【摘要】 用光学显微镜和透射电镜对液固原位反应-液态搅拌法制备的Al3Ti-TiB2-SiCp/Al13Si2CuNiMg混杂增强铝基复合材料(简记为ATS/Al)的显微组织特征进行了观察分析,用MTS800电液伺服试验机测定了T6热处理态该复合材料室温和350℃时的拉伸性能,并与基体合金的组织与性能进行了对比。结果表明,ATS/Al复合材料的Al晶粒和初生Si尺寸明显减小,Al基体中的位错密度增大。原位反应生成的TiB2尺寸细小(约为1μm),与Al晶体间存在[011-]Al∥[010]TiB2位向关系。ATS/Al复合材料的室温与350℃拉伸断裂强度分别提高到375 MPa和175 MPa,比基体合金提高了10%和20%,而延伸塑性接近基体合金。本文对原位反应-液态搅拌法ATS/Al复合材料的多机制协同增强机理进行了讨论。更多还原

【Abstract】 The microstructure characteristics of the Al₃Ti-TiB₂-SiC/Al13SiCuNiMg（noted as ATS/Al）,fabricated by the In situ-Melt Stirring process, was studied using optical microscopy（OM） and transmission electron microscopy（TEM）.The tensile properties at room temperature and at 350 ℃ of T6 heat treated ATS/Al were tested using MTS800 machine, and were compared with the matrix alloy under the same condition. The results show that both α-Al grain and primary Si size decreased substancially and dislocation density in the ATS/Al composite increased dramatically compared with the matrix aluminium alloy. A coherient crystal orientation ralationship of _Al∥_TiB2 was found existing between in-situ reinforcement（less than 1 μm） and aluminium matrix. While the UTS of 375 MPa and 175 MPa of T6-ATS/Al composite at room temperature and at 350 ℃ were obtained, much higher than those of the matrix alloy, the elongation of the ATS/Al composite was nearly equal to the value of matrix alloy. A combined strengthen and toughness mechanism was delieved in the paper by the authors.更多还原