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Anisotropic Negative Thermal Expansion Behavior of the As-Fabricated Ti-Rich and Equiatomic Ti–Ni Alloys Induced by Preferential Grain Orientation

  • SPECIAL ISSUE: SHAPE MEMORY AND SUPERELASTIC TECHNOLOGIES CONFERENCE 2017, INVITED PAPER
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Abstract

The present study focuses on the anisotropic negative thermal expansion (NTE) behaviors of Ti-rich (Ti54Ni46) and equiatomic Ti–Ni (Ti50Ni50) alloys fabricated by vacuum arc melting and without subsequent plastic deformation. Both alloys exhibit NTE responses in vertical and horizontal directions, and the total strains and CTEs of the NTE stage along the two mutually perpendicular measuring directions are obviously different, indicating obvious anisotropic NTE behavior of the alloys. Besides, the numerical differences between the starting temperature of NTE and austenitic transformation and between the finishing temperature of NTE and austenitic transformation are very small, which indicates that an apparent relationship exists between the NTE behavior and the phase transformation. The microstructure in the vertical cross sections shows obviously preferential orientation characteristics: Ti2Ni phases of both alloys grow along the vertical direction, and B19′ martensite of Ti50Ni50 alloy has distinct preferential orientation, which results from a large temperature gradient between the top and the bottom of the button ingots during solidification. The microstructure with preferential orientation induces the anisotropic NTE behavior of the samples.

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Acknowledgements

This study was supported by the National Natural Science Foundation of China under Grant Nos. 51571092 and 51401081, the Key Project Program of Guangdong Provincial Natural Science Foundation under Grant No. S2013020012805.

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Authors and Affiliations

  1. School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China

    Zhong-Xun Zhao, Xiao Ma, Shan-Shan Cao, Chang-Bo Ke & Xin-Ping Zhang

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  1. Zhong-Xun Zhao
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  2. Xiao Ma
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  3. Shan-Shan Cao
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Correspondence to Xiao Ma.

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Zhao, ZX., Ma, X., Cao, SS. et al. Anisotropic Negative Thermal Expansion Behavior of the As-Fabricated Ti-Rich and Equiatomic Ti–Ni Alloys Induced by Preferential Grain Orientation. Shap. Mem. Superelasticity 4, 218–223 (2018). https://doi.org/10.1007/s40830-017-0145-9

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  • DOI: https://doi.org/10.1007/s40830-017-0145-9

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