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.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/3523 must be provided.

1. Copper plating on carbon nanotube for manufacturing aluminum matrix composites
2. Effect of oxidation on transformation and deformation behavior in Ni-Ti alloy
3. Marvellous method for improving properties of SMA coil springs
4. Effect of Wheel Speed on Transformation Charcteristics in Rapidly Solidified Fe-Mn-Si Based SMA Ribbons
5. Effect of Betatizing Temperature on Transformationn Characteristics and Pseudoelasticity in an Unidirectionally Solidified Cu-Al-Ni Based Alloy
6. Stabilization and Destabilization in Melt-spun Cu-Al-Ni Based SMA Ribbons