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Title: Tuning the temperature range of superelastic Ni-Ti alloys for elastocaloric cooling via thermal processing

Journal Article · · JPhys Energy

Abstract Caloric cooling enlisting solid-state refrigerants is potentially a promising eco-friendly alternative to conventional cooling based on vapor compression. The most common refrigerant materials for elastocaloric cooling to date are Ni-Ti based superelastic shape memory alloys. Here, we have explored tuning the operation temperature range of Ni 50.8 Ti 49.2 for elastocaloric cooling. In particular, we have studied the effect of thermal treatments (a.k.a. aging) on the transformation temperature, superelasticity, and elastocaloric effects of Ni 50.8 Ti 49.2 shape memory alloy tubes. The isothermal compressive test revealed that the residual strain of thermally-treated Ni-Ti tubes at room temperature approaches zero as aging time is increased. Short-time aging treatment at 400 °C resulted in good superelasticity and elastocaloric cooling performance with a large tunable austenite finish ( A f ) temperature range of 24.7 °C, as determined from the A f temperature of the samples that were aged 5–120 min. The main reason of the property change is the formation of a different amount of Ni 4 Ti 3 precipitates in the NiTi matrix. Our findings show that it is possible to tailor the A f temperature range for development of cascade elastocaloric cooling systems by thermally treating a starting single composition Ni-Ti alloy.

Sponsoring Organization:
USDOE
Grant/Contract Number:
EE0009159
OSTI ID:
1971947
Alternate ID(s):
OSTI ID: 2418073; OSTI ID: 1970083
Journal Information:
JPhys Energy, Journal Name: JPhys Energy Journal Issue: 2 Vol. 5; ISSN 2515-7655
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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  • Girsova, S. L.; Poletika, T. M.; Girsova, N. V.
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