γ2 phase is dissolved into the matrix so that Ms temperature was decreased. It could be also confirmed that both β1' and γ1' martensites coexited below - 20 ℃ by DSC measurement. The betatized rod showed pseudoelastic behavior but the stress-strain curves of compressive-deformed rods were not same with betatizing temperature; the stress-strain curves of the specimen betatized at 700℃ were linear but those of the rod betatized above 750 ℃ were non-linear.

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Presentation: poster at E-MRS Fall Meeting 2005, Symposium C, by W. Y. Jang
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-20 14:36
Revised:   2009-06-07 00:44
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