復(fù)合材料的界面結(jié)構(gòu)
(江蘇大學(xué) 材料科學(xué)與工程學(xué)院， 鎮(zhèn)江 212013)
摘 要: 借助于透射電鏡（TEM）研究了Al-K2ZrF6體系熔體反應(yīng)生成Al3Zrp/Al復(fù)合材料中Al3Zr顆粒晶體形貌及Al3Zr/Al界面結(jié)構(gòu)。 結(jié)果表明： 原位生成的Al3Zr顆粒以多面體和長(zhǎng)方體為主，顆粒晶體表面存在生長(zhǎng)小面（facet）， 其晶體為四方結(jié)構(gòu)， 密排面為（11¯4¯）；Al3Zr/Al界面光滑、潔凈， 無界面反應(yīng)物。電子衍射圖及界面原子排列分析表明， Al3Zr顆粒與Al在界面處存在位向關(guān)系：［2¯2¯1］Al3Zr∥［100］Al, (012)Al3Zr∥（11¯0）Al，其點(diǎn)陣錯(cuò)配度僅為10.87%。 此外， 熔體反應(yīng)法制備的Al3Zrp/Al復(fù)合材料不僅凝固組織均勻，而且具有良好的力學(xué)性能。
關(guān)鍵字: 界面結(jié)構(gòu); 熔體反應(yīng); 鋁基復(fù)合材料; Al3Zr
CHENG Xiao-nong
（School of Materials Science and Engineering, Jiangsu University,
Zhenjiang 212013, China）
Abstract:The interfacial structure of Al3Zr/Al and crystal morphology of Al3Zr particulates in Al3Zrp/Al composite formed by Al-K2ZrF6 reaction in the melt were studied by transmission electron microscopy (TEM). The results indicate that the crystal morphology of in-situ formed Al3Zr particulate is mainly polyhedron or rectangle. There are the facets on the surface of Al3Zr particles. The close packed plane of Al3Zr crystal with a tetragonal structure is （11¯4¯）.The interface between Al3Zr 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 Al3Zr/Al interface, there is a crystallographic orientation relationship of ［2¯2¯1］Al3Zr∥［100］Al and (012)Al3Zr∥（11¯0）Al.Therefore, it may be concluded that aluminum can nucleate on Al3Zr particles with a small lattice mismatch 10.87%. Moreover, Al3Zrp/Al composites fabricated by direct melt reaction have not only well-distributed solidification microstructure but also excellent mechanical properties.
Key words: interfacial structure; reaction in melt; aluminum matrix composite; Al3Zr
