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%。
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 MgZn₂phases.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%.
作者
王勇
何承昊
米高阳
洪春权
郑凛
WANG Yong;HE Chenghao;MI Gaoyang;HONG Chunquan;ZHENG Lin(Shanghai Space Propulsion Technology Research Institute,Shanghai 201105,China;School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;School of Mechanical Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《自动化与信息工程》
2025年第4期51-62,共12页
Automation & Information Engineering
基金
国家重点研发计划(2023YFB4606300)。
