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通过磁化学熔体反应法在7055(Al 3%B)Ti反应体系中成功制备TiB2/7055复合材料。利用XRD、OM和SEM等分析检测技术研究复合材料的相组成和微观组织。结果表明,脉冲磁场作用下生成的TiB2颗粒呈多边状或近球形,尺寸小于1μm,均匀分布于基体中。与未施加脉冲磁场的复合材料相比,施加磁场后α(Al)晶粒平均尺寸从20μm减小到约10μm,第二相从连续的网格状分布变为非连续性分布。在磁场作用下,复合材料的抗拉强度从310 MPa提高到333 MPa,伸长率从7.5%提高到8.0%。此外,与基体相比,在载荷为100 N,磨损时间为120 min时,复合材料的磨损量从111 mg降低到78 mg。
The TiB2 / 7055 composite was successfully prepared by magnetization melt reaction in 7055 (Al 3% B) Ti reaction system. The phase composition and microstructure of the composites were investigated by XRD, OM and SEM. The results show that the TiB2 particles generated by the pulsed magnetic field are polygonal or nearly spherical with the size less than 1μm and uniformly distributed in the matrix. Compared with the composite material without pulsed magnetic field, the average size of α (Al) grains decreased from 20μm to about 10μm after the magnetic field was applied, and the second phase changed from continuous lattice distribution to discontinuous distribution. Under the action of magnetic field, the tensile strength of the composites increased from 310 MPa to 333 MPa, and the elongation increased from 7.5% to 8.0%. In addition, compared with the matrix, the wear loss of the composites decreased from 111 mg to 78 mg at 100 N load and 120 min wear time.