开发一种高效液态搅拌铸工艺制备AA6061?31%B4C复合材料。研究该工艺的关键参数，并对复合材料的显微组织和力学性能进行表征。结果表明，真空搅拌/浇铸、B4C/Mg 加料方式和铸锭冷却是 AA6061?31%B4C复合材料成功制备的关键参数。化学腐蚀检测结果证实复合材料中含有设计含量的B4C；X射线荧光检测表明，复合材料基体中Mg和Si含量符合工业标准；扫描电镜和X射线衍射结果表明，B4C颗粒均匀分布在基体中，颗粒之间为时效析出的 Mg2Si 相；拉伸结果表明， AA6061?31%B4C 复合材料的抗拉强度为340 MPa ，比AA1100?31%B4C 复合材料的抗拉强度提高了112.5%，这归因于基体铝合金强度的大幅提高。
A sophisticated stir casting route to fabricate large scale AA6061?31%B4C composite was developed. Key process parameters were studied, microstructure and mechanical properties of the composite were investigated. The results indicated that vacuum stirring/casting, B4C/Mg feeding and ingots cooling were essential to the successful fabrication of AA6061?31%B4C composite. Chemical erosion examination verified the designed B4C content; X-ray fluorescence spectrometer (XFS) showed the chemical composition of Mg and Si in the matrix conformed to industry standards;scanning electronic microscope (SEM) and X-ray diffraction (XRD) revealed that B4C particles were evenly distributed in the composites with well dispersed Mg2Si precipitates. Tensile testing results showed that the AA6061?31%B4C composite had a tensile strength of 340 MPa, improved by 112.5%compared with AA1100?31%B4C composite, which is attributed to the enhanced strength of the matrix alloy.
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