高级检索
    李德银, 万银根, 谢兰生, 陈明和. 7075-T6铝合金的放电等离子烧结连接工艺优化[J]. 机械工程材料, 2024, 48(9): 44-52. DOI: 10.11973/jxgccl230359
    引用本文: 李德银, 万银根, 谢兰生, 陈明和. 7075-T6铝合金的放电等离子烧结连接工艺优化[J]. 机械工程材料, 2024, 48(9): 44-52. DOI: 10.11973/jxgccl230359
    LI Deyin, WAN Yingen, XIE Lansheng, CHEN Minghe. Optimization of Spark Plasma Sintering Joining Process of 7075-T6 Aluminum Alloy[J]. Materials and Mechanical Engineering, 2024, 48(9): 44-52. DOI: 10.11973/jxgccl230359
    Citation: LI Deyin, WAN Yingen, XIE Lansheng, CHEN Minghe. Optimization of Spark Plasma Sintering Joining Process of 7075-T6 Aluminum Alloy[J]. Materials and Mechanical Engineering, 2024, 48(9): 44-52. DOI: 10.11973/jxgccl230359

    7075-T6铝合金的放电等离子烧结连接工艺优化

    Optimization of Spark Plasma Sintering Joining Process of 7075-T6 Aluminum Alloy

    • 摘要: 采用放电等离子烧结技术对7075-T6铝合金进行连接,通过单因素法研究了母材表面预处理(400#砂纸打磨、化学浸蚀、400#砂纸打磨+化学浸蚀、2000#砂纸打磨+化学浸蚀)以及升温速率(10,30,50 ℃·min−1)、连接温度(450,470,490,510 ℃)、连接压力(4.5,5.0,5.5,6.0,7.0 MPa)和保温时间(45,60,75,90,120 min)对接头连接质量、剪切性能和变薄率的影响,确定了合适的表面预处理工艺以及最优的工艺参数。结果表明:合适的表面预处理工艺为400#砂纸打磨,获得7075-T6铝合金接头的连接质量最好,接头界面未闭合孔洞很少,焊合率最大,为71.7%;随着升温速率的升高,接头的连接质量变差,但其焊合率均高于76%,接头的抗剪强度和变薄率均降低;随着连接温度的升高或连接压力的增加,接头的连接质量变好,接头的焊合率、抗剪强度和变薄率均增大,但当连接压力大于6.0 MPa时,焊合率和抗剪强度增加幅度减小,而变薄率大幅增加;随着保温时间的延长,接头的焊合率、抗剪强度和变薄率的变化幅度均较小。400#砂纸打磨后7075-T6铝合金的最优连接工艺为升温速率50 ℃·min−1、连接压力6.0 MPa、连接温度490 ℃、保温时间45 min,此时接头的焊合率为81.3%,抗剪强度为132.9 MPa,变薄率为1.91%,剪切断裂方式为韧性断裂。

       

      Abstract: The 7075-T6 aluminum alloy was joined by spark plasma sintering technique. The effects of base metal surface pretreatment (400# sandpaper grinding, chemical etching, 400# sandpaper grinding + chemical etching and 2000# sandpaper grinding + chemical etching), heating rate (10, 30, 50 °C · min−1), joining temperature (450, 470, 490, 510 °C), joining pressure (4.5, 5.0, 5.5, 6.0, 7.0 MPa) and holding time (45, 60, 75, 90, 120 min) on the joining quality, shear properties and thinning rate of the joint were studied by single factor method, and the appropriate surface pretreatment process and the optimal process parameters were obtained. The results show that the appropriate surface pretreatment was 400# sandpaper grinding; at this time the joining quality of 7075-T6 aluminum alloy joint was the best, there were few unclosed holes in the joint interface, and the bonding rate was largest with value of 71.7%. With the increase of heating rate, the joining quality of the joint became worse, but the bonding rate was higher than 76%, and the shear strength and thinning rate of the joint decreased. With the increase of the joining temperature or the joining pressure, the joining quality of the joint became better, and the bonding rate, shear strength and thinning rate of the joint increased. However, when the joining pressure was greater than 6.0 MPa, the increase of bonding rate and shear strength decreased, while the thinning rate increased significantly. With the increase of holding time, the variation of the bonding rate, shear strength and thinning rate of the joint was small. The optimum joining process of 7075-T6 aluminum alloy was heating rate of 50 °C min−1, joining pressure of 6.0 MPa, joining temperature of 490 °C and holding time of 45 min. At this time, the bonding rate of the joint was 81.3%, the shear strength was 132.9 MPa, the thinning rate was 1.91%, and the shear fracture mode was ductile fracture.

       

    /

    返回文章
    返回