(北京科技大學(xué)材料科學(xué)與工程學(xué)院，北京100083)
摘 要: 分析了原位合成制備的TiB2粒子強(qiáng)化鋁基復(fù)合材料不同凝固組織中TiB2粒子的分布規(guī)律和形貌特征。研究結(jié)果表明，TiB2在該復(fù)合材料中細(xì)化晶粒的作用較弱，但有明顯的聚集傾向，其聚集程度與熔煉方式和加熱溫度有關(guān)；經(jīng)半固液成型處理的組織中TiB2的分布特征未改善；六邊形和長(zhǎng)條形TiB2可以是同一形態(tài)的粒子在空間不同方位的表現(xiàn)，六邊形TiB2的側(cè)面為{1(-2)10}面；測(cè)定了TiB2粒子的尺寸分布 。
關(guān)鍵字: 原位合成；TiB2粒子強(qiáng)化；鋁基復(fù)合材料
（Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, P.R.China）
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.
Key words: in situ processing; TiB2 particle reinforcement; aluminum matrix composites
