Effect of Initial Microstructure Prior to Extrusion on the Microstructure and Mechanical Properties of Extruded AZ80 Alloy with a Low Temperature and a Low Ratio

Chinese Journal of Mechanical Engineering

Original Article

Ruizhi Wu¹  Dongyue Zhao¹  Boshu Liu²  Haipeng Li²  Rongguang Li²  Shanshan Li²  Hang Zhang² 

[1] Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, Harbin Engineering University, 150001, Harbin, China;School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, 110142, Shenyang, China;

关键词: Magnesium alloy;    Low temperature and low ratio extrusion;    Bimodal grain structure;    Dynamic precipitate;    Dynamic recrystallization;   

DOI  :  10.1186/s10033-023-00901-w

 received in 2022-12-04, accepted in 2023-05-16,  发布年份 2023

来源: Springer

【 摘 要 】

Magnesium (Mg) alloys are the lightest metal structural material for engineering applications and therefore have a wide market of applications. However, compared to steel and aluminum alloys, Mg alloys have lower mechanical properties, which greatly limits their application. Extrusion is one of the most important processing methods for Mg and its alloys. However, the effect of such a heterogeneous microstructure achieved at low temperatures on the mechanical properties is lacking investigation. In this work, commercial AZ80 alloys with different initial microstructures (as-cast and as-homogenized) were selected and extruded at a low extrusion temperature of 220 °C and a low extrusion ratio of 4. The microstructure and mechanical properties of the two extruded AZ80 alloys were investigated. The results show that homogenized-extruded (HE) sample exhibits higher strength than the cast-extruded (CE) sample, which is mainly attributed to the high number density of fine dynamic precipitates and the high fraction of recrystallized ultrafine grains. Compared to the coarse compounds existing in CE sample, the fine dynamical precipitates of Mg17(Al, Zn)12 form in the HE sample can effectively promote the dynamical recrystallization during extrusion, while they exhibit a similar effect on the size and orientation of the recrystallized grains. These results can facilitate the designing of high-strength wrought magnesium alloys by rational microstructure construction.

【 授权许可】

CC BY   
© The Author(s) 2023

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