(1.北京工业大学 新型功能材料教育部重点实验室，
北京 100022;
2. 中国科学院 金属研究所固体原子像开放研究实验室，
沈阳 110015)
摘 要: 利用透射电子显微术研究了浸渍-挤压(SiCw+B4Cp)/Mg(AZ91)复合材料的微观组织结构。结果表明，B4Cp/Mg界面处生成了很多MgO和MgB2反应产物，而SiC/Mg界面处反应产物较少。基体中形成了大颗粒体心立方结构的Mg17(Al，Zn)12相和未知的弥散小颗粒物相。大量观察及综合分析表明，SiC和Mg之间不存在固定晶体学位向关系，只可能出现一些择优取向关系，出现几率较大的取向关系为：｛111｝SiC∥｛0001｝Mg， 〈-101〉SiC∥〈11-20〉Mg和｛ 111｝SiC∥｛10-10｝Mg，〈1-10〉SiC ∥〈1-210〉Mg。
关键字: 镁合金基复合材料；SiC晶须；B4C颗粒；微观结构
magnesium alloy composite
（1.The Key Laboratory of Advanced Function Materials for
Ministry of Education，Beijing Polytechnic University，
Beijing 100022, China;
2.Laboratory of Atomic Imaging of Solids，
Institute of Metal Research，The Chinese Academy of Sciences，
Shenyang 110015, China）
Abstract:The microstructure of (SiCw+B4Cp)/AZ91 magnesium alloy composite was studied by TEM. The results show that there are a lot of chemical react ion products MgO and MgB2 phases distributed at B4Cp/Mg interface and a few at SiC/Mg interface. Coarse Mg17(Al，Zn)12 phases and a fine unknown particle s are formed in the matrix. Measurements of crystallographic orientation re lationship between SiC and Mg were made at many SiC/Mg interfaces，showing that no fixed and unique orientation relationships was determined，though the following two orientation were preferential: ｛111｝SiC∥｛0001｝Mg， 〈 -101〉SiC∥〈11-20〉Mg and ｛111 ｝SiC∥｛10-10｝Mg，〈1-10〉SiC∥〈1-210〉Mg.
Key words: magnesium alloy composite；SiC whisker； B4C particle；microstructure
