摘要
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。
Mg-6Zn-1Gd-0.6Zr magnesium alloy was processe by ECAP equipment v/a two,four,six passes at the temperature of 350℃,400℃ ,450℃ . The microstructure of the magnesium alloy before and after ECAP were examined by means of OM and TEM. The hardness of the as-extruded and unextruded Mg-6Zn-lGd -0.6Zr magnesium alloy was examined by vickers hardness tester. The rolling of the crystal plane in the process of ECAP was analyzed by X-ray diffraction.The results show that ECAP can refine grain to nanometer, and improve the hardness of magnesium alloy; it is observed that there are high density dislocations in the microstructure of ECAP magnesium alloy, it can accelerate dynamic recrystallization and plays an important role in grain refinement.
出处
《热加工工艺》
CSCD
北大核心
2007年第17期46-48,共3页
Hot Working Technology
基金
陕西省教育厅基金资助项目(05JK217)
关键词
等通道挤压
镁合金
晶粒细化
显微组织
道次
ECAP （Equal-channel Angular Pressing ）
magnesium alloy
ultra-fine grain
microstructure
passes
