Effect of heat treatment on the microstructure and mechanical properties of a multidirectionally forged Mg-Gd-Y-Zn-Zr-Ag alloy

• DOI: 10.1016/j.jma.2021.08.037
• Publication Date: 2021-11-16T14:30:25Z
• Authors: Junkai Wang; Chuming Liu; Shunong Jiang; Yingchun Wan; Zhiyong Chen
• Keywords: Volume fraction; Recrystallization (geology)

Multidirectional forging (MDF) was successfully applied to fabricate large-size Mg-Gd-Y-Zn-Zr-Ag alloy in this work and effects of T4, T5 T6 treatments on the microstructure mechanical properties as-forged were analyzed. Results show that dynamic recrystallization (DRX) occurs second phase particles precipitate along grain boundary during MDF process. After annealing treatment (T4), volume fraction size precipitates slightly increase at a lower temperature (430 °C) compared with those MDFed sample, while they are dissolved into α-Mg matrix higher (450 °C). At meantime, short plate-shaped long-period stacking ordered (LPSO) phases observed DRX grains sample then both temperatures. Typical basal texture is identified but pole tilts away from final direction rare-earth component <112¯1> orientation parallel penultimate becomes visible after annealing. The 430 °C for 4 h ageing 200 34 exhibits superior strength ductility study. ultimate tensile strength, yield elongation failure, which 455 MPa, 308 MPa 7.7%, respectively, overall improved directly-aged (T5) sample. This paper provides heat schedule manufacture high-performance large-scale components industrial production.