Ageing behavior of extruded Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt.%) alloy containing LPSO phase and gamma ' precipitates

作者：Xu, C.^*; Nakata, T.; Qiao, X. G.; Zheng, M. Y.^*; Wu, K.; Kamado, S.

来源：Scientific Reports, 2017, 7(1): 43391.

DOI：10.1038/srep43391

• ZN-ZR ALLOY
• MG-GD ALLOYS
• AGE-HARDENING RESPONSE
• MECHANICAL-PROPERTIES
• HIGH-STRENGTH
• MAGNESIUM ALLOYS
• MICROSTRUCTURE EVOLUTION
• POLYCRYSTAL PLASTICITY
• DEFORMATION MECHANISMS
• BETA' PRECIPITATE

The effect of long period stacking ordered (LPSO) phase and gamma' precipitates on the ageing behavior and mechanical properties of the extruded Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt.%) alloy was investigated. The results show that more beta' phases precipitate during ageing treatment in the LPSO phase containing alloy so that the LPSO phase containing alloy exhibits a higher age-hardening response than the gamma' precipitates containing alloy. The precipitation strengthening induced by beta' precipitates is the greatest contributor to the strength of the peak-aged LPSO-containing alloys. Higher strength is achieved in gamma' precipitates containing alloy due to the more effective strengthening induced by dense nanoscale gamma' precipitates than LPSO phases as well as the higher volume fraction of coarse unrecrystallized grains with strong basal texture. The extruded alloy containing gamma' precipitates after T5 peak-ageing treatment shows ultra-high tensile yield strength of 462 MPa, high ultimate tensile strength of 520 MPa, and superior elongation to failure of 10.6%.

• 出版日期2017-2-23
• 单位哈尔滨工业大学