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

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.

authors

• Karaman, Ibrahim

published proceedings

• SCRIPTA MATERIALIA

altmetric score

• 0.25

author list (cited authors)

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

citation count

• 37

complete list of authors

• Umale, Tejas||Salas, Daniel||Tomes, Bradley||Arroyave, Raymundo||Karaman, Ibrahim

publication date

• March 2019

publisher

• Elsevier  Publisher

published in

• Scripta Materialia  Journal

keywords

• Composition Dependence
• High Temperature Shape Memory Alloy
• Martensitic Phase Transformation
• NiTiHf

Digital Object Identifier (DOI)

• 10.1016/j.scriptamat.2018.10.008

start page

• 78

end page

• 83

volume

• 161

URL

• http://dx.doi.org/10.1016/j.scriptamat.2018.10.008