Introduction to Al Mg Sc Zr Alloy
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This paper systematically studies the Al-Mg-Sc-Zr alloy by combination of SLM and DED with emphasis on its bonding properties, microstructure, and metallurgical defects.
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In this study, an Al-Mg-Sc-Zr alloy fabricated through selective laser melting (SLM) was subjected to a single-stage heat-treatment process and a two-stage heat-treatment process to determine the effect of heat treatment on the tensile properties and fatigue properties of the alloy at room temperature and high temperatures.
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[18] investigated the effect of cold rolling on the microstructure and properties of the SLM Al-Mg-Sc-Zr alloy.
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However, the effect of heat treatments on the microstructure and mechanical properties of SLMed Al-Mg-Sc-Zr alloy is not fully understood and heat treatment needs to be optimized.
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After aging treatment, the distinction in microhardness of the samples obtained under different laser scanning speed is obviously reduced, and the mechanical properties of the samples are further improved with a maximum microhardness of 175 ± 5 HV and a maximum compressive yield strength of 476 ± 10 MPa, which are superior to the known Al-Mg-Sc-Zr alloy with same Sc and Zr content fabricated by SLM.
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Compressive strength of the Al-Mg-Sc-Zr alloy samples after HIP was also increased ~25%.
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The results show that the recrystallization and grain growth behavior of Al-Mg-Sc-Zr alloy can be inhibited effectively by microalloying with Sc and Zr.
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Additive manufacturing Al-Mg-Sc-Zr alloys offer significant advantages for lightweight application with complex shapes.
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