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DOE OSTI · 1813021

Nanocrystalline strain glass TiNiPt and its superelastic behavior

Jiang, Daqiang·An, Jiale·Liu, Yinong·Ma, Zhiyuan·Liu, Fangfeng·Yang, Hong·Ren, Xiaobing·Yu, Kaiyuan·Zhang, Junsong·Jiang, Xiaohua·Ren, Yang·Cui, Lishan
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Abstract

TiNi-based shape-memory alloys are known to exhibit a strain glass state under certain conditions, generally in the presence of high-density defects such as excess solute atoms or alloying elements, dislocations, and nanoprecipitates. In this paper, we report a strain glass transition in a nanocrystalline Ti 50 Ni 35 Pt 15 alloy. The nanocrystalline strain glass state is achieved by a combined effect of high-density grain boundaries and high concentration doping of Pt atoms in the B2 matrix. The nanocrystalline Ti 50 Ni 35 Pt 15 strain glass alloy showed a large near-complete progressive superelasticity with a recovery strain of about 6% and a low apparent Young's modulus of about 30 GPa in a wide temperature range of over 200 °C. In situ synchrotron x-ray diffraction measurement showed that the strain glass B2 [B2(SG)] phase experienced B2(SG)→R→B19 transformation upon loading and B19→B2(SG) upon unloading. The findings of this study provide insight for the development of nanocrystalline strain glass shape-memory alloys.

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75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITYMartensitic phase transformationNanocrystallineShape memory alloyStrain glassSuperelasticityTiNiPt

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Jiang, Daqiang, An, Jiale, Liu, Yinong, Ma, Zhiyuan, Liu, Fangfeng, Yang, Hong, Ren, Xiaobing, Yu, Kaiyuan, Zhang, Junsong, Jiang, Xiaohua, Ren, Yang, Cui, Lishan. 2021-07-06. Nanocrystalline strain glass TiNiPt and its superelastic behavior. https://doi.org/10.1103/physrevb.104.024102

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