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对Mg-6Zn-1Gd-0.6Zr合金在预热温度为350、400、450℃下进行了2、4、6道次的挤压。采用光学显微镜和透射电子显微镜分析了试样ECAP变形前后的显微组织变化,采用显维硬度计对Mg-6Zn-1Gd-0.6Zr合金ECAP变形前后进行了硬度测试,采用X-射线分析法分析了ECAP变形过程中晶面的转动。结果表明:ECAP不仅能够将晶粒细化到纳米级,而且能够提高材料的硬度;Mg-6Zn-1Gd-0.6Zr合金ECAP变形后晶粒内部出现高密度位错,促进动态再结晶,对细化晶粒起着重要的作用。
The Mg-6Zn-1Gd-0.6Zr alloy was pre-heated at 350, 400, 450 ℃ for 2, 4, and 6 times. The changes of microstructure before and after ECAP deformation were analyzed by optical microscope and transmission electron microscope. The hardness of ECAP before and after ECAP deformation of Mg-6Zn-1Gd-0.6Zr alloy was tested by X-ray hardness tester. The X-ray analysis ECAP deformation during the crystal plane rotation. The results show that ECAP not only can refine the grain to nanometer scale, but also improve the hardness of the material. High density dislocations inside the grain after ECAP deformation of Mg-6Zn-1Gd-0.6Zr alloy promote the dynamic recrystallization, Crystallization plays an important role.