工艺参数和时效处理对选区激光熔化AlSi8Mg3合金组织和力学性能的影响

耿遥祥; 唐浩; 许俊华; 侯裕; 王宇鑫; 何震; 张志杰; 鞠洪博; 喻利花

doi:10.1007/s12613-021-2287-1

Volume 29 Issue 9

Sep. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(9): 1770-1779

Yaoxiang Geng, Hao Tang, Junhua Xu, Yu Hou, Yuxin Wang, Zhen He, Zhijie Zhang, Hongbo Ju, and Lihua Yu, Influence of process parameters and aging treatment on the microstructure and mechanical properties of AlSi8Mg3 alloy fabricated by selective laser melting, Int. J. Miner. Metall. Mater., 29(2022), No. 9, pp. 1770-1779. https://doi.org/10.1007/s12613-021-2287-1

Cite this article as:

Yaoxiang Geng, Hao Tang, Junhua Xu, Yu Hou, Yuxin Wang, Zhen He, Zhijie Zhang, Hongbo Ju, and Lihua Yu, Influence of process parameters and aging treatment on the microstructure and mechanical properties of AlSi8Mg3 alloy fabricated by selective laser melting, Int. J. Miner. Metall. Mater., 29(2022), No. 9, pp. 1770-1779. https://doi.org/10.1007/s12613-021-2287-1

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研究论文

工艺参数和时效处理对选区激光熔化AlSi8Mg3合金组织和力学性能的影响

江苏科技大学材料科学与工程学院，镇江 212003，中国

通讯作者:
耿遥祥 E-mail: yaoxianggeng@163.com

王宇鑫 E-mail: ywan943@163.com

文章亮点

(1) 系统地研究了工艺参数和时效处理对选区激光熔化高Mg含量AlSi8Mg3合金组织和力学性能的影响。

(2) 开发了成形性和力学性能优异的SLM专用Al–Si–Mg合金并研究了其强化机理。

(3) 分析了不同工艺参数和时效条件下合金的组织演化过程。

中文摘要

选区激光熔化（SLM）技术可实现复杂金属零部件的直接近净成形，在航空航天等领域具有广阔的应用空间，然而目前SLM成形Al–Si–Mg合金主要基于传统铸造合金成分，强度较低，缺乏针对SLM技术熔体急冷特点的专用Al–Si–Mg合金新成分的设计。基于此，本研究针对SLM的技术特点，通过增加合金中镁元素的含量，设计了SLM专用高镁含量AlSi8Mg3合金新成分，并系统研究了工艺参数和时效处理对选区激光熔化AlSi8Mg3合金组织和力学性能的影响。结果表明，AlSi8Mg3样品具有良好的SLM加工性能，合金的最低孔隙率为0.07%。在高激光功率（190 W）下制备的样品中，由于在SLM加工过程中高强度本征热处理导致Mg₂Si纳米粒子从α-Al基体中析出，使得样品具有较高的Vickers硬度。样品的最大显微硬度和压缩屈服强度分别达到HV（211 ± 4）和（526 ± 12）MPa。经150°C时效处理后，由于纳米析出相数量的增多，样品的最大显微硬度和压缩屈服强度分别提高到HV（221 ± 4）和（577 ± 5）MPa，远高于目前已知大多数SLM成形的铝合金。本研究为优化SLM成形Al–Si–Mg合金的力学性能提供了新的思路。

关键词:

Research Article

Influence of process parameters and aging treatment on the microstructure and mechanical properties of AlSi8Mg3 alloy fabricated by selective laser melting

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Abstract

Abstract

Many studies have investigated the selective laser melting (SLM) of AlSi10Mg and AlSi7Mg alloys, but there are still lack of researches focused on Al–Si–Mg alloys specifically tailored for SLM. In this work, a novel high Mg-content AlSi8Mg3 alloy was specifically designed for SLM. The results showed that this new alloy exhibited excellent SLM processability with a lowest porosity of 0.07%. Massive lattice distortion led to a high Vickers hardness in samples fabricated at a high laser power due to the precipitation of Mg₂Si nanoparticles from the α-Al matrix induced by high-intensity intrinsic heat treatment during SLM. The maximum microhardness and compressive yield strength of the alloy reached HV (211 ± 4) and (526 ± 12) MPa, respectively. After aging treatment at 150°C, the maximum microhardness and compressive yield strength of the samples were further improved to HV (221 ± 4) and (577 ± 5) MPa, respectively. These values are higher than those of most known aluminum alloys fabricated by SLM. This paper provides a new idea for optimizing the mechanical properties of Al–Si–Mg alloys fabricated using SLM.
- AlSi8Mg3 alloy;
- selective laser melting;
- process parameters;
- microstructure;
- aging treatment;
- mechanical properties

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