Elastocaloric effect with small hysteresis in bamboo-grained Cu–Al–Mn microwires
- 46 Downloads
The elastocaloric effect in Cu–Al–Mn shape memory alloy microwires fabricated by Taylor–Ulitovsky method was investigated. The microwires with bamboo-like grain architecture, homogeneous composition and favorable orientation were successfully prepared through high-temperature annealing heat treatment. The formation of the bamboo grains and high specific surface area contribute to the reduced martensite transformation hysteresis. A large recoverable strain up to 8.8% was achieved by two-way shape memory cycling under a low stress of 50 MPa. Consequently, the microwire exhibited a large entropy change ΔSiso = 16.1 J kg−1 K−1. Furthermore, the refrigeration capacity (RC) reached ~ 502 J kg−1 over a working temperature interval ΔTFWHM = 31 K during direct transformation under 50 MPa uniaxial stress. Finally, a reversible adiabatic temperature change ΔTad = 3.9 K under a stress of 150 MPa was obtained. This proves that the present Cu–Al–Mn microwire, with bamboo grains, high refrigeration property and low cost, may act as promising candidate materials for elastocaloric cooling.
Financial supports from the National Key R&D Program of China (Grant No. 2017YFB0703103), the National Natural Science Foundation of China (NSFC) (Grant No. 51701052) and the Fundamental Research Funds for the Central Universities (Grant No. HIT.NSRIF.201801) are greatly acknowledged.
- 10.Tušek J, Engelbrecht K, Mikkelsen LP, Pryds N (2015) Elastocaloric effect of Ni–Ti wire for application in a cooling device. J Appl Phys 117:10–19Google Scholar
- 16.Xiao F, Fukuda T, Kakeshita T (2013) Significant elastocaloric effect in a Fe–31.2Pd (at.%) single crystal. Appl Phys Lett 102:4494Google Scholar
- 19.Lu B, Xiao F, Yan A, Liu J (2014) Elastocaloric effect in a textured polycrystalline Ni–Mn–In–Co metamagnetic shape memory alloy. Appl Phys Lett 105:439Google Scholar
- 35.Chen Y, Zhang XX, Dunand D, Schuh C (2009) Shape memory and superelasticity in polycrystalline Cu–Al–Ni microwires. Appl Phys Lett 95:25Google Scholar
- 43.Xie J, Liu J, Huang H (2015) Structure design of high-performance Cu-based shape memory alloys. Rare Met 346:07–24Google Scholar