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首页> 外文期刊>Materials Science and Engineering >Bake hardening behavior and precipitation kinetic of a novel Al-Mg-Si-Cu aluminum alloy for lightweight automotive body
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Bake hardening behavior and precipitation kinetic of a novel Al-Mg-Si-Cu aluminum alloy for lightweight automotive body

机译：新型Al-Mg-Si-Cu铝合金轻量化车身的烘烤硬化行为和析出动力学

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摘要

The natural aging (NA) phenomena and its negative effect on bake hardening (BH) response, and a wide temperature/time range of pre-aging (PA) treatment on a novel Al-Mg-Si-Cu automotive aluminum alloy were investigated systematically by micro-hardness measurement, tensile test, transmission electron microscopy (TEM) and differential scanning calorimetry (DSC) analysis. The precipitation kinetic of main strengthening beta '' phase was calculated according DSC curves based on JMA (Johnson-Mehl-Avrami) equation. The results indicate that artificial aging (AA) immediately after solution treatment is helpful to achieve good BH response, while aging temperature and time determine the value and arrival time of peak hardness. BH value is decreased with increase of NA time. BH value is ranging from 40 MPa to 110 MPa after different PA treatment, and the optimal one is obtained while PA at 160 degrees C for 10 min. The precipitation activation energy of beta '' phase of T4P state (160 degrees C/10 min) is reduced about 42 kJ/mol compared to T4 state, which is attributed to the increase of GP region size during PA treatment.
机译：系统研究了新型Al-Mg-Si-Cu汽车铝合金的自然时效（NA）现象及其对烘烤硬化（BH）响应的负面影响以及宽广的温度/时间范围的预时效（PA）处理通过显微硬度测量，拉伸试验，透射电子显微镜（TEM）和差示扫描量热法（DSC）分析。根据JMA（Johnson-Mehl-Avrami）方程根据DSC曲线计算出主要强化β''相的沉淀动力学。结果表明，固溶处理后立即进行人工时效（AA）有助于获得良好的BH响应，而时效温度和时间决定了峰值硬度的值和到达时间。随着NA时间的增加，BH值降低。经过不同的PA处理后，BH值在40 MPa至110 MPa的范围内，而最佳PA值则是在160摄氏度下PA处理10分钟时获得的。与T4状态相比，T4P状态的β''相（160摄氏度/ 10分钟）的沉淀活化能降低了约42 kJ / mol，这归因于PA处理期间GP区域尺寸的增加。

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