原位自生TiB2/Al基复合材料的制备及性能

The Fabrication and Performance of the In-situ TiB_(2)/Al Composites

在合金的基础上进一步引入纳米陶瓷颗粒,从而制备出颗粒增强金属基复合材料,是提高金属材料综合性能的重要手段。本文从原位自生TiB_(2)/Al基复合材料的制备方法、不同加工工艺下复合材料的微观组织、复合材料的力学性能三个方面总结了其研究现状,同时展望了原位自生TiB_(2)/Al基复合材料的发展方向。通过原位自生方法制备出的TiB_(2)颗粒增强铝基复合材料具有颗粒尺寸小、与基体界面结合良好等优点。通过合金化设计、热加工塑性变形、快速凝固工艺可进一步改善纳米陶瓷颗粒的分散性。相对于外加法制备的金属基复合材料,原位自生TiB_(2)/Al基复合材料具有更加优异的力学性能,如弹性模量、强度、抗疲劳性能、抗蠕变性能等。

It is an important method to improve the comprehensive properties of metal matrix composites by introducing nano-ceramic particles into the alloys.In the present work,the research status of in-situ TiB_(2)/Al composites was summarized from three aspects:the preparation methods,the microstructures of the composites under different processing techniques,the mechanical properties of the composites.TiB_(2)particle reinforced aluminum matrix composites prepared by in-situ methods have the advantages of small particle size and good interface bonding with matrix.The dispersion of nano-TiB_(2)particles can be modified through alloying design,hot working and rapid solidification.Compared with metal matrix composites prepared by external method,in-situ TiB_(2)/Al matrix composites have excellent mechanical properties,such as elastic modulus,strength,fatigue resistance,creep resistance and so on.