The effects of wide range of compositional changes on the martensitic transformation characteristics of NiTiHf shape memory alloys Academic Article uri icon

abstract

  • © 2018 Acta Materialia Inc. The effects of composition on the martensitic transformation characteristics of NiTiHf shape memory alloys are systematically explored. Transformation temperatures (TTs) demonstrate a non-monotonic dependence on Ni and Hf concentrations. For Ni > 50 at%, TTs decrease with small Hf additions, attain a minimum or are completely suppressed, depending on Ni content, followed by a significant increase with Hf content. This initial drop in TTs becomes more pronounced with higher Ni contents and is attributed to the increase in nickel anti-site defects along with bulky substitutional Hf contributing to the increase in local lattice distortions along with the re-distribution of Ti and Hf.

altmetric score

  • 0.25

author list (cited authors)

  • Umale, T., Salas, D., Tomes, B., Arroyave, R., & Karaman, I.

citation count

  • 21

publication date

  • March 2019