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- 2018
短切碳纤维/AZ91D镁合金复合材料高温变形动态再结晶行为
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Abstract:
在变形温度为340~400℃、应变速率为0.001~0.1 s-1、最大真应变为0.7的条件下，采用等温压缩实验研究了短切碳纤维（CFs）/AZ91D复合材料和AZ91D镁合金的动态再结晶行为。结果表明：CFs/AZ91D复合材料和AZ91D镁合金在高温压缩过程中均发生了显著的动态再结晶；CFs极大地促进了AZ91D基体的动态再结晶过程，减小了动态再结晶临界应变并细化了再结晶晶粒组织；AZ91D镁合金动态再结晶体积分数随应变量增加表现为典型的"S"型变化曲线，而CFs/AZ91D复合材料则呈现出快速增长-缓慢增长-趋于平稳的非线性变化规律。根据实验结果分别建立了CFs/AZ91D复合材料和AZ91D镁合金的动态再结晶临界应变模型和动力学模型，在此基础上分析了二者高温变形动态再结晶行为的差异。 The dynamic recrystallization behavior of short carbon fiber(CFs)/AZ91D composite and AZ91D 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/AZ91D composites and Mg alloy exhibit an obvious dynamic recrystallization during being compressed at elevated temperature. The addition of CFs greatly 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/AZ91D composites, 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/AZ91D composite and Mg alloy were developed according to the experimental results. Based on these models, the difference of the dynamic recrystallization behavior between CFs/AZ91D composite and Mg alloy was analyzed. 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）
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