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选区激光熔化成形Al-Si-Mg-Zr合金的微观组织与力学性能
Microstructure and Mechanical Properties of Al-Si-Mg-Zr Alloy Fabricated by Selective Laser Melting
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- DOI:
- 作者:
- 宰春凤 1 ，耿遥祥 1 ，罗金杰 1，2 ，于 江 1 ，张志杰 1 ，鞠洪博 1 ，许俊华 1
ZAI Chunfeng1 , GENG Yaoxiang1 , LUO Jinjie1,2, YU Jiang1 , ZHANG Zhijie1 , JU Hongbo1 , XU Junhua1
- 作者单位:
- 1. 江苏科技大学 材料科学与工程学院，江苏 镇江 212003；2. 昆山国力电子科技股份有限公司，江苏 昆山 215333
1. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China; 2. Kunshan Guoli Electronic Technology Co., Ltd., Kunshan 215333, China
- 关键词:
- 选区激光熔化；Al-Si-Mg-Zr 合金；热处理；显微组织；力学性能
selective laser melting; Al-Si-Mg-Zr alloy; heat treatment; microstructure; mechanical property
- 摘要:
- 本文以高 Mg 含量 Al-Si-Mg 合金为基础， 通过引入 Zr 作为晶粒细化剂， 设计并制备了选区激光熔化
(SLM)成形 Al-8.0Si-2.56Mg-0.41Zr 合金，系统研究了不同激光扫描速度对合金粉末成形性以及不同时效处理条件对
SLM成形样品微观组织和力学性能的影响。 结果表明，样品的 SLM 成形性良好，最大相对密度约为 99.5%。 样品由分布
于熔池边界的细小等轴晶和熔池内部的柱状晶构成，样品的晶粒尺寸明显小于 SLM 成形 Al-Si-Mg 合金。 成形态样品
的硬度最大值为(173±2) HV。 当时效温度≤200 ℃时，样品的 Vickers 硬度随时效温度的增加而逐渐增大；当时效
温度≥250 ℃时，样品的硬度迅速降低。 样品在 150 ℃下的等温时效处理结果表明，随着时效时间的增加，样品的硬度
和压缩屈服强度逐渐增大，当时效处理时间为 12 h 时，样品的硬度和压缩屈服强度具有最大值，分别为(194±2) HV 和
(512±4) MPa。
Based on a high Mg-content Al-Si-Mg alloy, a Zr-modified Al-8.0Si-2.56Mg-0.41Zr alloy was designed and prepared by selective laser melting (SLM) in this paper. The effects of different laser scanning speeds on the formability of alloy powder and different aging treatment conditions on the microstructure and mechanical properties of SLM-formed samples were systematically studied. The results show that the alloy exhibits good SLM formability with a maximum relative density of approximately 99.5%. The sample is composed of fine equiaxed crystals distributed at the boundary of the molten pool and columnar crystals inside the molten pool. The grain size of the sample is significantly smaller than that of the selective laser melted Al-Si-Mg alloy. The maximum hardness of the SLM-formed samples is (173±2) HV. When the aging temperature is less than or equal to 200 ℃, the Vickers hardness of the sample increases with increasing aging temperature; when the aging temperature is over or equal to 250 ℃, the hardness of the sample decreases rapidly. The hardness and compressive yield strength of the sample gradually increase with prolonged aging time at 150 ℃. The sample after aging treatment at 150 ℃ for 12 h shows the maximum hardness and compressive yield strength, which are (194±2) HV and (512±4) MPa, respectively.