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Alloys, Volume 1, Issue 3
2022 December - 6 articles
Cover Story: Crack-free LPBF samples with a relative density of >99.9 % were processed from pre-alloyed AlMgSi1Zr (AA6182 series alloy) powder, to which 0.5 wt.-% Zr and 0.5 wt.-% Ti were added via mechanical mixing. No hot cracks were found in the µCT scans. Moreover, a fully equiaxed microstructure with a mean size of 1.2 µm for the Al grains was observed in the as-built parts. In TEM characterization, Al3(Zr,Ti) particles were observed, acting as efficient heterogeneous grain refiners for Al by building a semi-coherent interface. Unmolten Ti and Zr particles with sizes up to 80 µm were found in the Al phase. The resulting fine-grained microstructure led to a tensile strength of 329 ± 4 MPa and a total elongation at a break of 11.4 ± 0.9 % after solution heat treatment, quenching in water and subsequent artificial ageing. View this paper
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Alloys - ISSN 2674-063X