摘要
采用纯Ａｌ粉、Ｃ粉和ＳｉＣ颗粒进行机械合金化和热处理，经冷压实后直接进行热挤压，成功地制备了Ａｌ_４Ｃ_３、Ａｌ_２Ｏ_３弥散质点不和ＳｉＣ颗粒复合强化Ａｌ复会材料．金相显微镜、透射电镜和高分辨电镜观察表明，ＳｉＣ颗粒与Ａｌ基体具有较好界面结合，其在基体中分布的均匀性受基体粉末特性的影响Ａｌ_２Ｏ_３含量较低且尺寸细小，Ｘ射线衍射和透镜分析难以确定．Ａｌ_４Ｃ_３为尺寸细小（直径约０．０２μｍ，长度约０．２μｍ）的棒状单晶体，与Ａｌ基体没有固定的取向关系，界面结合良好，无中间过渡层．
The Al_4C_3 and Al_2O_3 dispersoids and SiC particulate strengthened aluminum composites were successfully fabricated by mechanical alloying of Al powder,C powder and SiC particulates, followed by heat treatment, cold compaction and hot extrusion.Metallography, TEM and HREM observations indicate that the interfacial bonding between SiC particulates and Al matrix is fair, and the characteristics of matrix powders affects the unifromity of SiC particulate distribution in matrix. The existence of Al_2O_3 cannot be determined by XRD and TEM due to low content and fine size of Al_2O_3 . Rod-like Al_4C_3 single crystals with a mean diameter of 0.02 μm and a meam length of 0.2 μm are uniformly distributed in matrix, and have no consistent orientation relationship with Al matrix. The interfacial bonding between Al_4C_3 and Al is excellent, no transitional layer exists.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1994年第1期B027-B032,共6页
Acta Metallurgica Sinica
基金
国家863计划
辽宁省博士科研起动基金
关键词
铝基
复合材料
碳化硅
制备
结构
composite
SiC
Al_4C_3
Al_2O_3
Al
mechanical alloying
microstructure
