Abstract

The effects of process parameters and aging treatment on the microstructure and mechanical properties of selective laser melting (SLM) fabricated high Mg-content Al-Mg-Sc-Zr aluminum alloy were systematically studied. Our experiment results show that the samples exhibit good processability with porosity less than 1%. The increase of Mg content in Al-Mg-Sc-Zr is beneficial to reduce the texture of the alloy. The laser scanning speed has a large influence on the Vickers hardness of as-fabricated samples. The maximum microhardness of as-fabricated sample reaches 148 ± 2 HV with a compression yield strength of 342 ± 7 MPa. 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. In this study, a novel high Mg-content Al-Mg-Sc-Zr aluminum alloy specifically for SLM with good processability and mechanical properties was reported.

Graphic Abstract

中文翻译：

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选择性激光熔炼制备高镁含量Al-Mg-Sc-Zr合金的力学性能

摘要

系统地研究了工艺参数和时效处理对高含镁量Al-Mg-Sc-Zr铝合金选择性激光熔炼（SLM）组织和力学性能的影响。我们的实验结果表明，样品具有良好的可加工性，孔隙率小于1％。Al-Mg-Sc-Zr中Mg含量的增加有利于降低合金的织构。激光扫描速度对制成样品的维氏硬度有很大的影响。加工后样品的最大显微硬度达到148±2 HV，压缩屈服强度为342±7 MPa。经过时效处理后，在不同的激光扫描速度下获得的样品的显微硬度差异明显减小，样品的机械性能得到进一步改善，最大显微硬度为175±5 HV，最大压缩屈服强度为476±10 MPa，优于已知的具有相同Sc和Zr的Al-Mg-Sc-Zr合金SLM制作的内容。在这项研究中，报道了一种新型的高镁含量的Al-Mg-Sc-Zr铝合金，专门用于SLM，具有良好的可加工性和机械性能。

图形摘要