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首页> 外文期刊>Materials Science Research International >Interfacial microstructure and fracture characterization of Al{sub}18B{sub}4O{sub}33/Al alloy composites
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Interfacial microstructure and fracture characterization of Al{sub}18B{sub}4O{sub}33/Al alloy composites

机译：Al {sub} 18B {sub} 4O {sub} 33 / Al复合材料的界面组织和断裂特性

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摘要

In order to investigate the relationship between the mechanical properties and the microstructure of aluminum borate (Al{sub}18B{sub}4O{sub}33) whisker reinforced Al-1% Mg alloy composites fabricated by the squeeze casting process, the microstructure and fractured structure were observed by scanning and transmission electron microscopy (SEM and TEM). The interface between the matrix and whisker in an as-cast composite is smooth. By heat treatment at 550℃ for 2h, the MgAl{sub}2O{sub}4 reaction layer with a spinel structure is produced at the whisker/matrix interface and appears trapezoidal. The interface between Al{sub}18B{sub}4O{sub}33 and MgAl{sub}2O{sub}4 has a certain preferred orientation with very little mismatch. Cracks tend to propagate along the whisker/matrix and reaction product/matrix interfaces. The interface between the whisker and reaction product seems to have good bonding strength. There are many microcracks in the whiskers in fractured composites, which propagate along the (001) plane in the whisker. Many dislocations and strain fields were observed in the matrix around the reaction products. The bending strength decreases with increasing amount of reaction product. The degradation of the composite strength by heat treatment is caused by weakening of the strength of the interface between the reaction product and matrix or strain concentration at the convexity formed by the interfacial reaction.
机译：为了研究通过挤压铸造法制备的硼酸铝（Al {sub} 18B {sub} 4O {sub} 33）晶须增强的Al-1％Mg合金复合材料的力学性能与微观结构之间的关系，其微观结构和通过扫描和透射电子显微镜（SEM和TEM）观察到断裂的结构。铸态复合材料中基体和晶须之间的界面光滑。通过在550℃下热处理2h，在晶须/基体界面处产生具有尖晶石结构的MgAl {sub} 2O {sub} 4反应层，并呈梯形。 Al {sub} 18B {sub} 4O {sub} 33和MgAl {sub} 2O {sub} 4之间的界面具有一定的首选方向，几乎没有错配。裂纹倾向于沿着晶须/基体和反应产物/基体界面传播。晶须和反应产物之间的界面似乎具有良好的粘合强度。断裂的复合材料中，晶须中有许多微裂纹，它们沿着晶须的（001）平面传播。在反应产物周围的基质中观察到许多位错和应变场。弯曲强度随着反应产物量的增加而降低。通过热处理使复合强度降低是由于反应产物与基体之间的界面强度减弱或在由界面反应形成的凸面处的应变浓度降低。

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