原位自生增强相准连续网状分布铝基复合材料的制备及强韧化机理

项目名称： 原位自生增强相准连续网状分布铝基复合材料的制备及强韧化机理

项目编号： No.51201047

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 金属材料学科

项目作者： 王桂松

作者单位： 哈尔滨工业大学

项目金额： 25万元

中文摘要： 针对增强相均匀分布的传统铝基复合材料强度、刚度高，但塑性、韧性低的问题，本项目以"微结构韧化"为指导思想设计了增强相呈三维准连续网状分布新型铝基复合材料。该材料由两部分构成：网状增强相分布区和无增强相分布的基体区。网状增强相分布区作为"骨架"起到有效强化作用，而大比例的基体区则有利于获得良好塑性和韧性。以大尺寸Al粉和细小ZrO2粉为原料，采用低能球磨和真空热压技术，原位反应生成Al3Zr颗粒和纳米Al2O3颗粒，制备增强相准连续网状分布（Al3Zrp+Al2O3np）/Al复合材料。通过研究球磨和真空热压烧结工艺对增强相的形状、尺寸、空间分布、界面结构和基体组织的影响，揭示制备工艺对网状铝基复合材料微观组织与力学性能影响规律。建立网状铝基复合材料微观组织与宏观性能的关系，以实现网状铝基复合材料组织和性能的可控制及可预测。结合理论分析及数值模拟，阐明准连续网状铝基复合材料强化和韧化机理。

中文关键词： 网状结构；铝基复合材料；原位自生；强韧化；力学性能

英文摘要： In general,conventional Al matrix composites with reinforcements homogeneous distribution usually exibit some superior properties, such as high strength and stiffness.However,some disadvantages in terms of poor plasticity and fracture toughness can not be ignored. To solve the above problem , this project designs the novel composites reinforced by in-situ （Al3Zrp+Al2O3np）with three dimensional quasi-continuous network distribution according to microstructurally toughened mechanism. The composites consist of two parts: the Al matrix composites region reinforced by high volume fraction network reinforcements and the matrix region without reinforcements. The regions with network reinforcement distribution play an effective strenghening role as a "skeleton",while the large proportion matrix contributes to good plasticity and fracture toughness.Using Aluminum powder with large size and fine ZrO2 powder as raw materials, the novel in-situ （Al3Zrp+Al2O3np）/Al composites reinforced by reinforcements with three dimensional quasi-continuous network distribution are fabricated by low-energy milling and reactive hot pressing techniques. Ball milling and hot pressing sintering on the shape, size, distributions of reinforcements, interfaces and matrix microstructure are investigated in detaill to reaval the influences on mi

英文关键词： network distribution；Al matrix composites；In-situ；strengthening and roughening；mechanical properties