Strain variation during the isothermal martensitic transformation in Ti40.7Hf9.5Ni44.8Cu5 alloy

•Isothermal martensite transition under the stress was accompanied by strain rise.•The strain εiso increased up to saturation with time during isothermal holding.•The maximum of εiso was 2.9% and found when holding temperature T* was 50 °C.•Shift of the T* from the 50 °C led to a decrease in the max...

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Bibliographic Details
Published in:Materials letters 2019-11, Vol.254, p.266-268
Main Authors: Demidova, Elena, Belyaev, Sergey, Resnina, Natalia, Shelyakov, Alexander
Format: Article
Language:English
Subjects:
Functional properties
Isothermal strain variation
Martensitic transformations
Materials science
Nickel base alloys
Nickel compounds
Phase transformation
Shape memory alloys
Thin films
Titanium compounds
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Summary:•Isothermal martensite transition under the stress was accompanied by strain rise.•The strain εiso increased up to saturation with time during isothermal holding.•The maximum of εiso was 2.9% and found when holding temperature T* was 50 °C.•Shift of the T* from the 50 °C led to a decrease in the maximum value of εiso. The aim of the paper was to study the strain variation during the isothermal B2 → B19′ transformation in NiTi-based alloy. It was found that isothermal holding of the Ti40.7Hf9.5Ni44.8Cu5 alloy under a stress of 235 MPa at constant temperatures, which were close to the start temperature of the B2 → B19′ transition, was accompanied by an additional strain variation. This strain was completely reversible on further heating and depended on the position of the holding temperature compared to the start temperature of the forward transformation. The maximum of isothermal strain of 2.9% was observed during holding at a temperature of 50 °C.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2019.07.077