Superplasticity in Friction Stir Processed AZ80 Magnesium Alloy
Superplasticity in Friction Stir Processed AZ80 Magnesium Alloy
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DOI：
10.4028/www.scientific.net/kem.433.241
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发表时间：
2010-03
期刊：
影响因子：
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通讯作者：
Y. Takayama;Itsuki Takeda;T. Shibayanagi;H. Kato;K. Funami
中科院分区：
文献类型：
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作者：
Y. Takayama;Itsuki Takeda;T. Shibayanagi;H. Kato;K. Funami
研究了AZ80镁合金在搅拌摩擦加工过程中的超塑性。在150mm/min和300mm/min两种移动速度下进行FSP以细化晶粒。在加工方向上的横截面上的光学显微镜显示在两个行进速度下的搅拌区之间的尺寸和特征的明显差异。室温下，FSP处理样品的硬度比原始样品的硬度高30HV左右。与573K和673K下的原始试样相比，在较低的应变速率下，FSPed试样的最大应力显著降低。另一方面，在573K和低应变速率下，FSPed样品的断裂伸长率比原始样品的断裂伸长率大10至13倍。通过扫描电子显微镜进一步观察了断口附近的表面形貌，探讨了高温下的变形机制。
Superplasticity in an AZ80 magnesium alloy subjected to friction stir processing (FSP) has been investigated. FSP was carried out at two traveling speeds of 150mm/min and 300mm/min for grain refinement. Optical microscopy on cross section to processing direction revealed obvious differences in size and feature between the stir zones at the two traveling speeds. The hardness of FSPed sample at the room temperature was about 30HV higher than that of as-received one. The maximum stress of the FSPed sample was reduced remarkably at lower strain rates compared with those of the as-received one at 573K and 673K. On the other hand, the elongation to failure of the FSPed sample showed ten to thirteen times larger than that of the as-received one at 573K and low strain rates. Further surface morphology near the fracture tip was observed by scanning electron microscopy to discuss deformation mechanism at high temperatures.