Influence of Heat Treatment on Precipitation Behavior and Mechanical Properties of Extruded AZ80 Magnesium Alloy
来源期刊：Acta Metallurgica Sinica2021年第1期
论文作者：Xi Zhao Fa-Fa Yan Zhi-Min Zhang Peng-Cheng Gao Shu-Chang Li
文章页码：54 - 64
摘 要：By means of annular channel angular extrusion technology and solution treatment,the AZ80 supersaturated solid solution was prepared.The β-Mg17Al12 precipitate morphologies analysis along with its sizes and area fraction measurement was performed to investigate mechanical properties variation of alloy at various aging temperature.The results indicated that after solution treatment,the intergranular precipitate of as-extruded alloy was re-dissolved into the matrix,eff ectively decreasing the stress concentration,which was beneficial to the enhancement of elongation.At aging temperatures of 300 ℃,Widmanstatten structure,lath-shaped precipitate,and intergranular precipitate were observed,while at 175–200 ℃,cellular structure and oval-shaped particle were also identified.The morphology,area fraction,size of the precipitates,and PFZs（precipitate free zones） width worked together to aff ect the age-hardening behavior of the alloy.The strength and hardness of the peak-aged samples decreased with the increase in aging temperature,which is primarily attributed to the reduction in cellular structure area fraction and the corresponding increase in the interlamellar spacing,and the coarsening of the rhombus precipitate.
Xi Zhao1，Fa-Fa Yan2，Zhi-Min Zhang3，Peng-Cheng Gao4，Shu-Chang Li2
1. School of Mechanical and Electrical Engineering,North University of China2. Ningbo Branch of Chinese Academy of Ordnance Science3. Engineering Technology Research Center for Integrated Precision Forming of Shanxi Province4. China Aerodynamics Research and Development Center
摘 要：By means of annular channel angular extrusion technology and solution treatment,the AZ80 supersaturated solid solution was prepared.The β-Mg17Al12 precipitate morphologies analysis along with its sizes and area fraction measurement was performed to investigate mechanical properties variation of alloy at various aging temperature.The results indicated that after solution treatment,the intergranular precipitate of as-extruded alloy was re-dissolved into the matrix,eff ectively decreasing the stress concentration,which was beneficial to the enhancement of elongation.At aging temperatures of 300 ℃,Widmanstatten structure,lath-shaped precipitate,and intergranular precipitate were observed,while at 175–200 ℃,cellular structure and oval-shaped particle were also identified.The morphology,area fraction,size of the precipitates,and PFZs（precipitate free zones） width worked together to aff ect the age-hardening behavior of the alloy.The strength and hardness of the peak-aged samples decreased with the increase in aging temperature,which is primarily attributed to the reduction in cellular structure area fraction and the corresponding increase in the interlamellar spacing,and the coarsening of the rhombus precipitate.
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