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Abstract:
In the present study, the reversible adiabatic temperature change (Delta T-ad) of shape memory alloys was shown to be proportional to the mechanical work released by the reverse martensitic transformation during unloading (Delta W-u). As there exists a considerable amount of data (Delta W-u) on superelastic stress-strain measurements in shape memory alloys, the proposed relationship allows us to predict Delta T-ad without caloric measurements. The estimated Delta T-ad from the Delta W-u of different Ti-Ni alloys shows good linear relationship with the directly measured values. Moreover, following such a design criterion and by tuning of composition and thermo-mechanical treatment, a group of Ti-Ni binary shape memory alloys with directly measured Delta T-ad larger than 35 K under tension were achieved. The large Delta T-ad and Delta W-u can be ascribed to the grain refinement and the heterogeneous internal stress fields after the thermo-mechanical treatment, which have enhanced the critical stress of superelasticity and recoverability of martensitic transformation during unloading. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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ACTA MATERIALIA
ISSN: 1359-6454
Year: 2021
Volume: 218
8 . 2 0 3
JCR@2020
ESI Discipline: MATERIALS SCIENCE;
ESI HC Threshold:36
CAS Journal Grade:1
Cited Count:
WoS CC Cited Count: 5
SCOPUS Cited Count: 16
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 2
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