Influence of Rare Earth on Shape Memory and Martensitic Transformation Behaviors of a FeMnSiCr Alloy


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Proper amount of blend rare earth (RE), e.g. less than 0.2 wt%, was added into a Fe25Mn6Si5Cr alloy and showed beneficial effect on its shape memory property. On the other hand, measurements of internal friction revealed that RE-addition reduces the Ms temperature and the amount of thermal-induced martensite. Higher La-content in thin hcp (e) plates than that in fcc (g) matrix was observed by analytical TEM. Thermodynamic calculations also indicated a relatively high equilibrated concentration in e and a strong interaction between La atom and 1/6<112> Shockley dislocation. Except for the grain refinement and solid-solution strengthening effect, the influence of RE on the g ® e martensitic transformation is discussed in taking into account both the Suzuki Effect and Suzuki Lock. The former results in a reduced stacking fault energy, while the Suzuki Lock hinders the movement of Shockley partials and thus the extension of stacking faults.



Materials Science Forum (Volumes 475-479)

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Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie




X. Huang et al., "Influence of Rare Earth on Shape Memory and Martensitic Transformation Behaviors of a FeMnSiCr Alloy", Materials Science Forum, Vols. 475-479, pp. 1995-1998, 2005

Online since:

January 2005




[1] A. Sato et al.: Acta Metall. Vol. 30 (1982), p.1177.

[2] H. Otsuka et al.: Proc. of MRS Intern. Meeting on Adv. Mater., Shape Memory Materials, Tokyo, Japan, 1988, Vol. 9 (MRS, Warrendale, PA, 1989), p.451.

[3] H. Otsuka, et al.: ISIJ International Vol. 30 (1990), p.674.

[4] J. Wan, et al.: Mater. Trans., JIM Vol. 43 (2002), p.920.

[5] S. Kajiwara, D. Liu and T. Kikuchi: Scripta Materialia Vol. 44 (2001), p.2809.

[6] T.Y. Hsu: Proc. of China-Japan Bilateral Symp. on SMA, eds. Y. Chu and K. Otsuka (Intern. Academic Publishers, 1998), p.132.

[7] W.M. Zhou, B.H. Jiang and T.Y. Hsu: Scripta Materialia Vol. 39 (1998), p.1483.

[8] C.X. Zhao: Metall. Mater. Trans. A Vol. 30A (1998), p.2599.

[9] X. Huang, et al.: Mateials Letters Vol. 57 (2003), p.2787.

[10] G. He, et al.: Journal of Shanghai Jiao Tong University Vol. 33 (1999), p.765.

[11] V.N. Belko, et al.: Metal Physics & Metallography Vol. 27 (1969), p.141.

[12] J.W. Christian: The Theory of Transformations in Metals and Alloys (Pergamon Press, Oxford, U.K. 1965).

[13] H. Suzuki: J. Phys. Soc. Japan Vol. 17 (1962), p.322.

[14] R. de Wit and R.E. Howard: Acta Metall. Vol. 13 (1965), p.655.