Campus Units
Aerospace Engineering, Materials Science and Engineering, Mechanical Engineering, Ames Laboratory
Document Type
Article
Publication Version
Submitted Manuscript
Publication Date
8-21-2019
Journal or Book Title
arXiv
Abstract
Elastocaloric cooling, which exploits the latent heat released and absorbed as stress-induced phase transformations are reversibly cycled in shape memory alloys, has recently emerged as a frontrunner in non-vapor-compression cooling technologies. The intrinsically high thermodynamic efficiency of elastocaloric materials is limited only by work hysteresis. Here, we report on creating high-performance low-hysteresis elastocaloric cooling materials via additive manufacturing of Titanium-Nickel (Ti-Ni) alloys. Contrary to established knowledge of the physical metallurgy of Ti-Ni alloys, intermetallic phases are found to be beneficial to elastocaloric performances when they are combined with the binary Ti-Ni compound in nanocomposite configurations. The resulting microstructure gives rise to quasi-linear stress-strain behaviors with extremely small hysteresis, leading to enhancement in the materials efficiency by a factor of five. Furthermore, despite being composed of more than 50% intermetallic phases, the reversible, repeatable elastocaloric performance of this material is shown to be stable over one million cycles. This result opens the door for direct implementation of additive manufacturing to elastocaloric cooling systems where versatile design strategy enables both topology optimization of heat exchangers as well as unique microstructural control of metallic refrigerants.
Copyright Owner
The Authors
Copyright Date
2019
Language
en
File Format
application/pdf
Recommended Citation
Hou, Huilong; Simsek, Emrah; Ma, Tao; Johnson, Nathan S.; Qian, Suxin; Cissé, Cheikh; Stasak, Drew; Al Hasan, Naila; Zhou, Lin; Hwang, Yunho; Radermacher, Reinhard; Levitas, Valery I.; Kramer, Matthew J.; Zaeem, Mohsen Asle; Stebner, Aaron P.; Ott, Ryan T.; Cui, Jun; and Takeuchi, Ichiro, "Fatigue-resistant high-performance elastocaloric materials via additive manufacturing" (2019). Aerospace Engineering Publications. 150.
https://lib.dr.iastate.edu/aere_pubs/150
Comments
This is a pre-print of the article Hou, Huilong, Emrah Simsek, Tao Ma, Nathan S. Johnson, Suxin Qian, Cheikh Cisse, Drew Stasak, Naila Al Hasan, Lin Zhou, Yunho Hwang, Reinhard Radermacher, Valery I. Levitas, Matthew J. Kramer, Mohsen Asle Zaeem, Aaron P. Stebner, Ryan T. Ott, Jun Cui, and Ichiro Takeuchi. "Fatigue-resistant high-performance elastocaloric materials via additive manufacturing." arXiv preprint arXiv:1908.07900 (2019). Posted with permission.