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测试四种状态下ZK60合金的显微组织和力学性能,四种状态分别为:挤压;挤压+4道次ECAP;挤压+4道次ECAP+二次挤压;挤压+4道次ECAP+退火+二次挤压。在室温下成功地进行ZK60的二次挤压,得到超细晶组织。结果表明:ECAP和二次挤压可以显著细化晶粒。挤压+4道次ECAP+二次挤压后的ZK60合金的屈服强度为342MPa,但是其伸长率只有0.8%。在二次挤压之前进行退火,ZK60合金的伸长率可以提高到4.5%,而屈服强度基本不变,抗拉强度达到 388 MPa。
The four microstructures and mechanical properties of ZK60 alloy were tested under four conditions: extrusion; extrusion + 4 passes ECAP; extrusion + 4 passes ECAP + double extrusion; extrusion + 4 passes ECAP + annealing + secondary extrusion. The secondary extrusion of ZK60 was successfully carried out at room temperature to obtain an ultra-fine grain structure. The results show that ECAP and secondary extrusion can significantly refine the grains. Extrusion +4 passes ECAP + ZK60 alloy after secondary extrusion has a yield strength of 342 MPa, but with an elongation of only 0.8%. Annealing before secondary extrusion, ZK60 alloy elongation can be increased to 4.5%, while the yield strength remains unchanged, the tensile strength of 388 MPa.