【摘要】 以Ti粉和Al-40V合金粉末为原料,添加微量稀土化合物YB4,采用常压烧结工艺,利用YB4的高温热分解反应原位自生（Y₂O₃+TiB）/Ti-6Al-4V复合材料,研究YB4添加量对材料组织与力学性能的影响。利用X射线衍射仪（XRD）、扫描电镜（SEM）、电子探针显微分析（EPMA）等手段分析复合材料的显微组织、物相组成和增强体的微观形貌,用电子拉伸机测试材料的力学性能。结果表明,YB4在Ti-6Al-4V合金中发生原位反应,生成Y₂O₃颗粒和TiB晶须。随YB4添加量增加,Y₂O₃颗粒逐渐聚集成团,TiB晶须长大。添加微量YB4可略微提高合金的抗拉强度,并显著提高伸长率。YB4添加量（质量分数）为0.263%时,原位自生（（Y₂O₃+TiB）/Ti-6Al-4V）复合材料获得高抗拉强度和高伸长率,分别为924.80 MPa和9.13%。更多还原

【Abstract】 The rare earth compound YB4 was added into Ti-6 Al-4 V alloy fabricated using Ti and Al-40 V alloy powders as raw materials to prepare in-situ（Y₂O₃+TiB）/Ti-6 Al-4 V composites by the high temperature thermal decomposition reaction of YB4 with titanium matrix. The effects of the amount of YB4 addition on the microstructure and mechanical properties of the composite were studied. The microstructures and phase compositions of the composites were analyzed by X-ray diffractometer（XRD）, SEM and EPMA. The mechanical properties of materials were tested by electronic stretcher. The results show that the YB4 reacts with titanium matrix and in-situ generate Y₂O₃ particles and TiB whiskers. With increasing YB4 additive amount, Y₂O₃ particles gradually agglomerate and TiB whiskers grow. The minor content of YB4 in（Y₂O₃+TiB）/Ti-6 Al-4 V composites can slightly increase the tensile strength and significantly improve the elongation. In-situ synthesized（TiB+Y₂O₃）/Ti-6 Al-4 V composites achieved both high tensile strength（924.0 MPa） and high tensile ductility（9.13%） with adding mass fraction of 0.263% YB4 powder.更多还原