Si元素扩散对4343/3003/7072铝合金复合带性能的影响

Effects of Si Element Diffusion on Properties of 4343/3003/7072 Aluminum Alloy Composite Strip

采用抗下垂试验,利用金相显微镜、SEM、拉伸试验机、游标卡尺等研究了Si元素扩散对4343/3003/7072铝合金复合带性能的影响。结果表明:经抗下垂试验后,Si元素沿着芯材晶界向芯材扩散,同时,芯材发生熔蚀,并在晶界处形成新的Al—Si共晶。Si元素扩散越深,复合带的力学性能越小;芯材的晶粒越大,Si元素扩散程度越小,复合带的抗下垂性能就越好。

The effects of Si element diffusion on the properties of the 4343/3003/7072 aluminum alloy composite strip were studied by means of sag resistance test, metallographic microscope, tensile tester and Vernier caliper. The results show that,after the sag resistance test, the element of Si diffuses along the grain boundary of the core material to the core material.At the same time, the core material is corroded and a new Al-Si eutectic is formed at the grain boundary. The deeper the diffusion of Si element, the smaller the mechanical properties of the composite band. The bigger the grain size of the core material is, the smaller the diffusion degree of Si element is, and the better the sag resistance of the composite strip is.