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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Shear deformation at 29% solid during solidification of magnesium alloy AZ91 and aluminium alloy A356
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Shear deformation at 29% solid during solidification of magnesium alloy AZ91 and aluminium alloy A356

机译：镁合金AZ91和铝合金A356凝固过程中固含量为29％时的剪切变形

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摘要

Partially solid commercial Al-Si and Mg-Al alloys have been deformed in shear during solidification using vane rheometry. The dendritic mush was deformed for a short period at 29% solid and allowed to cool naturally after deformation. Both alloys exhibited yield point behaviour and deformation was highly localised at the surface of maximum shear stress. The short period of deformation was found to have a distinct impact on the as-cast microstructure leading to fragmented dendrites in the deformation region of both alloys. In the case of the Mg-Al alloy, a concentrated region of interdendritic porosity was also observed in the deformation region. Concentrated porosity was not observed in the Al-Si alloy.
机译：使用叶片流变仪，在凝固过程中，部分固态的商用Al-Si和Mg-Al合金在剪切过程中变形。树枝状糊状物在29％的固含量下短时间变形，变形后自然冷却。两种合金均表现出屈服点行为，并且变形高度集中在最大剪切应力的表面。发现短时间的变形对铸态组织有明显影响，导致两种合金变形区域中的树枝状晶体碎裂。在Mg-Al合金的情况下，在变形区域中也观察到树突间孔隙的集中区域。在Al-Si合金中未观察到集中的孔隙率。

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