【摘要】 提出一种用于描述颗粒增强铝基复合材料屈服强度的综合强化模型。基于复合材料显微组织及压缩力学性能检测,对铝基复合材料的强化机制进行研究。为了精确地描述增强相分布均匀性和不同位错强化机制间的协同关系对强化效果的影响,在综合强化模型中引入颗粒分布均匀性因子u和协同系数f_c。结果表明,本研究提出的综合强化模型预测结果与实验结果吻合很好,可以精确地描述Al₃Ti/2024 Al复合材料的屈服强度,理论与实验误差小于1.2%,其预测精度远高于现有综合强化模型的预测精度。该模型也可适用于预测具有不同比例增强相的Al₃Ti/2024 Al复合材料的屈服强度。更多还原

【Abstract】 A modified mixed strengthening model was proposed for describing the yield strength of particle reinforced aluminum matrix composites. The strengthening mechanisms of the composites were analyzed based on the microstructures and compression mechanical properties. The distribution uniformity of reinforcements and cooperation relationship among dislocation mechanisms were considered in the modified mixed strengthening model by introducing a distribution uniformity factor u and a cooperation coefficient f_c, respectively. The results show that the modified mixed strengthening model can accurately describe the yield strengths of Al₃Ti/2024 Al composites with a relative deviation less than 1.2%, which is much more accurate than other strengthening models. The modified mixed model can also be used to predict the yield strength of Al₃Ti/2024 Al composites with different fractions of reinforcements.更多还原