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Processing maps for hot deformation of the extruded 7075 aluminum alloy bar: Anisotropy of hot workability

机译：挤压7075铝合金棒材热变形的加工图：热加工性的各向异性

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The flow stress behavior of 7075 aluminum alloy was investigated by carrying out hot-compression tests on extruded bars with loading directions at 0°, 45° and 90° to the axis of the bars, which were, respectively, named 0°, 45° and 90° specimens. The tests were undertaken using a Gleeble-1500 thermal simulation machine in the temperatures range of 320-480 ℃ and strain rates range of 0.001-1 s~(-1) The resulting microstructures were examined and the crystal textures were analyzed. It was found that the flow stresses for the 0° specimens were always the highest and those for the 45° specimens the lowest. The apparent activation energy for 0°, 45° and 90° specimens were calculated to be 143.4 kJ mol~(-1), 147.4 kJ mol~(-1) and 146.5 kJ mol~(-1) respectively, which is close to that for lattice self-diffusion (142 kJ mol~(-1)) for pure aluminum. The processing maps for all specimen orientations were built at a strain of 0.7. The main characteristic of the three power dissipation maps were found to be similar. There was one instability deformation domain in the temperature range of 320-340 ℃ and strain rate range of 0.18-1 s~(-1) for the 0° and 90° specimens, while no instability deformation domain was observed for the 45° specimens. According to the processing maps and microstructural observations, the optimum hot-working parameters for the extruded 7075 alloy bars of all the three orientations were determined to be at a temperature of 480 ℃ and at a strain rate of 0.1 s~(-1). The characteristics of the flow stresses and deformation maps were explained in terms of the elongated grains and the texture.
机译：通过对挤压方向为0°，45°和90°的挤压棒材进行热压缩试验，研究了7075铝合金的流变应力行为，分别命名为0°，45°和90°标本。使用Gleeble-1500热模拟机在320-480℃的温度范围和0.001-1 s〜（-1）的应变速率范围内进行了测试。检查了所得的微结构并分析了晶体织构。结果发现，0°试样的流应力始终最高，而45°试样的流应力最低。计算出0°，45°和90°样品的表观活化能分别为143.4 kJ mol〜（-1），147.4 kJ mol〜（-1）和146.5 kJ mol〜（-1），接近纯铝的晶格自扩散（142 kJ mol〜（-1））。所有样品方向的加工图都是在0.7应变下建立的。发现三个功耗图的主要特征相似。 0°和90°试样在320-340℃温度范围内有一个失稳变形域，应变率范围为0.18-1 s〜（-1），而45°试样没有观察到失稳形变域。 。根据工艺图和显微组织观察，确定了这三种取向的挤压7075合金棒材的最佳热加工参数为480℃的温度和0.1s〜（-1）的应变速率。根据拉长的晶粒和织构解释了流动应力和变形图的特征。

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