Effects of ECAE and Aging on Phase Transformations and Superelasticity of a Ni-Rich TiNi SMA

Abstract:

Effects of equal-channel angular extrusion (ECAE) process at 773K and heat treatment on phase transformations and superelasticity of a Ni-rich TiNi shape memory alloy were investigated by differential scanning calorimeter (DSC) measurement and cyclic tensile test. The R phase transformation of Ni-rich TiNi alloy was stimulated after ECAE processes and within a larger temperature range. The martensitic transformation start temperature Ms of Ni-rich TiNi alloy decreased sharply after ECAE processes at 773 K, then rapidly rose back after the specimen aging at 773K for 30min. Reasons for the changes of phase transformation behaviors have been discussed. ECAE processed TiNi samples exhibit better super-elasticity than solution treated one. With the increase passes of ECAE, the superelasticity becomes more stable, and a completely recoverable strain of 6% is obtained for TiNi sample after 8 passes ECAE.

• Periodical: Materials Science Forum (Volume 682)
• Pages: 185-191
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.682.185
• Online since: March 2011
• Authors: Xiao Ning Zhang, Jie Song, Hong Jiang, Xiao Gang Sun, Chao Ying Xie
• Keywords: Equal Channel Angular Extrusion (ECAE), Phase Transformation, Superelasticity, TiNi Alloy

References

[1] Y. Li, L. Cui, Y. Zheng, D. Yang: Mater Lett. Vol. 51(2001), p.73.

[2] Z. Fan, C. Xie: Advanced Materials Research Vol. 26-28 (2007), p.381.

[3] Z. Fan, C. Xie: Materials Letters Vol. 62 (2008), p.800.

[4] Z. Fan, C. Xie: Advanced materials Research Vol. 26-28 (2007), p.385.

[5] Y. Liu, M. Blanc, G. Tan, etc: Mater Sci Eng A Vol. 438-440 (2006), p.617.

[6] V.V. Stolyarov, Y.T. Zhu, I.V. Alexandrov, etc: Mater. Sci. Eng. A. Vol. 343 (2003), p.43.

[7] C. Xie, Z. Fan: Materials Science Forum Vol. 503-504 (2006), p.1013.

[8] C. Xie, Z. Fan: Materials Science Forum Vol. 561-565 (2007), p.877.

[9] V.M. Segal, V.I. Reznikov, A.E. Drobyshevskiy, V.I. Kopylov: Russian Metall Vol. 1 (1981), p.99.

[10] V.M. Segal, USSR Patent 575, 892. (1977).

[11] J.R. Bowen, O.V. Mishin, P.B. Prangnell, D. Juul Jensen: Scripta Mater. Vol. 47 (2002), p.289.

DOI: 10.1016/s1359-6462(02)00109-4

[12] M. Furukawa, Y. Fukuda, K. Oh-ishi, et al: Mater. Sci. Forum Vol. 426-432 (2003), p.2711.

[13] C. Pithan, T. Hashimoto, M. Kawazoe, et al: Mater. Sci. Eng. A Vol. 280 (2000), p.62.

[14] R.Z. Valiev, I.V. Alexandrov: Nanostruct. Mater. Vol. 12 (1999), p.35.

[15] K. Short, R. Wuhrer, G. Collins, et al: Mater. Sci. Forum Vol. 426-432 (2003), p.2369.

[16] S.L. Semiatin, D.P. Delo: Mater. Des. Vol. 21 (2000), p.311.

[17] R.Z. Valiev, T.G. Langdon: Progress in Materials Science Vol. 51 (2006), p.881.

[18] J. I Kim, Y. Liu, S. Miyazaki: Acta Mater. Vol. 52 (2004), p.487.

[19] C. Xie, Z. Fan: Mater. Sci. Forum Vol. 561-565 (2007), p.2313.

[20] I. karaman, H. ersin Karaca, H.J. Maier, et al: Metal and Mater. trans. Vol. 34A(11) (2003), p.2527.