Enhanced superelasticity and reversible elastocaloric effect in nano-grained NiTi alloys with low stress hysteresis  

作　　者：周敏 王维 苏浩健 胡忠军 李来风 Min Zhou;Wei Wang;Haojian Su;Zhongjun Hu;Laifeng Li(Key Laboratory of Cryogenic Science and Technology,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[1]Key Laboratory of Cryogenic Science and Technology,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China [2]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Chinese Physics B》2024年第5期557-562,共6页中国物理B（英文版）

基　　金：Project supported by the Science Fund of the Key Laboratory of Cryogenic Science and Technology(Grant Nos.CRYO20230203 and CRYO202106);the National Natural Science Foundation of China(Grant Nos.51872299 and 52071223);the National Key Research and Development Program of China(Grant No.2019YFA0704904)。

摘　　要：Solid-state cooling technologies have been considered as potential alternatives for vapor compression cooling systems.The search for refrigeration materials displaying a unique combination of pronounced caloric effect,low hysteresis,and high reversibility on phase transformation was very active in recent years.Here,we achieved increase in the elastocaloric reversibility and decrease in the friction dissipation of martensite transformations in the superelastic nano-grained NiTi alloys obtained by cold rolling and annealing treatment,with very low stress hysteresis(6.3 MPa)under a large applied strain(5%).Large adiabatic temperature changes(△T_(max)=16.3 K atε=5%)and moderate COP_(mater)values(maximum COP_(mater)=11.8 atε=2%)were achieved.The present nano-grained NiTi alloys exhibited great potential for applications as a highly efficient elastocaloric material.

关 键 词：elastocaloric effect stress hysteresis SUPERELASTICITY NiTi alloy 

分 类 号：TG146.15[一般工业技术—材料科学与工程]