Open Access
Article Number 02015
Number of page(s) 5
Section Principles, Simulations, Materials: Background
Published online 01 September 2009
ESOMAT 2009, 02015 (2009)
DOI: 10.1051/esomat/200902015

Role of Si on the shape memory property of Fe-Mn-Si-C based alloys

M. Koyama1, T. Sawaguchi2, M. Murakami3 and K. Tsuzaki1, 2

1  University of Tsukuba, 1-1-1 Tennoudai Tsukuba Ibaraki 305-8571, Japan
2  National Institute for Materials Science, 1-2-1 Sengen Tsukuba, Ibaraki 305-0047, Japan
3  Shibaura Institute of Technology, 3-7-5 Toyosu Koto, Tokyo 135-8548, Japan

Published online: 1 September 2009

Si content dependence of the shape memory effect (SME) associated with the ε-martensitic transformation has been investigated in Fe-17Mn-xSi-0.3C (x=0,2,4,6) alloys (mass%). By conducting tensile deformations and subsequent heating to above the Af, it has been found that reduction of mere 2% Si content from 6% to 4% obviously deteriorates the SME. The Neel and Ms temperatures in both Fe-17Mn4%Si-0.3C and Fe-17Mn6%Si-0.3C alloys are content with the conditions concerning the good SME. By obtaining stress-strain curves at various temperatures, it has been found that the Fe17Mn-4Si-0.3C alloy has similar critical stresses for ε-martensitic transformation and slip deformation to the critical stresses in the Fe-17Mn-6Si-0.3C alloy. As a consequence, the SME in Fe-Mn-Si-C system sometimes does not appear, even if ε-martensitic transformation preferentially occurs.

© Owned by the authors, published by EDP Sciences 2009