Elastocaloric effect in bamboo-grained Cu71.1Al17.2Mn11.7 microwires

• Published in: Journal of alloys and compounds Vol. 850; p. 156612
• Main Authors: Yuan, Bo, Zhong, Shijiang, Qian, Mingfang, Zhang, Xuexi, Geng, Lin
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 05.01.2021; Elsevier BV
• Subjects: Aluminum; Bamboo; Copper; Core loss; Cu–Al–Mn microwires; Elastocaloric effect (eCE); Grain boundaries; Manganese; Martensite; Martensitic transformation; Shape memory materials; Solid-state refrigeration; Superelasticity; Shape memory materials; Solid-state refrigeration; Martensitic transformation; Cu–Al–Mn microwires; Elastocaloric effect (eCE)
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2020.156612

Bamboo-grained Cu71.1Al17.2Mn11.7 microwires with diameter ∼150 μm were created by Taylor-Ulitovsky method and subsequent annealing. The grain architecture dependent superelasticity (SE) and elastocaloric effects (eCE) were confirmed. The bamboo-grained microwires exhibited low stress hysteresis loss during SE due to the reduced constraints caused by grain boundary, which is favorable for the mobility of martensite-austenite interface. Consequently, a large isothermal entropy change ∼21 J/kg K with a wide temperature range 90 K was achieved. The produced adiabatic temperature change (ΔTad) reached −11.9 K under a maximum stress 400 MPa. A stable ΔTad of −5.6 K showing little degradation in 200 eCE cycles was found with applied stress 325 MPa. This work reveals a fact that the bamboo-grained Cu–Al–Mn microwire may act as a desirable material for miniature solid-state refrigeration devices. [Display omitted] •Bamboo-grained Cu71.1Al17.2Mn11.7 microwires were successfully prepared with reduced stress hysteresis (∼40 MPa).•A large isothermal entropy change ∼21 J/kg K with a wide temperature range of 90 K was achieved.•A large reversible adiabatic temperature change ΔTad of −11.9 K was obtained at room temperature.•A stable ΔTad of −5.6 K showing no degradation in 200 elastocaloric cycles was achieved at room temperature.