ZK60镁合金经350 ℃往复挤压8道次后，晶粒尺寸显著细化，平均晶粒尺 寸从约20 μm细化到约1.5 μm，组织均匀性大大改善. 经往复挤压后，丝织构转变为 {1 0 -1 3}〈3 0 -3 2 〉+{1 0 -1 1}〈1 -5 4 3〉 织构，且最大极密度下降. 由于组织的细化和织构的改变，ZK60镁合金 的室温轴向压缩屈服强度大幅度提高，轴向拉伸屈服强度 有所下降，合金的拉压强度差异性基本消除; 同时, 合金的塑性明显提高，尤其是在压缩条件下， 延伸率从15%增加到38%.
Effects of cyclic extrusion and compression (CEC) deformation on the microstructure, texture and mechanical properties of ZK60 Mg alloy were investigated. The strengthening mechanism of CECed ZK60 Mg alloy was discussed in detail. Results shown, after subjected to CEC deformation 8 passes at 350℃, the microstructure of ZK60 alloy is dramatically refined and uniformed, the average grain size is decreased from ～20µm to ～1.5µm, the initial fiber texture is vanished and revealed a {10-13}<30-32>+{10-11}<15-43> texture. With the microstructure refining and texture changing, the compression yield stress of ZK60 alloy increased dramatically and the tension yield stress decreased slightly. As a result, the strength-differential effect (SDE) of ZK60 alloy is eliminated. At the same time, the ductility of ZK60 alloy is enhanced, especially under compression, the elongation is increased up to 38% from 15%.
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