原位合成铝基复合材料凝固组织中TiB₂粒子的特征

来源期刊：中国有色金属学报1999年第4期

论文作者：杨平

文章页码：752 - 758

关键词：原位合成；TiB₂粒子强化；铝基复合材料

Key words：in situ processing; TiB₂ particle reinforcement; aluminum matrix composites

摘    要：分析了原位合成制备的TiB₂粒子强化铝基复合材料不同凝固组织中TiB₂粒子的分布规律和形貌特征。研究结果表明，TiB₂在该复合材料中细化晶粒的作用较弱，但有明显的聚集倾向，其聚集程度与熔炼方式和加热温度有关；经半固液成型处理的组织中TiB₂的分布特征未改善；六边形和长条形TiB₂可以是同一形态的粒子在空间不同方位的表现，六边形TiB₂的侧面为{1(-2)10}面；测定了TiB₂粒子的尺寸分布 。

Abstract: Analysis was performed on the cast microstructures of in-situ processed aluminum matrix composites reinforced by TiB₂ particles with the emphases on their distribution and morphology. TiB₂ particles have no remarkable grain-refining effect, but a strong tendency of agglomeration, which depended on melting methods as well as heating temperatures. No improvement of particle distribution was observed in the thixoformed structure. It is shown that rectangular and hexagonal morphologies of TiB₂ can stem from a same plate-like particle in different spatial positions. It was observed that the lateral planes of a plate-like TiB₂ particle can be {1(-2)10}. The size distribution of TiB₂ was measured with imaging analyzer.