CAJ | 학술논문

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。
통과자화학용체반응법재7055(Al?3%B)?Ti반응체계중성공제비TiB2/7055복합재료。이용XRD、OM화SEM등분석검측기술연구복합재료적상조성화미관조직。결과표명，맥충자장작용하생성적TiB2과립정다변상혹근구형，척촌소우1μm，균균분포우기체중。여미시가맥충자장적복합재료상비，시가자장후α(Al)정립평균척촌종20μm감소도약10μm，제이상종련속적망격상분포변위비련속성분포。재자장작용하，복합재료적항랍강도종310 MPa제고도333 MPa，신장솔종7.5%제고도8.0%。차외，여기체상비，재재하위100 N，마손시간위120 min시，복합재료적마손량종111 mg강저도78 mg。
In situ TiB2/7055 composites were successfully synthesized via magnetic chemical direct melt reaction from 7055 (Al?3B)?Ti system. The phase composition and the microstructure of the composites were investigated by XRD, OM and SEM technologies, and the mechanical and wear properties were tested. The results indicate that with the pulsed magnetic field assistance, the morphologies of in situ TiB2 particles are mainly hexagonal-shape or nearly spherical, the sizes are less than 1 μm, and the distribution of the matrix is uniform. Compared the microstructures of the 7055 aluminum matrix composites synthesized without pulsed magnetic field, the average size ofα(Al) phase with pulsed magnetic field assistance is decreased from 20 to 10μm, the array of the second phase is changed from continuous net-shape to discontinuous shape. With the pulsed magnetic field, the tensile strengths of the composites are enhanced from 310 to 330 MPa, and the elongations are increased from 7.5%to 8.0%. In addition, compared with matrix alloy, the wear mass loss of the composites is decreased from 111 to 78 mg under a load of 100 N for 120 min.