【摘要】 本工作利用无压渗透法制备刚玉颗粒(α·Al₂O_3p)增强AlMg10合金复合材料,采用扫描电镜和EDS分析显微组织,并对无压渗透过程热力学研究,提出其反应加工机制:刚玉颗粒间隙内有限容积气氛（21%O₂,79%N₂）,同熔融合金中铝（Al）镁（Mg）元素反应,形成固相,造成某种真空度,为无压渗透的驱动力。高温长时间条件下熔融基体AlMg10合金同刚玉颗粒和附加物的残留物发生化学反应。更多还原

【Abstract】 The study on the mechanism of reactive processing for the fabrication of α-Al₂O_3p/Al composite was performed by pressureless metal infiltration technique, optical micrography, SEM-micrography and EDS-analysis and thermodynamic consideration. This suggests the mechanism of reactive processing: the atmosphere of limited volume in vacancies between alundum particles (α-Al₂O_3p) could chemically react with Al-and Mg-element in the molten AlMg10 alloy infiltrated spontaneously into the preform of alundum particles, forming solid phases and a vacuum, i. e., a driving force for the infiltration; due to the long time contact between the molten AlMg10 alloy and alundum particles and additives, etc., at elevated temperatures, there might be chemical reactions.更多还原