Abstract

The microstructure evolution and creep fracture mechanism of Al₂O_3f/Mg-6Al-0.5Nd-1Gd at different creep stages have been investigated by high temperature creep apparatus, X-ray diffraction analysis, and scanning electron microscopy. The results show that the composite is composed of α-Mg, β-Mg₁₇Al₁₂, Al₂O₃, Mg₂Si, Al₂Nd, and Al₂Gd. MgO was generated on the fiber surface as a transition layer. According to the creep test results, the composites are suitable for working conditions below 110 MPa at 200 °C. The creep fracture mode of the composites depends on the interfacial bonding conditions between the matrix alloy and fiber, and the fracture mechanism is a combination of interfacial debonding and fiber fracture.

摘要

采用高温蠕变仪、X射线衍射分析和扫描电镜研究了Al ₂ O _3f /Mg-6Al-0.5Nd-1Gd在不同蠕变阶段的显微组织演变和蠕变断裂机理。结果表明，该复合材料由α-Mg、β-Mg ₁₇ Al ₁₂、Al ₂ O ₃、Mg ₂ Si、Al ₂ Nd、Al _2组成。钆。MgO作为过渡层在纤维表面生成。根据蠕变试验结果，复合材料适用于200℃、110MPa以下的工况。复合材料的蠕变断裂方式取决于基体合金与纤维的界面结合条件，断裂机理是界面脱粘和纤维断裂的结合。