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《Acta Materiae Compositae Sinica》 2018-06
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Dynamic recrystallization behavior of short carbon fiber/AZ91D Mg alloy composite during compression at evaluated temperature

HUANG Biao;WANG Zhenjun;QIU Xudong;YU Huan;XU Zhifeng;Key Discipline Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University;Xiangyang Hangtai Power Machinery Factory;  
The dynamic recrystallization behavior of short carbon fiber(CFs)/AZ91 Dcomposite and AZ91 D Mg alloy was investigated by isothermal compressive experiment at the deformation temperatures from 340℃to 400℃,strain rates from 0.001 s-1 to 1 s-1 and a maximum true strain of 0.7.The results show that both CFs/AZ91 D composites and Mg alloy exhibit an obvious dynamic recrystallization during being compressed at elevated temperature.The addition of CFsgreatly promotes the dynamic recrystallization of the matrix alloy in the composite.As a result,the critical strain for dynamic recrystallization is reduced and a finer recrystallized grain structure is obtained in the composite.For the Mg alloy,the variation of volume fraction of dynamic recrystallization with the strain presents the classical"S"mode.For the CFs/AZ91 Dcomposites,however,the increase of volume fraction of dynamic recrystallization with the increase of strain exhibits a rapid-slow-stable behavior.The dynamic recrystallization critical strain and kinetics models of CFs/AZ91 Dcomposite and Mg alloy were developed according to the experimental results.Based on these models,the difference of the dynamic recrystallization behavior between CFs/AZ91 Dcomposite and Mg alloy was analyzed.
【Fund】: 国家自然科学基金(51365043;51765045);; 江西省自然科学基金(20171BAB201021);; 江西省教育厅科学技术研究基金(GJJ1607055);; 江西省研究生创新专项基金(YC2015S319)
【CateGory Index】: TB333
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