Microstructures and Phase Transformations of Ti-50.9at%Ni Alloy Processed by Equal Channel Angular Extrusion at Medium Temperature

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Submicron-grained Ti-50.9at%Ni alloy was prepared by Equal Channel Angular Extrusion (ECAE) at medium temperature(500°C). Microstructure evolution and phase transformations of Ti-50.9at%Ni alloy after ECAE processes at medium temperature have been investigated by optical microscope, TEM and DSC tests. It is found that the initial coarse grains of Ti-50.9at%Ni alloy were refined into submicron grains, smaller than 0.5 um in size, after eight passes ECAE at 500°C. Martensitic transformation temperatures decreased remarkably after one pass ECAE and more gently with increasing the pass number of ECAE. R phase transformation was stimulated after ECAE processes and underwent within a larger temperature range with an ambiguous thermal peak. The reverse R phase and reverse martensitic transformations, during heating, were separated eventually after eight passes ECAE.

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Periodical:

Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee

Pages:

877-880

DOI:

10.4028/www.scientific.net/MSF.561-565.877

Citation:

C. Y. Xie and Z. G. Fan, "Microstructures and Phase Transformations of Ti-50.9at%Ni Alloy Processed by Equal Channel Angular Extrusion at Medium Temperature", Materials Science Forum, Vols. 561-565, pp. 877-880, 2007

Online since:

October 2007

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$35.00

[1] V.G. Pushin, V.V. Stolyarov, R.Z. Valiev, et al. Ann Chim Sci Mat, 2002: 27 (3): 77-88.

[2] V.G. Pushin, V.V. Stolyarov, R.Z. Valiev, et al. Mat Sci Eng A, 2005: 410-411: 386-389.

[3] V.G. Pushin, R.Z. Valiev, Y.T. Zhu, et al. Materials Science Forum, 2006: 503-504: 539-544.

[4] Zhenhua Li, Xianhua Cheng, Qianqian ShangGuan. Mater Letters, 2005: 59: 705-709.

[5] Zhenhua Li, Guoquan Xiang, Xianhua Cheng. Mater and Design, 2006: 27: 324-328.

[6] Xianhua Cheng, Zhenhua Li, Guoquan Xiang. Mater and Design, in press.

[7] I. Karaman, H. ersin Karaca, H.J. Maier, et al. Metal and Mater Trans, 2003: 34A: 11: 2527-239.

[8] B. Kockar, I. Karaman, A. Kulkarni, et al. Journal of Nuclear Materials, 2007: 361: 298-305.

[9] C.Y. Xie, Z.G. Fan. Materials Science Forum, 2006: 503-504: 1013-1018.

[10] J.I. Kim, Yinong Liu, S. Miyazaki. Acta Mater, 2004: 52: 487-499.

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