Journal
SCIENCE
Volume 366, Issue 6469, Pages 1116-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aax7616
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Funding
- Advanced Research Projects Agency-Energy (ARPA-E) of the U.S. Department of Energy (DOE) [ARPA-E DEAR0000131]
- The use of the laser-engineered net shaping
- Critical Materials Institute, an Energy Innovation Hub - Advanced Manufacturing Office of the Office of Energy Efficiency and Renewable Energy of the DOE
- Division of Materials Science and Engineering of the Basic Energy Sciences Programs of the Office of Science of the DOE [DE-AC02-07CH11358]
- Iowa State University
- National Science Foundation [MMN-1904830]
- Los Alamos National Laboratory Additive Manufacturing Graduate Fellowship
- Alliance for the Development of Additive Processing Technologies (ADAPT)
- Army Research Office [W911NF-17-1-0225]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
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Elastocaloric cooling, a solid-state cooling technology, exploits the latent heat released and absorbed by stress-induced phase transformations. Hysteresis associated with transformation, however, is detrimental to efficient energy conversion and functional durability. We have created thermodynamically efficient, low-hysteresis elastocaloric cooling materials by means of additive manufacturing of nickel-titanium. The use of a localized molten environment and near-eutectic mixing of elemental powders has led to the formation of nanocomposite microstructures composed of a nickel-rich intermetallic compound interspersed among a binary alloy matrix. The microstructure allowed extremely small hysteresis in quasi-linear stress-strain behaviors-enhancing the materials efficiency by a factor of four to seven-and repeatable elastocaloric performance over 1 million cycles. Implementing additive manufacturing to elastocaloric cooling materials enables distinct microstructure control of high-performance metallic refrigerants with long fatigue life.
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