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Simultaneous strength and ductility enhancements of high thermal conductive Ag7.5Cu alloy by selective laser melting
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Xiong, Wei, Hao, Liang, Peijs, Ton, Yan, Chunze, Cheng, Kaka, Gong, Ping, Cui, Qian, Tang, Danna, Al Islam, Shamoon and Li, Yan (2022) Simultaneous strength and ductility enhancements of high thermal conductive Ag7.5Cu alloy by selective laser melting. Scientific Reports, 12 (1). p. 4250. doi:10.1038/s41598-022-08182-4 ISSN 2045-2322.
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Official URL: https://doi.org/10.1038/s41598-022-08182-4
Abstract
High electrical and thermal conductive metals (HETCM) play a key role in smart electronics, green energy, modern communications and healthcare, however, typical HETCM (e.g., Ag, Au, Cu) usually have relatively low mechanical strength, hindering further applications. Selective laser melting (SLM) is a potentially transformative manufacturing technology that is expected to address the issue. Ag is the metal with the highest thermal conductivity, which induces microscale grain refinement, but also leads to high internal stresses by SLM. Here, we select Ag7.5Cu alloy as an example to demonstrate that multi-scale (micro/meso/macro) synergies can take advantage of high thermal conductivity and internal stresses to effectively strengthen Ag alloy. The mimicry of metal-hardened structures (e.g., large-angle boundary) is extended to the mesoscale by controlling the laser energy density and laser scanning strategy to manipulate the macroscale internal stress intensity and mesoscale internal stress direction, respectively, to form mesoscale large-angle "grains", resulting in multiple mutual perpendicular shear bands during fracture. The presented approach achieved a significant enhancement of yield strength (+ 145%) and ductility (+ 28%) without post-treatment. The results not only break the strength-ductility trade-off of conventional SLM alloys, but also demonstrate a multi-scale synergistic enhancement strategy that exploits high thermal conductivity and internal stresses.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||
| SWORD Depositor: | Library Publications Router | ||||||
| Journal or Publication Title: | Scientific Reports | ||||||
| Publisher: | Nature Publishing Group UK | ||||||
| ISSN: | 2045-2322 | ||||||
| Official Date: | 11 March 2022 | ||||||
| Dates: |
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| Volume: | 12 | ||||||
| Number: | 1 | ||||||
| Page Range: | p. 4250 | ||||||
| DOI: | 10.1038/s41598-022-08182-4 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||
| Date of first compliant deposit: | 14 November 2022 | ||||||
| Date of first compliant Open Access: | 14 November 2022 | ||||||
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