Enhanced elastocaloric effect and specific adiabatic temperature variation in Ni-Mn-In-Si-Cu shape memory alloys

In this work, we demonstrate a giant elastocaloric effect in a Ni50Mn33In14Si1Cu2 alloy. Owing to the large transformation entropy change and low thermal hysteresis, giant adiabatic temperature change (ΔTad) of − 18.2 K is obtained on unloading from a maximum compressive strain of 6 % with a low str...

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Bibliographic Details
Published in:Journal of alloys and compounds 2022-11, Vol.920, p.165955, Article 165955
Main Authors: Li, Zhenzhuang, Li, Zongbin, Lu, Yunzhuo, Lu, Xing, Zuo, Liang
Format: Article
Language:English
Subjects:
Adiabatic flow
Compressive properties
Copper
Heat of transformation
Manganese
Martensitic transformations
Shape memory alloys
Superelasticity
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Summary:In this work, we demonstrate a giant elastocaloric effect in a Ni50Mn33In14Si1Cu2 alloy. Owing to the large transformation entropy change and low thermal hysteresis, giant adiabatic temperature change (ΔTad) of − 18.2 K is obtained on unloading from a maximum compressive strain of 6 % with a low stress of 145 MPa. Moreover, large specific adiabatic temperature variation (ΔTad/σmax) up to 126 K/GPa has been achieved. This ΔTad/σmax value significantly exceeds those in the typical shape memory alloys. The present results demonstrate that the target alloy exhibits a distinct advantage in the strength of elastocaloric effect, being crucial for practical applications of solid-state refrigeration. In addition, it is found that the cyclic stability can be effectively enhanced by one-step overstress superelastic training for the first cycle.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2022.165955