High-strain induced reverse martensitic transformation in an ultrafine-grained 
Ti–Nb–Ta–Zr alloy

Li, Zhiming; Zheng, Baolong; Kurmanaeva, Lilia R.; Zhou, Yizhang Z.; Valiev, Ruslan Z.; Lavernia, Enrique J.

doi:10.1080/09500839.2016.1189098

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High-strain induced reverse martensitic transformation in an ultrafine-grained Ti–Nb–Ta–Zr alloy

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Li, Zhiming
Adaptive Structural Materials (Experiment), Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Department of Chemical Engineering and Materials Science, University of California, Davis, Davis, CA, USA;

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Citation

Li, Z., Zheng, B., Kurmanaeva, L. R., Zhou, Y. Z., Valiev, R. Z., & Lavernia, E. J. (2016). High-strain induced reverse martensitic transformation in an ultrafine-grained Ti–Nb–Ta–Zr alloy. Philosophical Magazine Letters, 96(5), 189-195. doi:10.1080/09500839.2016.1189098.

Cite as: https://hdl.handle.net/21.11116/0000-0001-B979-7

Abstract

We report on a novel phenomenon, that is a high-strain-induced reverse martensitic transformation in an ultrafine-grained Ti–36Nb–2Ta–3Zr (wt.) alloy processed by equal channel angular pressing (ECAP) at room temperature. Our results show that a martensitic transformation from body-centred cubic β matrix to orthorhombic α″ martensite occurs under low-strain ECAP conditions and that a large portion (~34) of martensite transforms into a matrix phase (i.e. reverse martensitic transformation) with increasing ECAP strain to a high value of 4 (i.e. 6 passes) with a corresponding reduction in the α″-lath thickness and a refinement of grain size in the matrix phase. © 2016 Informa UK Limited.