Dynamic strain aging precipitation of Mg17Al12 in AZ80 magnesium alloy during multi-directional forging process

7th International Conference on Nanomaterials by Severe Plastic Deformation

Zhu, Q.F.^1,2 ; Wang, G.S.^1,2 ; Wang, X.J.^1,2 ; Liu, F.Z.^1,2 ; Ban, C.Y.^1,2 ; Cui, J.Z.^1,2

Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, China^1

School of Materials Science and Engineering, Northeastern University, Shenyang, China^2

关键词: AZ80 magnesium alloy;    Dynamic precipitation;    Dynamic strain aging;    Forging process;    Forging temperature;    Granular shape;    Mg17Al12 phase;    Multidirectional forging;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/194/1/012015/pdf
DOI  :  10.1088/1757-899X/194/1/012015

来源: IOP

【 摘 要 】

Dynamic aging precipitation of Mg17Al12phases in AZ80 magnesium alloy was studied by multi-directional forging (MDF) with decreasing temperatures from 410 to 300 °C. The results show that the morphology of the dynamically precipitated β-Mg17Al12phases (formed during forging process) exhibited granular shape. During the multi-directional forging process, the inhomogeneous dynamic precipitation of the β-Mg17Al12phases result in the coexistence of the fine grains (with many granular Mg17Al12phases) and coarse grains (without Mg17Al12phases) in the samples. The fine grains (with many granular Mg17Al12phases) area expands with the decreasing of final forging temperature. The inhomogenous Al content distribution in the Mg matrix leads to the non-uniform dynamic precipitation of the Mg17Al12phase. These Mg17Al12phase retards the growth of the DRX grains, which in turns results in the formation fine grains area during the during the MDF process with temperature decreasing.