Heterogeneities in solid-state additively manufactured 7075 aluminium alloy
(2023) Workshop on Friction Stir based processes — Location: IMMC - UCLouvain, 1348, Louvain-la-Neuve, Belgium (4.December.2023)
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- Authors
Sapanathan, Thaneshan 
- Abstract
- The solid-state AM process of Multi-Layer Friction Surfacing (MLFS) of high strength aluminum alloy 7075 leads to microstructure (grain size and precipitates size and distribution) and mechanical heterogeneities. The mean grain size and strengthening precipitates are significantly affected by the layered structure due to the complex thermal field. This thermal history through a thermal model that allows to better understand the effect of it on these microstructural heterogeneities. The precipitates size gradient along the thickness of the deposit causes the significantly higher microhardness of the top layer. Post-deposition heat treatments are used to restore the uniformly T6 state microhardness and to reach a strength above 500MPa and an elongation of typically 10%.
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Citations
Jadot, M., Li, J., Xie, J., Lezaack, M. B., Sapanathan, T., Rachik, M., & Simar, A. (2023). Heterogeneities in solid-state additively manufactured 7075 aluminium alloy. Workshop on Friction Stir based processes, IMMC - UCLouvain, 1348, Louvain-la-Neuve, Belgium. https://hdl.handle.net/2078.5/231391