Static recrystallization behavior of hot-deformed magnesium alloy AZ31 during isothermal annealing

• Published in: Transactions of Nonferrous Metals Society of China Vol. 20; no. 7; pp. 1269 - 1274
• Main Author: 杨续跃 朱亚坤 H. MIURA T. SAKAI
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2010; School of Materials Science and Engineering, Central South University, Changsha 410083, China%Department of Mechanical Engineering and Intelligent Systems, University of Electro Communications,Tokyo 182-8585, Japan
• Subjects: Annealing; AZ31; Coarsening; continuous recrystallization; EBSD技术; grain growth; Grains; Isothermal annealing; magnesium alloy; Magnesium base alloys; Recrystallization; Surface layer; Texture; 再结晶行为; 变形镁合金; 晶粒尺寸; 等温退火; 退火过程; 静态再结晶; continuous recrystallization; grain growth; AZ31; magnesium alloy; annealing; texture
• ISSN: 1003-6326
• DOI: 10.1016/s1003-6326(09)60289-2

The static recrystallization of hot-deformed magnesium alloy AZ31 during isothermal annealing was studied at temperature of 503 K by optical and SEM/EBSD metallographic observation. The grain size change during isothermal annealing is categorized into three regions, i.e. an incubation period for grain growth, rapid grain coarsening, and normal grain growth. The number of fine grains per unit area, however, decreases remarkably even in incubation period. This leads to grain coarsening taking place continuously in the whole period of annealing. In contrast, the deformation texture scarcely changes even after full annealing at high temperatures. It is concluded that the annealing processes operating in hot-deformed magnesium alloy with continuous dynamic recrystallized grain structures can be mainly controlled by grain coarsening without texture change, that is, continuous static recrystallization.