(1. 中南大學 材料科學與工程學院，長沙 410083；
2. 中南大學 教育部有色金屬材料科學與工程重點實驗室，長沙 410083)
摘 要: 通過光學顯微鏡及SEM/EBSD觀察研究強變形AZ31鎂合金在300~673 K的退火行為，分析顯微組織、晶粒尺寸分布、平均晶粒尺寸、硬度及變形織構(gòu)隨退火溫度的變化。結(jié)果表明：細晶組分隨著溫度的升高不斷降低，退火過程按退火溫度可分為孕育、再結(jié)晶急速長大及晶粒正常長大3個階段。強變形過程中，發(fā)生連續(xù)動態(tài)再結(jié)晶的鎂合金在隨后的退火過程中主要受晶粒長大控制，沒有發(fā)生織構(gòu)變化，即為連續(xù)靜態(tài)再結(jié)晶。
關(guān)鍵字: 強變形鎂合金；退火；連續(xù)再結(jié)晶；微觀織構(gòu)
severe deformation
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083, China）
Abstract:Static recrystallization of severely deformed magnesium alloy was studied by optical and SEM/EBSD observation at temperatures from 300 K to 673 K. The changes of microstructure, grain size distribution, average grain size, hardness and deformation texture with annealing temperature were analysed. The results show that the proportion of fine grain reduces as the annealing temperature increases. The annealing temperature dependence of the average grain size is categorized into three temperature regions, i.e. the first period for grain incubation, the second period for rapid grain coarsening, and the third period for grain normal growth. The annealing processes operating in severely deformed magnesium alloy with continuous dynamic recrystallized grain structures can be mainly controlled by grain coarsening accompanied with no texture change, which is continuous static recrystallization.
Key words: severely deformed magnesium alloy; annealing; continuous recrystallization; microtexture
