Improvement of the stability of superelasticity and elastocaloric effect of a Ni-rich Ti-Ni alloy by precipitation and grain refinement

In this paper, we report that the superelasticity and the elastocaloric effect of Ti-50.8Ni (at.%) alloy are drastically improved by a combination of precipitation and grain refinement strengthening. The process is as follows: first, aging at 773 K after solution treatment to form coherent fine prec...

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Bibliographic Details
Published inScripta materialia Vol. 162; pp. 230 - 234
Main Authors Chen, Hong, Xiao, Fei, Liang, Xiao, Li, Zhenxing, Li, Zhu, Jin, Xuejun, Min, Na, Fukuda, Takashi
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.03.2019
Subjects
Elastocaloric effect
Shape memory alloys
Superelasticity
Thermomechanical treatment
Ti-Ni
Ti-Ni
Shape memory alloys
Superelasticity
Elastocaloric effect
Thermomechanical treatment
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Summary:In this paper, we report that the superelasticity and the elastocaloric effect of Ti-50.8Ni (at.%) alloy are drastically improved by a combination of precipitation and grain refinement strengthening. The process is as follows: first, aging at 773 K after solution treatment to form coherent fine precipitate of Ti3Ni4; second, cold working followed by annealing at 673 K to form nanocrystalline grain containing Ti3Ni4. The decay of the superelasticity and the elastocaloric effect by 100 stress cycles is <10%. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2018.11.024