Effect of aging temperature on microstructure and mechanical properties of high-strength AlSiMg1.4 alloy fabricated by selective laser melting

被引：0
|
作者：
Geng Y.-X. [1 ]
Fan S.-M. [2 ]
Li J. [3 ]
Xu J.-H. [1 ]
Zhang Z.-J. [1 ]
Ju H.-B. [1 ]
Yu L.-H. [1 ]
机构：
[1] School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang
[2] Chongqing Changzheng Heavy Industry Co., Ltd., Chongqing
[3] XEMC Winpower Co., Ltd., Xiangtan
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2022年 / 32卷 / 10期
基金：
中国国家自然科学基金;
关键词：
AlSiMg1.4; alloy; Anisotropy; Mechanical properties; Microstructure; Selective laser melting;
D O I：
10.11817/j.ysxb.1004.0609.2021-42141
中图分类号：
学科分类号：
摘要：
In this work, the influence of aging temperature on microstructure and mechanical properties of SLM deposited high Mg-content AlSiMg1.4 alloy was systematically studied. The results show that the SLM deposited sample has a typical molten pool structure, in which the columnar grains penetrate the molten pool and the equiaxed grains exist in the molten pool boundary. The cellular substructure exists in the grains. The increase of Mg content in the sample effectively improves the solid solution of Mg in α(Al) matrix, which is conducive to the formation of Mg-Si clusters in SLM deposited samples and the precipitation of Mg-Si strengthening phases in direct aging samples, and thus effectively improves the strength of the alloy. After being aged at 150 ℃ for 2 h, the yield strength (σ0.2) and tensile strength (σb) of the samples are over 320 MPa and 530 MPa, respectively, which are higher than those of the most of the known Al-Si-Mg alloys fabricated by the SLM technique. Due to the different distribution and size of cellular substructure in different deposition directions, the as-deposited and 150 ℃ aging samples have obvious mechanical property anisotropy. When the aging temperature increases to 300 ℃ and 400 ℃, the anisotropy of mechanical properties of the samples with different deposition directions disappears due to the decomposition of cellular substructure. In this case, the strength of the samples decreases significantly, and the elongation increases greatly. © 2022, China Science Publishing & Media Ltd. All right reserved.
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页码：2897 / 2908
页数：11
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