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In situ alloying and reinforcing of Al6061 during selective laser melting

Journal Contribution - Journal Article Conference Contribution

This work investigates the feasibility of a novel method to simultaneously alloy and reinforce a low alloyed Al alloy (i.e., Al6061) during selective laser melting (SLM) via in situ decomposition of zinc oxide (ZnO). Based on Gibbs free energy calculations, an Al6061+6wt%ZnO powder mixture is designed and prepared. The thermal decomposition of ZnO, resulting in the formation of Al oxide and free Zn, necessitates a completely different set of optimised SLM parameters compared to traditional Al alloys. After SLM, it is shown that this method can successfully reinforce the Al matrix with numerous nanometer sized oxide particles (typically ~ 50-120 nm). Despite this clear success to manufacture in situ reinforced Al composites by SLM, the applied method could not avoid partial Zn evaporation (limiting in situ alloying) and could not successfully suppress the cracking that also occurs after SLM of unreinforced Al6061.
Journal: Procedia CIRP
ISSN: 2212-8271
Volume: 74
Pages: 39 - 43
Publication year:2018
BOF-keylabel:yes
IOF-keylabel:yes
Authors from:Government, Higher Education
Accessibility:Open