连续变断面循环挤压AZ31镁合金的组织与性能

摘要

采用连续变断面循环挤压法分别对变形镁合金AZ31铸锭和商业AZ31进行不同循环道次的变形,考察其组织、性能变化.结果表明:AZ31镁合金铸锭经过一个循环的挤压,晶粒明显细化.商业AZ31铝合金材料分别进行2、4、6、8次循环变形,随着变形量增大,平均晶粒尺寸不断减小,组织趋于均匀;真应变为16时,平均晶粒尺寸为5.5 μm;随着循环次数增加,伸长率不断增加,与原始态的相比可提高2倍左右,但强度没有明显变化.%Melted AZ31 magnesium alloy ingot and commercial magnesium alloy AZ31 material were deformed different procedures and cycles by continuous variable section extrusion cycle. The results showed that CVCE technology can make the material structure refine, and the refining effect was very notable. As the deformation amount increases, average grain size decreases, structure tends to homogeneous. When the real strain is 16, its average grain size is 5.5 μm and homogeneous. As the cycle index increases, elongation percentage increases end to end, comparing to that of before deformation, it increases about 2 times.