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Evolution of microstructure and hardness in aluminum processed by High Pressure Torsion Extrusion

机译：高压扭力挤压铝材组织和硬度的演变

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摘要

An investigation was conducted on aluminum samples (AA1050) to study the microstructure and hardness evolution during processing by High Pressure Torsion Extrusion (HPTE). The equivalent strain accumulated in the samples after one pass of HPTE varied in a wide range between 0.9 and 65.5, depending on the processing parameters. HPTE led to the formation of a gradient microstructure in which the grain size decreased by increasing the distance from the central axis of the billets. This gradient decreased significantly by increasing the ratio of rotational speed to extrusion speed. Most of the grain refinement and hardness-increase occurred up to the equivalent strain of similar to 5 but saturation level was achieved at the strain of similar to 20. Saturation levels in grain size and hardness were similar to 0.7 mu m and similar to 67 HV, respectively. HPTE technique can provide similar saturation in microstructure and hardness as those obtained by HPT but in much larger samples. Therefore, HPTE can be a named as a suitable candidate for practical applications to produce bulk ultrafine-grained materials with considerable enhancement in hardness.
机译：对铝样品（AA1050）进行了研究，以研究高压扭转挤压（HPTE）加工过程中的显微组织和硬度演变。经过一轮HPTE后，样品中累积的等效应变在0.9到65.5之间的较大范围内变化，具体取决于处理参数。 HPTE导致形成梯度微结构，其中通过增加与钢坯中心轴的距离来减小晶粒尺寸。通过增加旋转速度与挤压速度之比，该梯度显着降低。大部分晶粒细化和硬度增加达到了接近5的等效应变，但在接近20的应变下达到了饱和水平。晶粒尺寸和硬度的饱和水平类似于0.7微米，类似于67 HV ， 分别。 HPTE技术可以在微观结构和硬度上提供与HPT相似的饱和度，但是在更大的样品中。因此，可以将HPTE命名为实际应用的合适候选者，以生产硬度显着提高的块状超细颗粒材料。

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