Journal
COMPUTATIONAL MATERIALS SCIENCE
Volume 183, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.commatsci.2020.109808
Keywords
Elastocaloric effect; Shape memory alloy; Phase-field modeling; Functional fatigue; Adiabatic temperature changes
Categories
Funding
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DESC0019279]
- Extreme Science and Engineering Discovery Environment (XSEDE)
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The reversible stress-induced phase transformation in shape memory alloys (SMAs) is a dissipative process during which heat is absorbed or released. The inherent temperature variations inside the material has an elastocaloric effect (eCE) with appealing applications in solid-state cooling technology such as compact and efficient on-board refrigeration system for eletronic devices. In this manuscript, we conduct the first study of eCE of CuAlBe SMAs utilizing phase-field modeling. For an applied stress of 500 MPa, the results for polycrystalline Cu-Al11-2Be (at. %) show a minimum adiabatic unloading temperature change of -10 K over a pseudoelastic window of 40 K. In the absence of plastic deformation, the material demonstrates good reproducibility of the eCE over a few loading-unloading cycles. The presence of plastic deformation is found to cause functional fatigue that deteriorates the cooling capacity; however, the coefficient of performance only decreases from 9.04 to 8.03, which is still a very good value. These results place CuAlBe as a frontrunner SMA for solid-state cooling compared to the expensive NiTi.
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