摘要
借助于透射电镜 (TEM )研究了Al K2 ZrF6体系熔体反应生成Al3 Zrp/Al复合材料中Al3 Zr颗粒晶体形貌及Al3 Zr/Al界面结构。结果表明 :原位生成的Al3 Zr颗粒以多面体和长方体为主 ,颗粒晶体表面存在生长小面(facet) ,其晶体为四方结构 ,密排面为 (11- 4- ) ;Al3 Zr/Al界面光滑、洁净 ,无界面反应物。电子衍射图及界面原子排列分析表明 ,Al3 Zr颗粒与Al在界面处存在位向关系 :[2 - 2 - 1]Al3 Zr∥ [10 0 ]Al,(0 12 ) Al3 Zr∥ (11- 0 ) Al,其点阵错配度仅为 10 .87%。此外 ,熔体反应法制备的Al3 Zrp/Al复合材料不仅凝固组织均匀 ,而且具有良好的力学性能。
The interfacial structure of Al 3Zr/Al and crystal morphology of Al 3Zr particulates in Al 3Zr p/Al composite formed by Al-K 2ZrF 6 reaction in the melt were studied by transmission electron microscopy (TEM). The results indicate that the crystal morphology of in-situ formed Al 3Zr particulate is mainly polyhedron or rectangle. There are the facets on the surface of Al 3Zr particles. The close packed plane of Al 3Zr crystal with a tetragonal structure is (1 1- 4-).The interface between Al 3Zr particulate and aluminum matrix, where there is no reaction product, is smooth and clean. According to the analysis of electron diffraction pattern and the atomic arrangement at the Al 3Zr/Al interface, there is a crystallographic orientation relationship of [2[DD(-*2/5]- 2- 1] Al 3Zr ∥ Al 3Zr ∥ Al and (0 1 2) Al 3Zr ∥(1 1- 0) Al . Therefore, it may be concluded that aluminum can nucleate on Al 3Zr particles with a small lattice mismatch 10.87%. Moreover, Al 3Zr p/Al composites fabricated by direct melt reaction have not only well-distributed solidification microstructure but also excellent mechanical properties.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2002年第6期1184-1188,共5页
The Chinese Journal of Nonferrous Metals
基金
国家教育部重点资助项目 ( 2 0 0 0 15 6 )
国家机械局资助项目 ( 992B0 0 0 7)
关键词
界面结构
熔体反应
铝基复合材料
AL3ZR
interfacial structure
reaction in melt
aluminum matrix composite
Al 3Zr
