Abstract
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(△Tmax=16.3 K at ε=5％)and moderate COPmater values(maximum COPmater=11.8 at ε=2％)were achieved.The present nano-grained NiTi alloys exhibited great potential for applications as a highly efficient elastocaloric material.
基金项目
Science Fund of the Key Laboratory of Cryogenic Science and Technology(CRYO20230203)
Science Fund of the Key Laboratory of Cryogenic Science and Technology(CRYO202106)
国家自然科学基金(51872299)
国家自然科学基金(52071223)
国家重点研发计划(2019YFA0704904)
NETL
NSTL
万方数据