下压量与静态退火对Mg-Gd-Y-Zr热轧板材的织构影响（英文）  

Effect of thickness reduction and static recrystallization on texture of Mg-Gd-Y-Zr alloy hot-rolled sheet

作　　者：李理[1,2] 伍杰 吴远志[1] 邓彬[1] LI Li WU Jie WU Yuan-zhi DENG Bin(Institute of Advanced Manufacturing Technology, Hunan Institute of Technology, Hengyang 421002, China Institute for Frontier Materials, Deakin University, Geelong 3220, Australia)

机构地区：[1]湖南工学院先进制造技术研究所,湖南衡阳421002 [2]迪肯大学前沿材料研究院

出　　处：《塑性工程学报》2017年第5期117-124,共8页Journal of Plasticity Engineering

基　　金：湖南省自然科学基金项目(2017JJ4020);湖南省教育厅重点科研项目(16A051);湖南工学院留学归国人员科研基金(HY15038)

摘　　要：研究了Mg-9Gd-4Y-0.4Zr高强耐热镁合金在热轧及随后静态退火过程中的微结构与织构的演变,以此来确定静态再结晶对轧制织构的影响及其机制。采用金相显微术、扫描电子显微术、透射电子显微术及EBSD分析技术表征了试样在不同下压量和随后退火过程中的微结构及织构改变。织构测试的结果表明,单向热轧变形产生了六方晶格c轴偏离理想基面织构15°的新织构组分;随后的再结晶过程导致新织构组分趋于漫散化并加强了基面织构。显示晶内和晶界上大量析出的沉淀相显著抑制了晶界迁移;静态再结晶对织构的影响是由定向形核控制的,而不是定向长大。Microstructure and texture evolution of Mg-9Gd-4Y-0. 4Zr alloy with high strength and heat resistance during hot rolling and subsequent annealing was investigated to ascertain the effect of static recrystallization on texture and its mechanism. The samples subjected to different thickness reductions and annealing durations were examined by optical microscopy,scanning electron microscope（ SEM） and transmission electron microscope（ TEM）,and electron back-scattered diffraction EBSD. The results of texture analysis show that a novel texture component with c-axis deviates some 15° away from the ideal basal orientation is obtained in the unidirectional hot rolling. Static recrystallization process randomizes the dominant texture and strengthen the basal orientations. The microstructural analysis that a large amount of intra-granular and inter-granular precipitates exert significant inhibition on the migration of grain boundaries. It is proved that the static recrystallization texture is controlled by oriented nucleation,instead of oriented growth.

关 键 词：MG-GD-Y-ZR合金 织构 静态再结晶 热轧制 

分 类 号：TG146.2[一般工业技术—材料科学与工程]