利用高能球磨以及高温热处理研究了原位合成高浓度Cu-2.5 wt%TiB2合金过程,并对其不同状态的组织、性能以及原位反应模型进行了研究.结果表明,随着球磨时间的延长,复合合金粉末显微硬度分三个阶段变化,即快速上升阶段,缓慢上升阶段和平稳波动阶段;组织经历相互焊合、形成交替分布的层状组织以及层状组织消失后的均匀分布组织;SEM和x射线衍射分析均表明长时间高能球磨不能在复合粉末基体内形成TiB2粒子;高能球磨60 h后的复合粉末其第二个DSC放热峰向低温区发生了明显的推移,初步判定激发其发生原位反应的最低温度为660℃.SEM观察发现复合粉末经后续900℃高温热处理后能够合成了大量细小的TiB2粒子,并绘制了原位合成TiB2粒子形成模型图.
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