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首页> 外文会议>THERMEC 2011;International conference on processing manufacturing of advanced materials >Friction Stir Processing of the Magnesium alloy AZ61: Grain Size Refinement and Mechanical Properties
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Friction Stir Processing of the Magnesium alloy AZ61: Grain Size Refinement and Mechanical Properties

机译：镁合金AZ61的搅拌摩擦加工：晶粒细化和力学性能

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摘要

The effect of friction stir processing (FSP), on the microstructure and mechanical properties of a magnesium alloy AZ61 has been analyzed. This is a widely used wrought magnesium alloy provided in the form of rolled and annealed sheets with a grain size of 45 μm. The FSP was performed with an adequate cooling device in order to increase the heat extraction and reduce the processing temperature. The final microstructure showed a noticeable grain size refinement down to values close to 1.8 μm and an important change in texture. The change in texture favors basal slip during tensile testing leading to an increase of ductility and a decrease in yield stress. The stability of the grain size and the creep behavior at high temperatures were investigated. The optimum conditions for superplastic forming were determined; however, the presence of a large amount of cavities precludes the achievement of high superplastic elongations. Additionally, these results are compared with those obtained by severe hot rolling.
机译：分析了搅拌摩擦加工（FSP）对镁合金AZ61的组织和力学性能的影响。这是一种广泛使用的锻造镁合金，以轧制和退火板的形式提供，晶粒尺寸为45μm。 FSP使用适当的冷却设备执行，以增加热量提取并降低处理温度。最终的显微组织显示出明显的晶粒细化，细化至接近1.8μm的值，并且组织发生了重要变化。拉伸试验期间，质地的变化有利于基底滑移，从而导致延展性的增加和屈服应力的减小。研究了晶粒尺寸的稳定性和高温下的蠕变行为。确定了超塑性成形的最佳条件;然而，大量的孔洞的存在妨碍了高超塑性伸长率的实现。另外，将这些结果与通过严格的热轧获得的结果进行比较。

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