Effect of heat treatment on microstructure and properties of 7175 aluminum alloy prepared by SLM for sports equipment

doi:10.13251/j.issn.0254-6051.2024.06.019

Abstract

Abstract: Microstructure, hardness and phase transformation of 7175 aluminum alloy prepared by selective laser melting(SLM) after solution treatment and two-stage aging were investigated by means of OM, scanning electron microscope (SEM), transmission electron microscope (TEM) and microhardness tester. The experimental results reveal that the microstructure of the SLMed 7175 alloy shows significant inter-channel heterogeneity. After solution and two-stage aging treatment, the alloy shows uniform and fine microstructure, and the channel structure disappears. The hardness of the alloy after heat treatment is higher than that of the SLMed alloy (83 HV0.3), reaching an average of about 162 HV0.3. The precipitation S phase (Al₂CuMg) and θ phase (Al₂Cu) at the grain boundaries are the strengthening phases of alloy hardness, which provides the effect of dispersion strengthening and precipitation strengthening.

Key words: 7175 aluminum alloy, selective laser melting(SLM), heat treatment, microstructure, mechanical properties

CLC Number:

TG441.8

Wang Lei, Jia Liangliang. Effect of heat treatment on microstructure and properties of 7175 aluminum alloy prepared by SLM for sports equipment[J]. Heat Treatment of Metals, 2024, 49(6): 115-119.

References

[1]刘松. 时效温度对激光选区熔化成形AlSi7Mg铝合金显微组织的影响[J]. 金属热处理, 2023, 48(7): 205-213.
Liu Song. Effect of aging temperature on microstructure of AlSi7Mg alloy prepared by selective laser melting[J]. Heat Treatment of Metals, 2023, 48(7): 205-213.
[2]姜超, 贾东永, 周志勇, 等. 激光选区熔化高强铝合金件的热处理及空间环境性能[J]. 金属热处理, 2022, 47(7): 1-8.
Jiang Chao, Jia Dongyong, Zhou Zhiyong, et al. Heat treatment and space environment performance of high-strength aluminum alloy parts fabricated by selective laser melting[J]. Heat Treatment of Metals, 2022, 47(7): 1-8.
[3]曾强, 吴颖, 肖辉进, 等. 热处理对激光选区熔化制备Inconel 718合金组织和拉伸性能的影响[J]. 金属热处理, 2021, 46(10): 122-127.
Zeng Qiang, Wu Ying, Xiao Huijin, et al. Effect of heat treatment on microstructure and tensile properties of Inconel 718 alloy prepared by selective laser melting[J]. Heat Treatment of Metals, 2021, 46(10): 122-127.
[4]何先定, 吴凌, 安治国. 选区激光熔化成形AlSi10Mg铝合金零件支撑结构的研究[J]. 锻压技术, 2020, 45(9): 113-117, 136.
He Xianding, Wu Ling, An Zhiguo. Research on support structure for AlSi10Mg aluminum alloy parts by selective laser melting[J]. Forging and Stamping Technology, 2020, 45(9): 113-117, 136.
[5]Sha J, Li M, Yang L, et al. Si-assisted solidification path and microstructure control of 7075 aluminum alloy with improved mechanical properties by selective laser melting[J]. Acta Metallurgica Sinica(English Letters), 2022, 35(9): 1424-1438.
[6]李颖, 彭霜, 张婷, 等. 选区激光熔化制备Ti-6Al-4V合金的热处理工艺及力学性能[J]. 金属热处理, 2022, 47(9): 175-181.
Li Ying, Peng Shuang, Zhang Ting, et al. Heat treatment process and mechanical properties of selective laser melted Ti-6Al-4V alloy[J]. Heat Treatment of Metals, 2022, 47(9): 175-181.
[7]Yi J L, Chang C, Yan X C, et al. A novel hierarchical manufacturing method of the selective laser melted Al 7075 alloy[J]Materials Characterization, 2022, 191(1): 145-151.
[8]吕周晋, 李好峰, 车立达, 等. HIP温度对SLM制备TC4钛合金组织和力学性能的影响[J]. 金属热处理, 2022, 47(6): 138-142.
Lü Zhoujin, Li Haofeng, Che Lida, et al. Effect of HIP temperature on microstructure and mechanical properties of TC4 titanium alloy prepared by SLM[J]. Heat Treatment of Metals, 2022, 47(6): 138-142.
[9]孙颖, 郑留伟, 张慧云. 选区激光熔化打印Al_0.5CoCrFeNiTi_0.5/316L复合材料的微纳力学及耐蚀性能[J]. 金属热处理, 2023, 48(5): 60-65.
Sun Ying, Zheng Liuwei, Zhang Huiyun. Micro and nano mechanical properties and corrosion resistance of SLM-printed Al_0.5CoCrFeNiTi_0.5/316L composites[J]. Heat Treatment of Metals, 2023, 48(5): 60-65.
[10]康举, 梁苏莹, 吴爱萍, 等. 2219 铝合金搅拌摩擦焊中的局部液化现象及对接头力学性能的影响[J]. 金属学报, 2017(3): 358-368.
Kang Ju, Liang Suying, Wu Aiping, et al. Local liquation phenomenon and its effect on mechanical properties of joint in friction stir welded 2219 Al alloy[J]. Acta Metallurgica Sinica, 2017(3): 358-368.
[11]乔及森, 夏浩, 夏天东, 等. 喷射成形 7055 铝合金型材的力学性能[J]. 材料研究学报, 2014, 28(12): 914-918.
Qiao Jisen, Xia Hao, Xia Tiandong, et al. Mechanical properties of extrusions of spray formed 7055 Al alloy[J]. Chinese Journal of Materials Research, 2014, 28(12): 914-918.

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