中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 23 No. 11 November 2013 |
（1. Southwest Technique and Engineering Institute, Chongqing 400039, China;
2. Research Development Center of Changsha Electromechanical Products, Changsha 410100, China;
3. State Key Laboratory of Material Processing and Die and Mould Technology,
Huazhong University of Science and Technology, Wuhan 430074, China）
Abstract:Microstructure and mechanical properties of AZ61 Mg alloy during isothermal multi-axial forging (MAF) were studied. The mechanisms of grain refinement and relationship between the microstructures and mechanical properties were discussed. The results show that the average grain size decreases with increasing the number of MAF passes. The grains are significantly refined at the lst and 2nd MAF passes, and gradually refined at higher MAF passes. The initial grain size of 148 μm decreases to about 14 μm after 6 MAF passes. The grain refinement occurs mainly by continuous dynamic recrystallization. With increasing the MAF passes, both the tensile strength and the elongation to failure of the alloy are significantly enhanced.
Key words: Mg alloy; multi-axial forging; microstructure; mechanical properties
