用于金属基复合材料应用的、分散有TiB2颗粒的铝合金的微观结构分析。

Microstructural analysis of Al alloys dispersed with TiB2 particulate for MMC applications.

作者信息

Wang X, Brydson R, Jha A, Ellis J

机构信息

Department of Materials, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, U.K.

出版信息

J Microsc. 1999 Nov;196(# (Pt 2)):137-45. doi: 10.1046/j.1365-2818.1999.00620.x.

DOI:10.1046/j.1365-2818.1999.00620.x

PMID:10540266

Abstract

A dispersion of TiB2 particulates in an Al alloy matrix was formed via the in-situ reaction between mixtures of K2TiF6 (K2ZrF6), KBF4 and molten aluminium. The dispersion of the ceramic phase in the aluminium matrix was also achieved in some experiments by adding exogenous TiB2 particles to the fluoride melt in contact with molten aluminium. In this work, we have examined the microstructure of the as-cast metal matrix composites using analytical electron microscopy and X-ray diffraction techniques. The phases formed as a result of the reaction between the molten fluoride flux and liquid aluminium have been identified. These were (Ti, Zr, Al)B2, Al3Ti and possibly AlB12 in the Al-matrix, and KAlF4 and KMgF3 in the solidified flux. The mechanism of formation of TiB2 and Al3Ti is explained. The role of alloying elements is also explained in the context of interfacial chemistry and dispersion.

摘要

通过K2TiF6（K2ZrF6）、KBF4与熔融铝的混合物之间的原位反应，在铝合金基体中形成了TiB2颗粒的分散体。在一些实验中，通过向与熔融铝接触的氟化物熔体中添加外源TiB2颗粒，也实现了陶瓷相在铝基体中的分散。在这项工作中，我们使用分析电子显微镜和X射线衍射技术研究了铸态金属基复合材料的微观结构。已经确定了熔融氟化物熔剂与液态铝之间反应形成的相。这些相在铝基体中为（Ti、Zr、Al）B2、Al3Ti以及可能的AlB12，在凝固的熔剂中为KAlF4和KMgF3。解释了TiB2和Al3Ti的形成机制。还在界面化学和分散的背景下解释了合金元素的作用。