6013-T4铝合金不同温度下的动态流变应力及组织演变

发布时间：2018-05-15 09:13

本文选题：铝合金 + 动态压缩　；参考：《材料导报》2017年10期

【摘要】：采用分离式霍普金森(SHPB)压杆装置进行6013-T4铝合金动态压缩试验,获得温度为25℃、100℃、200℃、300℃、400℃,应变速率为1 000s~(-1)、2 000s~(-1)、3 000s~(-1)、4 000s~(-1)、5 000s~(-1)条件下材料的真应力-真应变曲线,并通过透射电子显微镜(TEM)观测了6013-T4铝合金在不同变形条件下的组织演变。结果表明:6013铝合金有明显的温度敏感性,但是对应变速率的敏感性较弱。应变速率和温度对6013铝合金微观组织的影响显著,位错密度随应变速率的升高而增大,随温度的升高而减小。基于实验数据,求得了6013铝合金Johnson-Cook模型的本构参数并建立其本构模型。与实验结果进行对比,结果表明,所建立的本构模型能够很好地预测6013铝合金的流变应力。
[Abstract]:The dynamic compression test of 6013-T4 aluminum alloy was carried out by the separation Hopkinson (SHPB) pressure rod device, and the true stress - true strain curves of the materials under the conditions of temperature of 25, 100, 200, 300, 400, 1 000s~ (-1), 2 000s~ (-1), 3 000s~ (-1), 4 000s~ (-1), 5 000s~ (-1), were observed by the transmission electron microscope. The microstructure evolution of 13-T4 aluminum alloy under different deformation conditions shows that 6013 aluminum alloy has obvious temperature sensitivity, but the sensitivity of the corresponding strain rate is weak. The strain rate and temperature have significant influence on the microstructure of 6013 aluminum alloy. The dislocation density increases with the increase of the strain rate, and decreases with the increase of temperature. The constitutive parameters of the 6013 aluminum alloy Johnson-Cook model are obtained and the constitutive model is established. The results are compared with the experimental results. The results show that the established constitutive model can predict the rheological stress of 6013 aluminum alloy well.

【作者单位】：湖南大学汽车车身先进设计制造国家重点实验室;湖南大学机械与运载工程学院;
【分类号】：TG146.21

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