Effect of Ni/Ti Ratio and Ta Content on NiTiTa Alloys

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)491–502
Number of pages12
Journal / PublicationShape Memory and Superelasticity
Volume7
Issue number4
Online published2 Sep 2021
Publication statusPublished - Dec 2021

Abstract

Influences of Ta and Ni/Ti ratio on transformation temperatures, microstructures, and super-elastic properties of NiTiTa alloys were investigated. It is found that: (1) increasing Ni/Ti ratio increases the solubility limit of Ta in NiTi matrix and suppresses the formation of Ta-rich secondary phases. 4 at.% Ta can be dissolved in alloys with Ni/Ti ratio of ~ 1.1; (2) high Ni/Ti ratio promotes the formation of Ti2Ni3 phase, which is suppressed by increasing Ta additions; (3) phase transformation temperatures increase with Ta content at a rate of ~ 70–80 °C/at.% Ta, but rapidly decrease with increasing Ni/Ti ratio; (4) super-elastic properties of NiTiTa alloys can be optimized by adjusting residual cold work, Ta content, and Ni/Ti ratio; and finally, (5) phase transformation temperatures of NiTiTa alloys decrease with increasing valence electron concentration in general.

Research Area(s)

  • Ni/Ti ratio, NiTiTa alloys, Superelasticity, Synchrotron X-ray diffraction, Ta solubility

Citation Format(s)

Effect of Ni/Ti Ratio and Ta Content on NiTiTa Alloys. / Cai, S.; Schaffer, J. E.; Ren, Y.

In: Shape Memory and Superelasticity, Vol. 7, No. 4, 12.2021, p. 491–502.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review