(1.北京工業(yè)大學 新型功能材料教育部重點實驗室，
北京 100022;
2. 中國科學院 金屬研究所固體原子像開放研究實驗室，
沈陽 110015)
摘 要: 利用透射電子顯微術(shù)研究了浸漬-擠壓(SiCw+B4Cp)/Mg(AZ91)復合材料的微觀組織結(jié)構(gòu)。結(jié)果表明，B4Cp/Mg界面處生成了很多MgO和MgB2反應(yīng)產(chǎn)物，而SiC/Mg界面處反應(yīng)產(chǎn)物較少。基體中形成了大顆粒體心立方結(jié)構(gòu)的Mg17(Al，Zn)12相和未知的彌散小顆粒物相。大量觀察及綜合分析表明，SiC和Mg之間不存在固定晶體學位向關(guān)系，只可能出現(xiàn)一些擇優(yōu)取向關(guān)系，出現(xiàn)幾率較大的取向關(guān)系為：｛111｝SiC∥｛0001｝Mg， 〈-101〉SiC∥〈11-20〉Mg和｛ 111｝SiC∥｛10-10｝Mg，〈1-10〉SiC ∥〈1-210〉Mg。
關(guān)鍵字: 鎂合金基復合材料；SiC晶須；B4C顆粒；微觀結(jié)構(gòu)
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
