Quasi-in-situ observing the rare earth texture evolution in an extruded Mg-Zn-Gd alloy with bimodal microstructure
Quasi-in-situ observing the rare earth texture evolution in an extruded Mg-Zn-Gd alloy with bimodal microstructure
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DOI：
10.1016/j.jma.2020.09.001
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发表时间：
2021-09-15
影响因子：
17.6
通讯作者：
Han, E. H.
中科院分区：
文献类型：
--
作者：
Jiang, M. G.;Xu, C.;Han, E. H.
用准原位电子背散射衍射法(EBSD)研究了挤压成形的双峰组织的Mg-Zn-Gd合金的静态再结晶及其织构演化过程。典型的稀土(RE)织构是在退火过程中形成的，由[10(1)Over bar0]基纤维织构演变而来，由细小的再结晶(RXed)晶和粗大的未再结晶(UnRXed)晶组成，沿挤压方向拉长。在RXed区和非RXed区，RXed形核都产生了无择优取向的随机取向，具有RE织构取向的RXed晶粒比具有基纤维取向的RXed晶粒具有更强的生长能力，从而导致了晶粒生长过程中择优选择RE织构取向。详细讨论了储能、溶质阻力、晶粒长大和织构演化之间的关系。本研究为挤压镁稀土合金中稀土织构的演化提供了直接的证据，有助于理解挤压过程中稀土织构的形成机理，有助于更好地开发具有更好成形性的变形镁合金。(三)2020年重庆大学。爱思唯尔公司代表科爱通信有限公司提供的出版服务。
The static recrystallization and associated texture evolution were investigated in an extruded Mg-Zn-Gd alloy with bimodal microstructure based on a quasi-in-situ electron back-scatter diffraction (EBSD) method. The typical rare earth (RE) texture formed during annealing, evolving from the bimodal microstructure with [10 (1) over bar0] basal fiber texture that consisted of fine recrystallized (RXed) grains and coarse unrecrystallized (unRXed) grains elongated along the extrusion direction. In both RXed and unRXed regions, the RXed nucleation produced randomized orientations without preferred selection and the RXed grains with RE texture orientation had more intensive growth ability than those with basal fiber orientation, thereby leading to the preferred selection of RE texture orientation during grain growth. The relationships between stored strain energy, solute drag, grain growth and texture evolution are discussed in detail. This study provided direct evidence of the RE texture evolution in an extruded Mg-RE alloy, which assists in understanding the formation mechanisms for RE texture during extrusion and better developing wrought Mg alloys with improved formability. (C) 2020 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.