Elastocaloric effect with a broad temperature window and low energy loss in a nanograin Ti-44Ni-5Cu-1Al <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>(</mml:mo><mml:msub><mml:mrow><mml:mi>at</mml:mi></mml:mrow><mml:mo>·</mml:mo></mml:msub><mml:mo>%</mml:mo><mml:mo>)</mml:mo></mml:math> shape memory alloy
نویسندگان
چکیده
Superelastic Ti-Ni-based shape memory alloys are promising elastocaloric materials for solid-state refrigeration. In this paper, we studied the mechanical properties and effect of a severely cold rolled Ti-44Ni-5Cu-1Al (at.%) alloy composed nanograins $(\ensuremath{\sim}5\text{--}16\phantom{\rule{0.16em}{0ex}}\mathrm{nm})$. The exhibits partial stress-induced martensitic transformation with large quasilinear reversible strain $\ensuremath{\sim}3.4\phantom{\rule{0.16em}{0ex}}%$ small energy dissipation $\ensuremath{\sim}1.6\phantom{\rule{0.16em}{0ex}}\mathrm{MJ}/{\mathrm{m}}^{3}$ when maximum stress 1 GPa is applied. temperature decrease induced by adiabatic removal about \ensuremath{-}5 K, which mainly due to reverse transition occurring during unloading. effective working window larger than 200 K. coefficient performance reaches \ensuremath{\sim}13, higher values reported so far Ti-Ni alloys.
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ژورنال
عنوان ژورنال: Physical Review Materials
سال: 2021
ISSN: ['2476-0455', '2475-9953']
DOI: https://doi.org/10.1103/physrevmaterials.5.015201