Effect of Heat Treatment on the Anisotropic Mechanical Properties of AlSi10Mg Fabricated by Selective Laser Melting

IF 2.2 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Engineering and Performance Pub Date : 2023-09-06 DOI:10.1007/s11665-023-08669-9

Shijun Xu, Qinghua Lu, Yangling Ou, Peilei Zhang, Hua Yan, Tianzhu Sun, Songyun Ma, Zhirong Luo, Yingtao Tian

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Abstract

In this paper, the effect of heat treatment on the anisotropic mechanical properties of AlSi10Mg formed by selective laser melting (SLM) was studied. AlSil0Mg alloy samples were formed by SLM horizontal and vertical orientation, and T6 heat treatment was performed on the samples. The phase composition, metallographic structure and fracture morphology of the samples were characterized, and the hardness and tensile properties were tested. Results show that the microstructure is obviously homogenized after heat treatment. The morphology of eutectic Si phase changes from the original network structure to irregular block and granular. For AlSi10Mg alloy formed by SLM with different orientations, the anisotropy of strength is quite different (>10%). The anisotropy of hardness is not obvious, and the strength and plasticity of the horizontal orientation forming sample are better. The strength of the samples formed in different orientations decreases and the plasticity increases after heat treatment. The strength anisotropy of different orientations is significantly reduced (<10%). Before heat treatment, the tensile fracture of AlSi10Mg alloy with different orientations is brittle fracture. The fracture morphology is mainly characterized by step and tear distribution. After heat treatment, the tensile fracture is ductile fracture. The fracture morphologies of vertical orientation and horizontal orientation are equiaxed dimples and shear dimples, respectively.

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热处理对选择性激光熔融法制造的 AlSi10Mg 各向异性力学性能的影响

本文研究了热处理对选择性激光熔化（SLM）形成的 AlSi10Mg 各向异性力学性能的影响。通过水平和垂直方向的 SLM 形成了 AlSil0Mg 合金样品，并对样品进行了 T6 热处理。对样品的相组成、金相结构和断口形貌进行了表征，并测试了硬度和拉伸性能。结果表明，热处理后微观结构明显均匀化。共晶 Si 相的形态由原来的网状结构变为不规则的块状和粒状。对于用 SLM 方法形成的不同取向的 AlSi10Mg 合金，其强度的各向异性差异很大（>10%）。硬度各向异性不明显，水平取向成形样品的强度和塑性较好。热处理后，不同取向成形样品的强度降低，塑性增加。不同取向的强度各向异性明显降低（<10%）。热处理前，不同取向的 AlSi10Mg 合金的拉伸断裂为脆性断裂。断口形态主要表现为阶梯状和撕裂状分布。热处理后，拉伸断裂为韧性断裂。垂直取向和水平取向的断口形态分别为等轴凹陷和剪切凹陷。

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来源期刊

Journal of Materials Engineering and Performance 工程技术-材料科学：综合

CiteScore

3.90

自引率

13.00%

发文量

1120

审稿时长

4.9 months

期刊介绍： ASM International''s Journal of Materials Engineering and Performance focuses on solving day-to-day engineering challenges, particularly those involving components for larger systems. The journal presents a clear understanding of relationships between materials selection, processing, applications and performance. The Journal of Materials Engineering covers all aspects of materials selection, design, processing, characterization and evaluation, including how to improve materials properties through processes and process control of casting, forming, heat treating, surface modification and coating, and fabrication. Testing and characterization (including mechanical and physical tests, NDE, metallography, failure analysis, corrosion resistance, chemical analysis, surface characterization, and microanalysis of surfaces, features and fractures), and industrial performance measurement are also covered