王勇1  何承昊2  米高阳2  洪春权3  郑凛2

（1.上海航天动力技术研究所，上海 201105

2.华中科技大学材料科学与工程学院，湖北 武汉 430074

3.华中科技大学机械科学与工程学院，湖北 武汉 430074）

摘要：纳米TiC颗粒增强7034铝基复合材料因具有高强度、高硬度和低密度等特点，已成为具有广阔应用前景的轻量化材料。针对7034铝合金中低沸点Zn、Mg元素含量较高，在高温熔池中易沸腾蒸发，产生气孔、裂纹等缺陷，影响其力学性能的问题，采用摆动激光-电弧复合增材制造工艺制备纳米TiC颗粒增强7034铝基复合材料，并研究固溶、固溶时效处理对其微观组织结构、力学性能的影响。测试结果表明：固溶处理可促进MgZn2相的溶解，在固溶处理后再进行时效处理，可使试样的第二相分布更均匀、尺寸更细化，其抗拉强度最高提升至569.83 MPa，延伸率为1.44%。通过优化固溶温度和时效工艺，使复合材料的抗拉强度提高了70%。 

关键词：纳米TiC颗粒；7034铝基复合材料；激光-电弧复合增材制造；固溶时效处理；热处理

中图分类号：TG146.2          文献标志码：A           文章编号：1674-2605(2025)04-0007-12

DOI：10.12475/aie.20250407                                  开放获取

Effect of Heat Treatment on Microstructure and Properties of As-deposited Nano-TiC/7034 Composite Materials

WANG Yong1  HE Chenghao2  MI Gaoyang2  HONG Chunquan3  ZHENG Lin2

(1.Shanghai Space Propulsion Technology Research Institute, Shanghai 201105, China

2.School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan   430074, China  3.School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China )

Abstract: Nano-TiC particle-reinforced 7034 aluminum matrix composites exhibit high strength, high hardness, and low density, making them promising lightweight materials. However, the high content of low-boiling-point elements (Zn, Mg) in 7034 aluminum alloy leads to boiling and evaporation in the high-temperature molten pool, resulting in defects such as pores and cracks, which degrade mechanical properties. To address this, a swing laser-arc hybrid additive manufacturing process was employed to fabricate nano-TiC-reinforced 7034 aluminum matrix composites. The effects of solution treatment and solution-aging treatment on microstructure and mechanical properties were investigated. The results indicate that solution treatment promotes the dissolution of MgZn₂ phases. Subsequent aging treatment after solution treatment leads to a more uniform distribution and finer size of secondary phases, increasing the ultimate tensile strength to 569.83 MPa with an elongation of 1.44%. By optimizing the solution temperature and aging process, the tensile strength of the composite was improved by 70%.

Keywords: nano-TiC particles; 7034 aluminum matrix composites; laser-arc hybrid additive manufacturing; solution-aging treatment; heat treatment