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为研究应变速率及温度对2519A铝合金流变应力的影响,对2519A铝合金进行动态力学性能测试及准静态拉伸实验,结合光学显微镜及透射显微电镜分析应变速率及温度对微观组织演化的影响。研究结果表明:2519A铝合金具有应变速率效应及温度敏感性。采用变量分离与非线性拟合方法对准静态及霍普金森压杆(SHPB)实验数据进行拟合,得到2519A铝合金的Johnson-Cook本构模型参数,曲线拟合与实验结果吻合较好,为力学性能的研究及抗弹性能有限元分析提供了参考。
In order to study the effect of strain rate and temperature on the flow stress of 2519A aluminum alloy, the dynamic mechanical properties and quasi-static tensile test of 2519A aluminum alloy were studied. The effects of strain rate and temperature on microstructure evolution were analyzed by optical microscope and transmission electron microscopy influences. The results show that: 2519A aluminum alloy with strain rate effect and temperature sensitivity. The parameters of Johnson-Cook constitutive model of 2519A aluminum alloy were obtained by fitting static and Hopkinson pressure bar (SHPB) data with variable separation and non-linear fitting methods. The curve fitting is in good agreement with the experimental results, It provides a reference for the study of mechanical properties and the analysis of the anti-ballistic performance of the finite element analysis.