Simultaneously Enhanced Mechanical Properties and Damping Capacities of ZK60 Mg Alloys Processed by Multi-Directional Forging

• 作者: L.B.Tong J.H.Chu D.N.Zou Q.Sun S.Kamado H.G.Brokmeier M.Y.Zheng
• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2021,（2）
• 页码范围: 265-277
• 页数: 13页
• 语种: 英文

摘要

In this study,the mechanical properties and damping capacities of cast Mg-5.5Zn-0.6Zr (weight percent,ZK60) alloys have been simultaneously improved by a facile multi-directional forging (MDF) processing,and the mechanisms of microstructure evolution and texture modification are systematically investigated.The activation of tension twinning occurs during the initial MDF stage,due to the coarse-grained structure of the as-cast alloy.With increasing MDF passes,the continuous dynamic recrystallization (CDRX) results in a fine equiaxed-grain structure.The typical non-basal texture is formed in the as-MDFed alloy for 6 passes,with the (0001) planes inclined 60°-70° to forged direction and 10°-20° to transverse direction,respectively.A good balance between the strength (～ 194.9 MPa) and ductility (～ 24.9％) has been achieved,which can be ascribed to the grain refinement,non-basal texture and fine precipitate particles.The damping capacity is remarkably improved after MDF processing,because the severe deformation increases the dislocation density,which effectively enlarges the sweep areas of mobile dislocations.