(1. 北京工業(yè)大學(xué) 新型功能材料教育部重點(diǎn)實(shí)驗(yàn)室，
北京 100022;
2. 中國(guó)科學(xué)院 金屬研究所 固體原子像開(kāi)放研究實(shí)驗(yàn)室，
沈陽(yáng) 110015)
摘 要: 用透射電子顯微術(shù)研究了(SiCw+B4Cp)/Mg(AZ91)復(fù)合材料的界面特征。結(jié)果表明：B4Cp/Mg界面區(qū)反應(yīng)生成物混亂，而在SiCw/Mg界面區(qū)較為規(guī)則。SiCw/Mg界面生成了兩種反應(yīng)物，其中MgO與SiC具有180°旋轉(zhuǎn)孿晶關(guān)系，孿晶面為｛111｝SiC，MgO，而MgB2一般以SiC表面一薄層MgO為基底生長(zhǎng)成較大且完整的晶形， MgB2與MgO之間的晶體學(xué)取向關(guān)系為：(-111)MgO∥(000-1)MgB2，［110］MgO∥［11-20］MgB2。 高分辨觀察結(jié)合計(jì)算機(jī)模擬確定了MgO/MgB2界面有兩種原子占位方式，一種為界面處有兩層Mg原子分別屬于兩相，另一種為界面處只有一層Mg原子為兩相共享。此外，基體中第二相Mg17(Al，Zn)12和未知彌散小顆粒均與基體Mg非共格。
關(guān)鍵字: 鎂基復(fù)合材料；SiC晶須；B4C顆粒；界面結(jié)構(gòu)
Mg(AZ91) magnesium alloy composite
（1.The Key Laboratory of Advanced Function Materials,
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 interfacial structure of (SiCw+B4Cp)/Mg(AZ91) magnesium alloy composite was studied by CTEM and HREM. The results show that there are a lot of chemical reaction products formed at the B4C/Mg interfaces and their distributions are mingle-mangle. Thin interfacial products MgO co-existing with the products MgB2 was found at the SiC/Mg interfaces. The orientation relationships between SiC and MgO is 180° rotation-twinning， while the relationships of (-111)MgO(000-1)MgB2，［110］MgO［11-20］MgB2 exist between MgO and MgB2. Two atomic structure models for the Mgo/MgB2 interface were defined by the HREM image and computer simulation. Besides， the HREM also show the interfaces between the matrix and the coarse second phase Mg17(Al，Zn)12 as well as a fine unknown particle are un-coherent.
Key words: magnesium matrix composite；SiC whisker；B4C particle；interfacial structure
