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

Issue title: E-MRS Fall Meeting 2005

Article type: Research Article

Authors: Jee, K.K.^{a; *} | Han, J.H.^a | Kim, Y.B.^a | Jang, W.Y.^b

Affiliations: [a] Principal researcher of Division of Materials, Korea Institute of Science and Technology, Seoul 136-791, Korea | [b] Professor of Division of Metallurgical and Materials Engineering, Chosun University, Gwangju 501-759, Korea

Correspondence: [*] Correspondence to: K.K. Jee. Tel.: +82 2 958 5445; Fax: +82 2 958 5449; E-mail: kkjee@kist.re.kr

Abstract: In this work, a new method of measuring volume fraction of ε martensite formed both by cooling and deformation using volume change and endothermic heat on ε→ γ transformation, respectively. The variation in the amount of ε with grain size is determined for an Fe-21Mn alloy, and its influence on shape memory effect is investigated. 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.

Keywords: Fe-Mn alloy, volume fraction of ε martensite, shape memory effect, DSC

DOI: 10.3233/JAE-2006-717

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 23, no. 1-2, pp. 59-64, 2006