| (SiCW+B4Cp)/MB15 Mg基复合材料的微观结构 |
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| 引用本文： | 陈玉喜,李斗星,张国定.(SiCW+B4Cp)/MB15 Mg基复合材料的微观结构[J].金属学报,2000,36(11):1229-1232. |
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| 作者姓名： | 陈玉喜 李斗星 张国定 |
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| 作者单位： | 1. 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
2. 上海交通大学金属基复合材料国家重点实验室,上海,200030 |
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| 基金项目： | 国家自然科学基金59831020和59871055资助项目 |
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| 摘 要： | 利用高分辨电镜研究了(SiCw+B4Cp)/MB15 Mg合金基复合材料的微观结构.SiC晶须的表面附着呈截角八面体形状的MgO纳米颗粒.此外,MgB2和MgO共生在SiC晶须的表面,三者之间存在固定的晶体学取向关系110]SiC∥110]MgO∥1120]MgB2和(111SiC∥(111MgO∥(0001MgB2.MgB2相呈六角盘状几何外形,在Mg合金中其界面能的各向异性显著.此外,还发现了SiC和Mg存在的一种晶体学取向关系111]siC∥0001]Mg和(202)siC∥(1120)Mg.研究结果表明,在Mg合金复合材料中,SiC比B4C更加稳定.
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| 关 键 词： | 高分辨电子显微术 镁基复合材料 微观结构 |
| 文章编号： | 0412-1961(2000)11-1229-04 |
| 修稿时间： | 2000年1月21日 |
MICROSTRUCTURE STUDIES OF A (SiCw+B4Cp)/MB15 MAGNESIUM ALLOY MATRIX COMPOSITE |
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| CHEN Yuxi,LI Douxing,ZHANG Guoding.MICROSTRUCTURE STUDIES OF A (SiCw+B4Cp)/MB15 MAGNESIUM ALLOY MATRIX COMPOSITE[J].Acta Metallurgica Sinica,2000,36(11):1229-1232. |
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| Authors: | CHEN Yuxi LI Douxing ZHANG Guoding |
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| Abstract: | The microstructure of a (SiC_W B_4C_p)/MB15 magnesium alloy matrix composite was studied by high--resolution electron microscopy (HREM). MgO nanocrystalline particle with cubooctahedral in shape was found at SiC/Mg interface. Besides, MgO co-existing with MgB_2 was also observed at SiC/Mg interface. There exists a consistent orientation relationship (O.R.) among SiC, MgO and MgB_2, i.e. 110]sic // 110]MgO// 1120]MgB_2 and (111)SiC // (111)MgO // (0001)MgB_2 MgB_2 is hexagonal plate-like in shape. There is a large energy anisotropy of the interfaces between MgB_2 and Mg. An O.R. between SiC and Mg was found, i.e. 111]SiC // 0001]Mg and (202)SiC // (1120)Mg. Experimental results indicate that SiC is more stable than B_4C in the (SiC_W B_4C_p)/ MB15 magnesium alloy matrix composite. |
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| Keywords: | B4C MgB2 |
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