Abnormal grain growth of 68Cu–16Al–16Zn alloys for elastocaloric cooling via cyclical heat treatments
Abstract
Abstract Cu-based superelastic shape memory alloys are promising for low-stress elastocaloric cooling. We have synthesized bulk alloys of 68Cu-16Al-16Zn under different conditions in order to promote its grain growth and enhance its elastocaloric properties. High-temperature X-ray diffraction of untreated 68Cu-16Al-16Zn alloy showed that the phase boundary between the α+β mixed phases and the high temperature phase (β phase) was between 973 K and 1023 K. Based on this result, the 68Cu-16Al-16Zn alloy was heated and cooled in a furnace repeatedly between 773 K and 1173 K. The maximum grain size after heat treatment of the ingot rolled to 67% reached 11.1 mm. The latent heat of the martensitic transformation after grain growth was 6.3 J g -1 , which is higher than the previously reported value for the compound. The stress-strain curve of 68Cu-16Al-16Zn rolled to 67% rolling with cyclical heat treatments showed a maximum stress of 106 MPa at 4.5% strain, with adiabatic temperature change of 5.9 K in heating during stress loading and 5.6 K in cooling in stress removal. Furthermore, no fatigue in the stress-strain behavior was observed up to at least 60,000 mechanical cycles at 2% strain. These properties of the large grain 68Cu-16Al-16Zn alloys aremore »
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1967524
- Alternate Identifier(s):
- OSTI ID: 1962439
- Grant/Contract Number:
- EE0009159
- Resource Type:
- Published Article
- Journal Name:
- JPhys Energy
- Additional Journal Information:
- Journal Name: JPhys Energy Journal Volume: 5 Journal Issue: 2; Journal ID: ISSN 2515-7655
- Publisher:
- IOP Publishing
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Kawarada, Yuya, Aimi, Akihisa, Santos, Abimael, Nakata, Gentaro, Takeuchi, Ichiro, and Fujimoto, Kenjiro. Abnormal grain growth of 68Cu–16Al–16Zn alloys for elastocaloric cooling via cyclical heat treatments. United Kingdom: N. p., 2023.
Web. doi:10.1088/2515-7655/acc5b2.
Kawarada, Yuya, Aimi, Akihisa, Santos, Abimael, Nakata, Gentaro, Takeuchi, Ichiro, & Fujimoto, Kenjiro. Abnormal grain growth of 68Cu–16Al–16Zn alloys for elastocaloric cooling via cyclical heat treatments. United Kingdom. https://doi.org/10.1088/2515-7655/acc5b2
Kawarada, Yuya, Aimi, Akihisa, Santos, Abimael, Nakata, Gentaro, Takeuchi, Ichiro, and Fujimoto, Kenjiro. Fri .
"Abnormal grain growth of 68Cu–16Al–16Zn alloys for elastocaloric cooling via cyclical heat treatments". United Kingdom. https://doi.org/10.1088/2515-7655/acc5b2.
@article{osti_1967524,
title = {Abnormal grain growth of 68Cu–16Al–16Zn alloys for elastocaloric cooling via cyclical heat treatments},
author = {Kawarada, Yuya and Aimi, Akihisa and Santos, Abimael and Nakata, Gentaro and Takeuchi, Ichiro and Fujimoto, Kenjiro},
abstractNote = {Abstract Cu-based superelastic shape memory alloys are promising for low-stress elastocaloric cooling. We have synthesized bulk alloys of 68Cu-16Al-16Zn under different conditions in order to promote its grain growth and enhance its elastocaloric properties. High-temperature X-ray diffraction of untreated 68Cu-16Al-16Zn alloy showed that the phase boundary between the α+β mixed phases and the high temperature phase (β phase) was between 973 K and 1023 K. Based on this result, the 68Cu-16Al-16Zn alloy was heated and cooled in a furnace repeatedly between 773 K and 1173 K. The maximum grain size after heat treatment of the ingot rolled to 67% reached 11.1 mm. The latent heat of the martensitic transformation after grain growth was 6.3 J g -1 , which is higher than the previously reported value for the compound. The stress-strain curve of 68Cu-16Al-16Zn rolled to 67% rolling with cyclical heat treatments showed a maximum stress of 106 MPa at 4.5% strain, with adiabatic temperature change of 5.9 K in heating during stress loading and 5.6 K in cooling in stress removal. Furthermore, no fatigue in the stress-strain behavior was observed up to at least 60,000 mechanical cycles at 2% strain. These properties of the large grain 68Cu-16Al-16Zn alloys are very attractive for implementing them in elastocaloric cooling devices.},
doi = {10.1088/2515-7655/acc5b2},
journal = {JPhys Energy},
number = 2,
volume = 5,
place = {United Kingdom},
year = {Fri Mar 31 00:00:00 EDT 2023},
month = {Fri Mar 31 00:00:00 EDT 2023}
}
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