Microstructure transformation of deformed AZ91D during isothermal holding

• Published in: Transactions of Nonferrous Metals Society of China Vol. 20; no. 1; pp. 14 - 21
• Main Author: 张友法 刘勇兵 曹占义 张亮
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2010; Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering,Southeast University, Nanjing 211189, China%Key Laboratory of Automobile Materials of Ministry of Education, School of Materials Science and Engineering,Jilin University, Changchun 130022, China
• Subjects: AZ91D magnesium alloy; AZ91D合金; AZ91D镁合金; Billets; deformation; Deformation mechanisms; Heating; isothermal holding; Magnesium base alloys; Microstructure; microstructure transformation; Ostwald ripening; Ostwald熟化; Recrystallization; Spheroidizing; Transformations; 剩余能量; 变形机制; 微观结构; 热力学性质; 等温变形; deformation; AZ91D magnesium alloy; microstructure transformation; isothermal holding
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(09)60090-X

In order to understand the thermodynamic properties of deformed AZ91D alloy during isothermal holding, the microstructure characteristics and transformation were investigated. The results present that deformation mainly concentrates on the edge of the chips and billets, especially at the interface of α/β. Microstructure transformation mechanism of deformed AZ91D during holding mainly includes recrystallization, spheroidization and Ostwald ripening. The mechanism was then thermodynamically analyzed. During the heating and isothermal holding process, recrystallization driven by residual energy within the deformed AZ91D alloy, spheroidization and Ostwald ripening induced by the reduction of interracial energy, will inevitably and continuously occur with the extension of heating and holding.