GO/AlSi10Mg激光熔化沉积组织性能研究

doi:10.3901/JME.2023.01.309

机械工程学报 ›› 2023, Vol. 59 ›› Issue (1): 309-318.doi: 10.3901/JME.2023.01.309

• 制造工艺与装备 • 上一篇

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GO/AlSi10Mg激光熔化沉积组织性能研究

李鑫桐¹, 王帅¹, 杜佳鑫¹, 缪宇新¹, 陆皓^1,2, 徐济进^1,2

1. 上海交通大学材料科学与工程学院上海 200240;
2. 上海交通大学上海市激光制造与材料改性重点实验室上海 200240

收稿日期:2022-03-02 修回日期:2022-11-10 出版日期:2023-01-05 发布日期:2023-03-30
通讯作者: 徐济进(通信作者),男,1979年出生,博士,副教授,博士研究生导师。主要研究方向为焊接接头强韧化机理及调控技术、焊接力学及数值模拟。E-mail:xujijin_1979@sjtu.edu.cn
作者简介:李鑫桐,男,1997年出生。主要研究方向为铝合金激光增材制造。E-mail:787663513@sjtu.edu.cn

Study on Microstructure and Properties of GO/AlSi10Mg Composites Deposited by Laser Melting

LI Xintong¹, WANG Shuai¹, DU Jiaxin¹, MIAO Yuxin¹, LU Hao^1,2, XU Jijin^1,2

1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240;
2. Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240

Received:2022-03-02 Revised:2022-11-10 Online:2023-01-05 Published:2023-03-30

摘要/Abstract

摘要： 针对铝合金激光熔化沉积件强韧性差等问题，提出一种溶剂蒸发法制备具有粉末球形度高、流动性好、激光吸收率高且氧化石墨烯（Graphene oxide，GO）均匀分散的GO/AlSi10Mg复合粉末，采用激光溶化沉积技术（Laser melting deposition，LMD）分别打印AlSi10Mg成形件和GO/AlSi10Mg成形件，对比分析两种LMD成形件的微观组织和力学性能，探究GO调控AlSi10Mg合金成形件强韧性的机理。结果表明，添加0.1% GO的LMD成形复合材料抗拉强度提升了10.3%，延伸率提高了170%，硬度提高了5.8%，拉伸断口从脆性断裂特征转变成韧性断裂特征。GO在高能激光的作用下发生还原反应生成石墨烯，石墨烯对复合材料起到了晶粒细化的效果。拉伸试验过程中位错在石墨烯附近聚集并缠结，石墨烯在铝基体中的钉扎作用阻碍了位错的移动、促进了位错增殖，而且石墨烯与Al基体有较强界面结合，起到载荷转移和桥接作用。由于晶粒细化、位错强化、载荷转移强化以及桥接作用，提出的GO/AlSi10Mg激光熔化沉积技术提高了铝合金成形件的强韧性，为铝合金激光熔化沉积技术的应用和发展提供了有效技术手段。

关键词: 激光熔化沉积, AlSi10Mg合金, 氧化石墨烯, 强韧化机理, 溶剂蒸发法

Abstract: Aiming at the problems of poor strength and toughness of aluminum alloy deposited by laser melting, a solvent evaporation method is proposed to prepare GO/AlSi10Mg composite powders with high powder sphericity, good fluidity, high laser absorption and evenly dispersed graphene oxide (GO). Laser melting deposition (LMD) is used to print AlSi10Mg and GO/AlSi10Mg forming parts, separately. The microstructures and mechanical properties of the two LMD forming parts are compared and analyzed, and the mechanism of GO regulating the strength and toughness of AlSi10Mg alloy forming parts is explored. The results show that the tensile strength of the LMD forming composite with 0.1wt% GO increase by 10.3%, the elongation increase by 170%, the hardness increase by 5.8%, and the tensile fracture change from brittle fracture to ductile fracture. GO undergoes a reduction reaction under the action of a high-energy laser to generate graphene, and graphene has the effect of grain refinement on the composite material. During the tensile test, dislocations gather and entangle near the graphene. The pinning effect of the graphene in the aluminum matrix hinders the movement of the dislocations and promotes the proliferation of the dislocations, and the graphene has a strong interface bond with the Al matrix, and plays the role of load transfer and bridging. Due to grain refinement, dislocation strengthening, load transfer strengthening and bridging effects, the proposed LMD technology of GO/AlSi10Mg improves the strength and toughness of aluminum alloy forming parts, and provides an effective technical method for the application and development of aluminum alloy laser melting deposition technology.

Key words: laser melting deposition, AlSi10Mg alloy, graphene oxide, strengthening and toughening mechanism, solvent evaporation method

中图分类号:

TN249

李鑫桐, 王帅, 杜佳鑫, 缪宇新, 陆皓, 徐济进. GO/AlSi10Mg激光熔化沉积组织性能研究[J]. 机械工程学报, 2023, 59(1): 309-318.

LI Xintong, WANG Shuai, DU Jiaxin, MIAO Yuxin, LU Hao, XU Jijin. Study on Microstructure and Properties of GO/AlSi10Mg Composites Deposited by Laser Melting[J]. Journal of Mechanical Engineering, 2023, 59(1): 309-318.

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GO/AlSi10Mg激光熔化沉积组织性能研究

Study on Microstructure and Properties of GO/AlSi10Mg Composites Deposited by Laser Melting

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