Formation mechanism of intragranular structure in nano-composites^①

来源期刊：中国有色金属学报(英文版)2004年第2期

论文作者：王昕 单妍 龚红宇 于薛刚 徐静 尹衍升

文章页码：265 - 269

Key words：intragranular structure; grain growth; nanocomposites; formation mechanism

Abstract: The effect of sintering process and ZrO₂contents on formation of intragranular ZrO₂in Al₂O₃matrix was investigated withα-Al₂O₃micro-powders and ZrO₂nano-powders as original materials. It is found that the second-phase particles coalesce with the growth of matrix grains during sintering. The process conditions that benefit the growth of matrix grains benefit the formation of intragrains. The formation procedure of intragrains could be described as follows. At first, the particles are driven to agglomerate during densification of the matrix . Some particles move along with the migration of the matrix grain boundaries and tend to further gather, then become intergrains. Those gripped between the matrix grain boundaries become intragrains during the growth of matrix grains.