Elastocaloric effect and mechanical behavior for NiTi shape memory alloys  

作　　者：Min Zhou Yu-Shuang Li Chen Zhang Lai-Feng Li 周敏;李玉霜;张晨;李来风(Key Laboratory of Cryogenics,Technical Institute of Physics and Chemistry Chinese Academy of Sciences;School of Materials Science and Engineering,Beihang University)

机构地区：[1]Key Laboratory of Cryogenics,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China [2]School of Materials Science and Engineering,Beihang University,Beijing 100191,China

出　　处：《Chinese Physics B》2018年第10期518-524,共7页中国物理B（英文版）

基　　金：Project supported by the Science Fund from the Key Laboratory of Cryogenics,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences(TIPC,CAS)(Grant Nos.CRYOQN201501 and CRYO201218);the National Natural Science Foundation of China(Grant Nos.51577185,51377156,and51408586)

摘　　要：The NiTi shape memory alloy exhibits excellent superelastic property and elastocaloric effect. The large temperature change（DT） value of 30 K upon loading and-19 K upon unloading are obtained at room temperature, which are higher than those of the other NiTi-based materials and among the highest values reported in the elastocaloric materials. The asymmetry of the measured DT values between the loading and unloading process is ascribed to the friction dissipation.The large temperature change originates from the large entropy change during the stress-induced martensite transformation（MT） and the reverse MT. A large coefficient-of-performance of the material is obtained to be 11.7 at ε= 1%, which decreases with increasing the applied strain. These results are very attractive in the present solid-state cooling, which potentially could replace the vapor compression refrigeration technologies.The NiTi shape memory alloy exhibits excellent superelastic property and elastocaloric effect. The large temperature change（DT） value of 30 K upon loading and-19 K upon unloading are obtained at room temperature, which are higher than those of the other NiTi-based materials and among the highest values reported in the elastocaloric materials. The asymmetry of the measured DT values between the loading and unloading process is ascribed to the friction dissipation.The large temperature change originates from the large entropy change during the stress-induced martensite transformation（MT） and the reverse MT. A large coefficient-of-performance of the material is obtained to be 11.7 at ε= 1%, which decreases with increasing the applied strain. These results are very attractive in the present solid-state cooling, which potentially could replace the vapor compression refrigeration technologies.

关 键 词：elastocaloric effect shape memory alloy martensitic transformation entropy change 

分 类 号：O414.13[理学—理论物理]