Temperature-dependence of superelastic stress in nanocrystalline NiTi with complete transformation capability

T. Wang, Z. Ma, X. Rao, D. Jiang, Y. Ren, Y. Liu, K. Y. Yu, L. Cui

Research output: Contribution to journalArticle

Abstract

Nanocrystalline (NC) NiTi were previously reported to obtain non-hysteretic superelasticity and nearly zero temperature-dependence of superelastic stresses. However, the influence of the non-transforming regions in the specimens was not ruled out. In this study, we fabricate NC NiTi specimens with grain size down to 15 nm by wire drawing and annealing. Our specimens have no detectable non-transforming regions and thus are of complete transformation capability. We demonstrate that the hysteretic superelasticity is observed in all specimens of different grain sizes and that the minimum temperature-dependence of superelastic stresses is 4.7 MPa/K. Possible reasons for the discrepancy have been discussed.

Original languageEnglish
Article number106970
JournalIntermetallics
Volume127
DOIs
Publication statusPublished - Dec 2020

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