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正火处理对Cu/Al爆炸焊接板显微结构及力学性能的影响

Influence of normalizing on microstructure and mechanical properties of Cu/Al explosive welded plate

  • 摘要: 采用爆炸焊接技术制备出以T2紫铜为覆板、1060工业纯铝为基板的T2/1060层状复合板.300℃正火处理12,24,36,48 h后,对复合板结合界面的微观结构及各项力学性能进行了测试与分析.结果表明,T2/1060爆炸焊接板焊接质量良好,结合界面出现规则的、幅值/宽度分别约为35 μm/200 μm的波形结合.正火处理48 h后,两种元素在结合界面附近互相扩散明显,其扩散层的厚度、均匀程度有明显的提高;力学性能方面,试样的显微硬度、抗拉强度明显下降(分别从215 HV,255.7 MPa降为170 HV,228.8 MPa),而延展性有明显提升(屈服应变由3.64%变为22.4%).

     

    Abstract: The copper-T2/aluminum-1060 composite plate is fabricated by explosive welding, using the flying plate of copper-T2 and the base plate of aluminum-1060. After normalizing at 300℃ in intervals, i.e., 12, 24, 36, 48 h for different time, the microstructure, diffusion layers and different mechanical properties of samples were observed and tested. Our results show that the copper-T2/aluminum-1060 alloy composite can be well jointed via explosive welding method, and a typical metal/metal wavy interface, having a period of 200 μm at a relative constant amplitude of about 35 μm, is revealed. In addition, normalizing treatment has a remark contribution to the increase of diffusion layer's thickness. The longer heat treatment time is, the thicker diffusion layers are. With respect to the influence of normalizing on samples' mechanical properties, we find that after a 48-hour heat treatment, the micro-hardness, tensile strength and elongation change from 215 HV, 255.7 MPa, 3.64% to 170 HV, 228.8 MPa, 22.4%, respectively.

     

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