奉隆彪,黎小辉,宋旭东,袁鸽成,卢凤池.Mg-1Zn-1Gd合金在等径角挤压下的晶粒细化机理及织构演变[J].稀有金属材料与工程,2020,49(10):3325~3331.[Feng Longbiao,Li Xiaohui,Song Xudong,Yuan Gecheng,Lu Fengchi.Grain Refinement and Texture Evolution of Mg-1Zn-1Gd Alloy by the Equal Channel Angular Pressing[J].Rare Metal Materials and Engineering,2020,49(10):3325~3331.]
Mg-1Zn-1Gd合金在等径角挤压下的晶粒细化机理及织构演变
投稿时间:2019-08-16  修订日期:2019-10-06
中文关键词:  Mg-Zn-Gd合金  等径角挤压  晶粒细化  动态再结晶  织构
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:
      研究等径角挤压(ECAP)对Mg-1Zn-1GD合金组织、织构和动态再结晶行为的影响,结果表明,在350℃等径角挤压后,试样的显微组织由细小的再结晶晶粒组成,基体中有大量均匀分布的等轴晶。8道次获得平均晶粒尺寸为3.6m的均匀超细晶粒结构。不连续动态再结晶(DDRX)和连续动态再结晶(CDRX)导致晶粒细化。利用电子背散射衍射技术对织构进行了分析。结果表明,经过4次ECAP后,形成了较强的基础纹理(多重随机分布~19.76)。随着挤压道次的增加,挤压合金板材基面上的晶粒主要沿挤压方向拉长,取向分布由集中状态向分散状态转变。织构减弱,最大值为15.66。最后表明织构与Mg-1Zn-1GD合金的平面各向异性有关.
Grain Refinement and Texture Evolution of Mg-1Zn-1Gd Alloy by the Equal Channel Angular Pressing
英文关键词:Mg-Zn-Gd alloy  Equal Channel Angular Pressing  grain refinement  DRX  texture
英文摘要:
      In this paper, in order to find out the effect of Equal Channel Angular Pressing (ECAP) on the microstructure and texture, as well as dynamic recrystallization (DRX) behavior, Mg-1Zn-1Gd alloy (wt.%) was investigated. The results show that after the equal channel angular pressing at 350℃, the microstructures of these samples is composed of fine recrystallized grains, and there are a large number of homogeneously distributed equiaxed grains in the matrix. Upon 8 passes, the uniform ultra-fine grain structure with an average grain size of 3.6 μm is obtained. The mechanism of the discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) lead to grain refinement. The micro-texture was analyzed through electron backscatter diffraction (EBSD) technique. It is revealed that after 4 passes of ECAP, a strong basal texture is achieved (multiple?random?distribution?~19.76). With the extrusion passes increasing, the grain in the basal planes of extruded alloy billet is mainly elongated along the extrusion direction, the orientation distribution changes from concentrated state to decentralized state. The texture is weakened which the maximum strength is 15.66 mrd. Finally, the texture is also related to the plane anisotropy of the Mg-1Zn-1Gd alloy.
作者单位E-mail
奉隆彪 广东省科学院材料与加工研究所 1309426638@qq.com 
黎小辉 广东省科学院材料与加工研究所  
宋旭东 广东省科学院材料与加工研究所 289789936@qq.com 
袁鸽成 广东工业大学 gchyuan@gdut.edu.cn 
卢凤池 广东省科学院材料与加工研究所 447969194@QQ.com 
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