(北京科技大学 材料科学与工程学院，北京 100083)
摘 要: 850 ℃下在真空熔炼炉中通过液态铝与无定形硼粉之间的化学反应，原位合成AlB2-Al复合材料。研究该铝基复合材料经过热轧和固溶处理后显微组织与力学性能的变化。分别利用扫描电镜(SEM)、光学电镜和X射线衍射仪(XRD)对合成复合材料的显微组织和物相组成进行分析，并采用室温下的拉伸实验确定AlB2-Al复合材料的力学性能。结果表明：由于在铝基体中生成了高纵横比的AlB2薄片，复合材料的硬度与抗拉强度明显高于纯铝基体的，但其塑性降低。经固溶处理后，AlB2-Al复合材料的伸长率可达26%以上。
关键字: AlB2-Al；原位复合材料；热轧；固溶处理；力学性能
（School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China）
Abstract:In-situ AlB2-Al composite was synthesized by chemical reaction between liquid aluminum and amorphous boron powder at 850 ℃ in vacuum melting furnace. The changes of microstructure and mechanical properties of this aluminum matrix composite after hot-rolling and solution treatment were studied. Scanning electron microscopy (SEM), optical microscopy and X-ray diffraction (XRD) were used to investigate the morphology and phase composition of the composite. The mechanical properties of AlB2-Al composite were determined by the tensile test at room temperature. The results show that the AlB2 flakes with high aspect ratio form in Al matrix, therefore, the micro-hardness and tensile strength of the composite are significantly higher than those of pure aluminum, but the ductility of matrix is reduced. And the elongations of composites can reach more than 26% after solution treatment.
Key words: AlB2-Al; in-situ composite; hot-rolling; solution treatment; mechanical property
