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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

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Chinese Journal of Mechanical Engineering 2023年第3期36卷 339-349页

作者： Hang Zhang Haipeng Li Rongguang Li Boshu Liu Ruizhi Wu Dongyue Zhao Shanshan Li School of Mechanical and Power Engineering Shenyang University of Chemical TechnologyShenyang 110142China Key Laboratory of Superlight Materials&Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001China

Magnesium(Mg)alloys are the lightest metal structural material for engineering applications and therefore have a wide market of ***,compared to steel and aluminum alloys,Mg alloys have lower mechanical properties,which greatly limits their *** is one of the most important processing methods for Mg and its ***,the effect of such a heterogeneous microstructure achieved at low temperatures on the mechanical properties is lacking *** 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℃and a low extrusion ratio of *** microstructure and mechanical properties of the two extruded AZ80 alloys were *** 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 *** to the coarse compounds existing in CE sample,the fine dynamical precipitates of Mg17(Al,Zn)12form 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 *** results can facilitate the designing of high-strength wrought magnesium alloys by rational microstructure construction.

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

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