Elastocaloric cooling of additive manufactured shape memory alloys with large latent heat
Journal Article
·
· Journal of Physics. D, Applied Physics
- Univ. of Maryland, College Park, MD (United States). Dept. of Materials Science and Engineering
- Ames Lab., Ames, IA (United States)
- Xi'an Jiaotong Univ., Xi'an (China). Dept. of Refrigeration and Cryogenic Engineering
- Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Materials Science and Engineering
The stress-induced martensitic phase transformation of shape memory alloys (SMAs) is the basis for elastocaloric cooling. In this paper, we employ additive manufacturing to fabricate TiNi SMAs, and demonstrate compressive elastocaloric cooling in the TiNi rods with transformation latent heat as large as 20 J g-1. Adiabatic compression on as-fabricated TiNi displays cooling ΔT as high as -7.5 °C with recoverable superelastic strain up to 5%. Unlike conventional SMAs, additive manufactured TiNi SMAs exhibit linear superelasticity with narrow hysteresis in stress–strain curves under both adiabatic and isothermal conditions. Microstructurally, we find that there are Ti2Ni precipitates typically one micron in size with a large aspect ratio enclosing the TiNi matrix. Finally, a stress transfer mechanism between reversible phase transformation in the TiNi matrix and mechanical deformation in Ti2Ni precipitates is believed to be the origin of the unique superelasticity behavior.
- Research Organization:
- Ames Lab., Ames, IA (United States); Univ. of Maryland, College Park, MD (United States); Xi'an Jiaotong Univ., Xi'an (China)
- Sponsoring Organization:
- National Natural Science Foundation of China (NSFC); USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office (EE-5A); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC02-07CH11358; AR0000131
- OSTI ID:
- 1407483
- Alternate ID(s):
- OSTI ID: 22665126
- Report Number(s):
- IS-J--9455
- Journal Information:
- Journal of Physics. D, Applied Physics, Journal Name: Journal of Physics. D, Applied Physics Journal Issue: 40 Vol. 50; ISSN 0022-3727
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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