Effect of grain size on amount of deformation-induced ε martensite and shape memory alloy in Fe-Mn Alloy

Kwang K. Jee 

Korea Institute of Science and Technology, Material Science and Engineering Division, Seoul, Korea, South

Abstract

Effect of grain size on amount of deformation-induced ε martensite and shape memory alloy in Fe-Mn Alloy

K. K. Jee*, J. H. Han* and W. Y. Jang**

* Division of Materials, Korea Institute of Science and Technology, Seoul 136-791, Korea
** Division of Metallurgical and Materials Engineering, Chosun University, Gwangju 501-759, Korea


Abstract
In this work, a new method of measuring volume fraction of deformation-induced ε martensite for Fe-Mn alloys is proposed using endothermic heat on ε→γ transformation. The variation in the amount of ε induced by deformation with grain size is determined for an Fe-21Mn alloy, and its influence on shape memory effect is investigated.
∆H/mole on reverse transformation for the alloy is obtained by comparing ∆H and the volume fraction of martensite. The latter is calculated from dilatometric work using the specific volume difference between γ and ε.
As grain size increases, the amount of ε martensite forming on cooling increases. However, with a decrease in grain size, more ε is induced by deformation, improving shape memory effect.

 

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Presentation: oral at E-MRS Fall Meeting 2005, Symposium C, by Kwang K. Jee
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-16 01:30
Revised:   2009-06-07 00:44