Influence of cross-rolling on the mechanical properties of an accumulative roll bonded aluminum alloy AA6014
Influence of cross-rolling on the mechanical properties of an accumulative roll bonded aluminum alloy AA6014
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DOI：
10.1016/j.msea.2013.12.075
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发表时间：
2014-03
期刊：
影响因子：
6.4
通讯作者：
M. Ruppert;H. Höppel;M. Göken
中科院分区：
文献类型：
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作者：
M. Ruppert;H. Höppel;M. Göken
AA6014 （AlMgSi）铝板成功地从T4状态累积轧制粘合到8次循环。使用传统的ARB路线，一方面在室温下进行加工。另一方面，在每个轧制步骤之前，板材在210°C的炉中预热2.5分钟。在室温下，除了常规的ARB路线外，还采用了ARB交叉轧制路线，在每个周期后轧制方向旋转约90°。在这三种加工条件下均获得了超细晶组织。由于应变路径的改变，横轧AA6014的极限抗拉强度和屈服强度均超过常规ARB处理的试样。然而，与预热ARB板材相比，经过6-8次ARB循环后，伸长率明显下降。断裂分析表明，在室温下处理的样品，个别层的颈缩。因此，在高温下进行7次交叉轧制后，进行最后一次高温交叉轧制，以提高粘接质量。这导致了475 MPa的高强度和10%的令人满意的断裂伸长率。
Sheets of aluminum AA6014 (AlMgSi) were successfully accumulative roll bonded from T4 condition up to eight cycles. Using the conventional ARB route, processing was on the one hand performed at room temperature. On the other hand, sheets were pre-heated in a furnace for 2.5 min at 210 °C prior to each rolling step. Besides the conventional ARB route an ARB cross-rolling route, where the rolling direction is rotated around 90° after each cycle, was used at room temperature. For all three processing conditions an ultrafine-grained microstructure was obtained. Due to a change in strain path, the ultimate tensile strength and the yield strength of the cross-rolled AA6014 exceed those of the samples processed by conventional ARB. However, a strong decrease in terms of elongation to failure is visible after 6–8 cycles of ARB compared to the pre-heated ARB sheets. Fracture analysis reveals necking of individual layers for the samples processed at room temperature. Therefore, after 7 cycles of cross-rolling at RT, one last cross-rolling step at elevated temperature was performed in order to improve bonding quality. This leads to a high strength of about 475 MPa and a satisfactory elongation to failure of about 10%.