Ho_2O_3掺杂对原位合成HoAl-Al_2O_3/TiAl复合材料显微组织及性能的影响  

Effect of Ho_2O_3 Doped on Micro-Structures and Properties of In-Situ HoAl-Al_2O_3/TiAl Composites

作　　者：许红娅[1] 王芬[1] 解宇星 朱建锋[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,西安710021 [2]中国航天科技集团第六研究院,西安710077

出　　处：《航空材料学报》2009年第6期85-88,共4页Journal of Aeronautical Materials

基　　金：国家自然科学基金资助项目(50672056);陕西科技大学研究生创新基金资助

摘　　要：采用固态置换反应原位合成工艺,利用Al-Ti-TiO2-Ho2O3体系的放热反应合成了HoAl-Al2O3/TiAl复合材料。利用XRD和SEM分析了Ho2O3掺杂对原位合成HoAl,Al2O3颗粒强化钛铝基复合材料显微组织的影响,探讨了稀土氧化物(Ho2O3)的细化机制。测试了力学性能。结果表明:Al-Ti-TiO2-Ho2O3系原位合成的HoAl-Al2O3/TiAl复合材料由TiAl,Ti3Al,Al2O3以及HoAl相组成;HoAl金属间化合物弥散分布于基体晶粒和Al2O3颗粒交界处,限制颗粒长大,细化基体晶粒与Al2O3颗粒,同时提高了HoAl,Al2O3颗粒在基体中的分散度;Ho2O3的引入改善了复合材料的力学性能。HoAl-Al2O3/Ti aluminide composites reinforced by Ho2O3 were prepared by in-situ hot-pressing method with the exothermic reaction of Al, Ti, TiO2 and Ho2O3 powder. The effect of Ho2O3doping on the microstruetures was analyzed by XRD, SEM. Bending strength and fracture toughness properties were tested. The refinement mechanism of rare-earth oxide was investigated as well. The resuits show the phases of the composites are composed of TiAl, Ti3 Al, Al2O3 and HoAl. The HoAI particles distributed at grain boundary of the matrix and Al2O3 particles. At the same time, it restricted particle size and increased particle dissemination of the HoAl, Al2O3. The mechanical property of composites reinforced by Ho2O3 were increased.

关 键 词：Ho2O3掺杂 HoAl-Al2O3/TiAl复合材料 微观形貌 力学性能 

分 类 号：TG146.4[一般工业技术—材料科学与工程]