(1. 河南理工大学 材料科学与工程学院,焦作 454000;
2. 河南理工大学 经济管理学院,焦作 454000)
摘 要: 在300 ℃将d 50 mm的铸态Mg-6Zn-1Y-1Ce合金挤压成d 14 mm、d 12 mm和d 10 mm的棒材,使用X射线衍射、光学显微镜、扫描电镜和透射电镜分析合金组织,测试其室温拉伸性能。结果表明:合金再结晶组织与挤压比相关,挤压比越大,再结晶越充分;d 14 mm、d 12 mm和d 10 mm试样的再结晶面积分数分别为69.0%、85.8%和99.1%,平均晶粒尺寸分别为2.7、2.9和5.9 μm,屈服强度分别为327.4、286.5和237.5 MPa。合金的高强度归因于合金化和细晶强化的综合作用。
关键字: 镁合金;挤压比;组织;拉伸性能
(1. School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;
2. School of Economic and Management, Henan Polytechnic University, Jiaozuo 454000, China)
Abstract:Mg-6Zn-1Y-1Ce alloy bars with diameters of 14 mm, 12 mm and 10 mm were prepared by extrusion from as-cast ingots with diameter of 50 mm at 300 ℃. The microstructures were examined by XRD, OM, SEM and TEM, and the tensile properties were tested at room temperature. The results show that the recrystallization microstructure of as-extruded alloys correlates to the extrusion ratio. The recrystallized area fractions for bars of d 14 mm, d 12 mm and d 10 mm are 69.0%, 85.8% and 99.1%, respectively. The mean grain sizes are 2.7, 2.9 and 5.9 μm, respectively. The yield strengths are 327.4, 286.5 and 237.5 MPa, respectively. The high strengths are attributed to the combined action of alloying and fine-grain strengthening mechanism.
Key words: magnesium alloy; extrusion ratio; microstructure; tensile properties