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Microstructure of selective laser melted AlSi10Mg alloy
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Tsinghua University, China.
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Number of Authors: 52019 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 168, article id 107677Article in journal (Refereed) Published
Abstract [en]

The influence of laser power during selective laser melting (SLM) on the grain morphology and texture component in AlSi10Mg alloy has been investigated, using electron backscattered diffraction (EBSD). Both equiaxed and columnar grainswere observed. The formation of equiaxed grainswas attributed to the huge thermal gradient on the border of melt pool and the columnar to equiaxed transition (CET) occurred in front of the columnar grains. The grain size of lowlaser power samplewas found smaller than that of higher ones. A fine pseudoeutectic structure, in which Si existed as fibrous, was observed because of the high cooling rate. This paper, from a new angle, explained the formations of three different zones across the melt pool, which were differentiated by the morphology of Si phase. The three zones correspond to the three temperature zones, whichwere divided by liquidus and solidus temperature, during the heating by laser beam. The coarse zones are formed by reheating the basic metal to semi-solid state when the temperature is lower than the liquidus temperature but higher than the solidus temperature.

Place, publisher, year, edition, pages
2019. Vol. 168, article id 107677
Keywords [en]
AlSi10Mg alloy, Selective laser melting, Grains morphology, Al-Si pseudoeutectic, Semi-solid state
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-167559DOI: 10.1016/j.matdes.2019.107677ISI: 000460664500025OAI: oai:DiVA.org:su-167559DiVA, id: diva2:1302968
Available from: 2019-04-08 Created: 2019-04-08 Last updated: 2019-04-08Bibliographically approved

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