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Title: Elastocaloric cooling of additive manufactured shape memory alloys with large latent heat

Journal Article · · Journal of Physics. D, Applied Physics
ORCiD logo [1];  [2]; ORCiD logo [1];  [1];  [3];  [2];  [4];  [1]
  1. Univ. of Maryland, College Park, MD (United States). Dept. of Materials Science and Engineering
  2. Ames Lab., Ames, IA (United States)
  3. Xi'an Jiaotong Univ., Xi'an (China). Dept. of Refrigeration and Cryogenic Engineering
  4. 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 Laboratory (AMES), Ames, IA (United States); Univ. of Maryland, College Park, MD (United States); Xi'an Jiaotong Univ., Xi'an (China)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Advanced Research Projects Agency - Energy (ARPA-E); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
AC02-07CH11358; AR0000131; 51606140
OSTI ID:
1407483
Report Number(s):
IS-J-9455; TRN: US1703151
Journal Information:
Journal of Physics. D, Applied Physics, Vol. 50, Issue 40; ISSN 0022-3727
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 64 works
Citation information provided by
Web of Science

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Cited By (7)

The influence of texture on the reversible elastocaloric effect of a polycrystalline Ni 50 Mn 32 In 16 Cr 2 alloy
  • Hernández-Navarro, Fernando; Camarillo-Garcia, Juan-Pablo; Aguilar-Ortiz, Christian-Omar
  • Applied Physics Letters, Vol. 112, Issue 16 https://doi.org/10.1063/1.5018732
journal April 2018
Characterization and modeling of elastocaloric effects of shape memory poly(cyclooctene) journal January 2019
Solid-state thermal energy storage using reversible martensitic transformations journal April 2019
Ultra-high fatigue life of NiTi cylinders for compression-based elastocaloric cooling journal August 2019
Accurate prediction of work and coefficient of performance of elastocaloric materials with phase transformation kinetics journal February 2018
A Short Review on the Microstructure, Transformation Behavior and Functional Properties of NiTi Shape Memory Alloys Fabricated by Selective Laser Melting journal September 2018
Solid-State Thermal Energy Storage Using Reversible Martensitic Transformations text January 2019