循环扩挤平面变形对7A04铝合金组织与性能的影响

Effect of cyclic expansion-extrusion plane deformation on microstructure and mechanical properties of 7A04 aluminum alloy

多次循环扩挤成形技术是一种新型的大塑性变形技术,是制备亚微米或纳米级块体材料的有效方法之一。通过7A04铝合金经过一次循环扩挤平面变形的有限元模拟分析和挤压成形实验,并借助于ZEISS Image Alm金相显微镜、ZMT5105电子万能拉伸材料试验机、维氏硬度测试计等仪器设备,研究了不同变形道次下的循环扩挤平面变形对7A04铝合金的力学性能与显微组织的影响。研究结果表明:二道次挤压后试样的抗拉强度、屈服强度、硬度与伸长率均比一道次的高,晶粒细化效果更明显。

Repeated cyclic expansion-extrusion（ CEE） is a new method of severe plastic deformation,which is one of the effective preparative methods of sub micron or scale bulk materials. The finite element simulation analysis and extrusion forming experiment of 7A04 aluminum alloy after one cyclic expansion-extrusion plane deformation were carried out. And with the aid of ZEISS Image Alm microscope,ZMT5105 electronic universal tensile machine,Vivtorinox hardness tester and other equipments,the influence of cyclic expansion-extrusion plane deformation under different deformation pass on microstructure and mechanical properties of 7A04 aluminum alloy was studied. Research results show that the strength,elongation and hardness of the sample after two CEE pass are higher than that after one CEE pass,and the grain refinement effect is more obvious.