【摘要】 采用差分扫描热分析(DSC)方法,测定了TiB2/Al 12%Si的复合过程,并以热分析数据为依据,制备了TiB2/Al 12%Si复合材料,通过X射线衍射(XRD)分析了复合材料的增强相,考察了微观组织和力学性能的关系。结果表明:采用直接反应合成法制备该复合材料的最佳温度在830～860℃;半固态搅拌技术可使增强相在基体中的分布更加均匀;颗粒增强复合材料的力学性能有较大改善,抗拉强度由166MPa提高到184MPa,在热处理后达到336MPa,弹性模量由36 5GPa提高到43.9GPa,但伸长率从12%下降到了2.3%;利用DSC来制订颗粒增强铝基复合材料制备工艺是合理可行的。更多还原

【Abstract】 The synthesis process of TiB₂/Al-12%Si was determined by DSC （differential scanning calorimeter）. The TiB₂/Al-12%Si composite was fabricated on the basis of thermal analysis data. The reinforcement of the composite was analyzed and the relation between mechanical properties and microstructure was examined by XRD. The results show that the optimum reaction temperatures of fabricating the TiB₂/Al-12%Si by DRS（direct reaction synthesis） are between 830℃ and 860 ℃; The distribution of reinforcement in the matrix is more uniform by use of the semisolid stirring processing; In comparison with the matrix the mechanical properties of TiB₂/Al-12%Si are improved dramatically, the ultimate tensile strength of the composite increases from 166MPa to 184MPa, the strength of the composite gets to 336MPa after heat treatment, Youngs modulus increases from 365GPa to 43.9GPa, however elongation decreases from 12% to 2.3%; It is reasonable and feasible to optimize processing parameters for in-situ particle reinforced aluminum matrix composite by DSC.更多还原