申坤,汪明朴,郭明星

• 1:中南大学材料科学与工程学院
• 2:洛桑联邦理工学院力学冶金实验室

摘要(Abstract)：

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。

关键词(KeyWords)： 机械合金化;原位反应;Cu-TiB2合金;模型

Abstract:

Keywords:

基金项目(Foundation): 国家高新技术发展“863”计划资助项目(2002AA302505);; 国家高新技术发展“863”计划资助项目(2006AA03Z517)

作者(Author): 申坤,汪明朴,郭明星

DOI: 10.13289/j.issn.1009-6264.2010.05.020

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