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首页> 外文期刊>Metals >Microstructures and Tensile Properties of Al–Cu Matrix Composites Reinforced with Nano-Sized SiCp Fabricated by Semisolid Stirring Process
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Microstructures and Tensile Properties of Al–Cu Matrix Composites Reinforced with Nano-Sized SiCp Fabricated by Semisolid Stirring Process

机译：半固态搅拌法制备纳米SiCp增强Al-Cu基复合材料的组织和拉伸性能

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摘要

The nano-sized SiCp/Al–Cu composites were successfully fabricated by combining semisolid stirring with ball milling technology. Microstructures were examined by an olympus optical microscope (OM), field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM). Tensile properties were studied at room temperature. The results show that the α-Al dendrites of the composites were strongly refined, especially in the composite with 3 wt. % nano-sized SiCp, of which the morphology of the α-Al changes from 200 μm dendritic crystal to 90 μm much finer equiaxial grain. The strength and ductility of the composites are improved synchronously with the addition of nano-sized SiCp particles. The as-cast 3 wt. % nano-sized SiCp/Al–Cu composite displays the best tensile properties, i.e., the yield strength, ultimate tensile strength (UTS) and fracture strain increase from 175 MPa, 310 MPa and 4.1% of the as-cast Al–Cu alloy to 220 MPa, 410 MPa and 6.3%, respectively. The significant improvement in the tensile properties of the composites is mainly due to the refinement of the α-Al dendrites, nano-sized SiCp strengthening, and good interface combination between the SiCp and Al–Cu alloys.
机译：通过将半固态搅拌与球磨技术相结合，成功地制备了纳米级SiCp / Al-Cu复合材料。通过奥林巴斯光学显微镜（OM），场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）检查微观结构。在室温下研究拉伸性能。结果表明，复合材料的α-Al枝晶得到了强烈的细化，特别是在3 wt。％的复合材料中。 ％纳米尺寸的SiCp，其中α-Al的形态从200μm的枝晶转变为90μm的更细的等轴晶粒。通过添加纳米尺寸的SiCp颗粒，可以同时提高复合材料的强度和延展性。铸态3重量％。 ％纳米尺寸SiCp / Al-Cu复合材料表现出最佳的拉伸性能，即屈服强度，极限拉伸强度（UTS）和断裂应变分别从175 MPa，310 MPa和铸态Al-Cu合金的4.1％增长分别达到220 MPa，410 MPa和6.3％。复合材料拉伸性能的显着改善主要是由于α-Al树枝状晶体的细化，纳米级SiCp的增强以及SiCp与Al-Cu合金之间的良好界面组合。

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