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Simultaneous improvement of strength and ductility in selective laser melted low Sc content Al-Mg-Mn-Sc-Zr alloy via aging treatment

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Resumo:To improve the processability and mechanical properties of the selective laser melting (SLM) low Sc content Al-Mg-Sc-Zr alloy, Mn was used to partially replace Mg. The processability, microstructure, and mechanical properties of the SLM-fabricated Al-Mg-Mn-Sc-Zr alloy were systematically investigated by density measurement, microstructure characterization, and tensile testing. The results revealed that dense samples could be obtained by adjusting the SLM process parameters. The alloy exhibited a fine equiaxed-columnar bimodal grain microstructure. The presence of primary Al3Sc and α-Al(Mn,Fe)Si particles contributed to the grain refinement of the alloy with an average grain size of 4.63 μm. Upon aging treatment at 350 °C for 2 h, the strength and elongation of the alloy were simultaneously improved due to the precipitation of Al3Sc nanoparticles and the formation of the 9R phase. This study demonstrates that the strength-plasticity trade-off of the aluminum alloy can be overcome by utilizing SLM technology and subsequent post-heat treatment to induce the formation of the long-period stacked ordered phase.
Autores principais:CHEN, Yong-kang
Outros Autores:GENG, Yao-xiang; WANG, Xiao; SHAN, Zhi-fa; ZHANG, Zhi-jie; JU, Hong-bo
Assunto:selective laser melting; low Sc content Al-Mg-Mn-Sc-Zr alloy; 9R phase; Al3Sc nanoparticle; strength-plasticity trade-off
Ano:2025
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso embargado
Instituição associada:Universidade de Coimbra
Idioma:inglês
Origem:Estudo Geral - Universidade de Coimbra

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