亚微米颗粒对铝基复合材料基体显微结构的影响  

Effects of Sub-Micron Particles on the Matrix Microstructure of Al Based Composites

作　　者：姜龙涛[1] 武高辉[1] 河野纪雄[2] 齐藤秀雄[2] 

机构地区：[1]哈尔滨工业大学,黑龙江哈尔滨150001 [2]日本千叶工业大学金属工学科

出　　处：《稀有金属材料与工程》2007年第6期1002-1004,共3页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50071019);哈尔滨工业大学基金(HIT2002.34)资助

摘　　要：选用0.15μm和5μm的Al2O3颗粒,采用挤压铸造法制备了体积分数为40%的铝基复合材料。利用选区电子衍射和高分辨电子显微技术研究了Al2O3P/1070Al界面附近基体的显微组织。结果表明,复合材料增强体颗粒为5μm时,基体存在大量的由热错配应力引发的位错,颗粒粒径为0.15μm时,基体表现为近无位错的组织特征,其缺陷形式为1～5nm的“微畸变区”,这主要是由于粒径小、分布弥散,微区应力均匀所致。Aluminum based composites in a volume fractions of 40% were fabricated using the Al2O3 particles of 0.15μm and 5μm in sizes by extrusion casting technique. The microstructure characterization near the interfaces of Al2O3p/1070Al composites was investigated by SADP and HREM techniques. Results show that dislocations of high-density were generated in the Al2O3p/Al composite reinforced with Al2O3 particles of 5μm due to the thermal mismatch stress. In contrast, free dislocations and some “micro distortion areas”of 1-5 nm were observed in the Al2O3p/Al composite reinforced with A1203 particles of 0.15 ~tm due to the dispersion of fine sub-micron particles and the uniform stress distribution near the interfaces.

关 键 词：金属基复合材料 AL2O3P/AL 亚微米级Al2O3 显微组织 

分 类 号：TB33[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—物理冶金]