Abstract
In this work, a new method of measuring volume fraction of e martensite formed both by cooling and deformation using volume change and endothermic heat on e → γ transformation, respectively. The variation in the amount of e 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 e martensite forming on cooling increases. However, with a decrease in grain size, more e is induced by deformation, improving shape memory effect.
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