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首页> 外文期刊>Journal of Materials Engineering and Performance >Bending Properties and Failure Mechanism of Continuous W-Core-SiC Fiber-Reinforced 2024 and 6061 Aluminum Matrix Composites
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Bending Properties and Failure Mechanism of Continuous W-Core-SiC Fiber-Reinforced 2024 and 6061 Aluminum Matrix Composites

机译：连续W芯纤维增强2024和6061铝基复合材料的弯曲性能和故障机理

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摘要

In order to investigate the effect of different matrices on the bending properties and fracture behavior of the continuous W-core-SiC fiber-reinforced aluminum matrix (SiCf/Al) composites, 30 vol.% SiCf/2024Al and 30 vol.% SiCf/6061Al composites were prepared via matrix coating and hot isostatic pressing. Samples from these composites were subjected to the push-out test and three-point bending test with in situ SEM. The microstructure of the SiCf/Al composites was examined by SEM and TEM. Results showed that there were coarse AlCuFeMn and Al2Cu phases in the matrix of the SiCf/2024Al composite, and needle-like Al(4)C(3)phase at the interface between fiber and matrix. For the SiCf/6061Al composite, there were no coarse second phase in the matrix and no Al(4)C(3)phase at the interface between fiber and matrix. The interfacial shear strength of the SiCf/2024Al composite (similar to 37 MPa) was relatively larger than that of the SiCf/6061Al composite (similar to 34 MPa), indicating a relatively strong interface bonding for the SiCf/2024Al composite. The bending strength of the SiCf/6061Al composite (1091 MPa) was superior to that of the SiCf/2024Al composite (968 MPa). For 30 vol.% SiCf/2024Al composite, cracks were initiated at the edge of the coarse second phase under bending load and propagated along the grain boundary of matrix. The crack passed directly through SiC fibers due to the strong interface bonding and needle-like Al(4)C(3)phases formed by interfacial reaction, and the propagation rate was fast. For 30 vol.% SiCf/6061Al composite, the crack was initiated at the interface between fiber and matrix when the plastic deformation of matrix was retarded at the first SiC fiber. Then, the crack passed around SiC fibers and propagated in forms of crack bridging and deflection due to the suitable interface bonding, and the propagation rate was slow.
机译：为了研究不同基体对连续W芯SiC纤维增强铝基（SiCf/Al）复合材料弯曲性能和断裂行为的影响，通过基体涂层和热等静压制备了体积分数为30%的SiCf/2024Al和体积分数为30%的SiCf/6061Al复合材料。用原位扫描电镜对这些复合材料的样品进行了推出试验和三点弯曲试验。通过SEM和TEM观察了SiCf/Al复合材料的微观结构。结果表明，SiCf/2024Al复合材料基体中存在粗AlCuFeMn和Al2Cu相，纤维与基体界面存在针状Al（4）C（3）相。对于SiCf/6061Al复合材料，基体中没有粗大的第二相，纤维与基体的界面上也没有Al（4）C（3）相。SiCf/2024Al复合材料（类似于37 MPa）的界面剪切强度相对大于SiCf/6061Al复合材料（类似于34 MPa），表明SiCf/2024Al复合材料的界面结合相对较强。SiCf/6061Al复合材料（1091mpa）的抗弯强度优于SiCf/2024Al复合材料（968mpa）。对于体积分数为30%的SiCf/2024Al复合材料，在弯曲载荷下，裂纹在粗第二相边缘萌生，并沿基体晶界扩展。界面反应形成针状Al（4）C（3）相，界面结合力强，裂纹直接穿透SiC纤维，扩展速度快。对于体积分数为30%的SiCf/6061Al复合材料，当基体的塑性变形在第一根SiC纤维处受阻时，裂纹在纤维与基体的界面处萌生。然后，由于合适的界面结合，裂纹在SiC纤维周围以裂纹桥接和偏转的形式扩展，扩展速度较慢。

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