Application of synchrotron radiation X-ray computed tomography to investigate the agglomerating behavior of TiB2 particles in aluminum

被引：40

作者：

Chen, Fei ^{[1
]}

Mao, Feng ^{[1
]}

Chen, Zongning ^{[1
]}

Han, Jingyu ^{[1
]}

Yan, Guangyuan ^{[1
]}

Wang, Tongmin ^{[1
]}

Cao, Zhiqiang ^{[2
]}

机构：

[1] Dalian Univ Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Mat Modificat Laser Ion & Electron Beams, Dalian 116024, Peoples R China

[2] Dalian Univ Technol, Lab Special Proc Raw Mat, Dalian 116024, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 622卷

基金：

中国国家自然科学基金;

关键词：

Metal matrix composites (MMCs); Synchrotron radiation; Microstructure; Clusters; IN-SITU PREPARATION; WEAR BEHAVIOR; COMPOSITES; ALLOY; MICROSTRUCTURE; PARTICULATE; PRECIPITATION; FRICTION; PHASES; TIAL3;

D O I：

10.1016/j.jallcom.2014.10.190

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Agglomeration of reinforcing particles has a number of deleterious effects on the properties of in situ metal matrix composites (MMCs). In order to better understand this phenomenon, the agglomerating behavior of TiB2 particles in aluminum based in situ MMCs was investigated using synchrotron radiation X-ray computed tomography (SR-CT) and field emission scanning electron microscope (FESEM). SR-CT was shown to be a powerful tool for visualizing and quantifying the three-dimensional (3D) features within the composites. Based on the SR-CT and FESEM results, a formation mechanism of the flaky agglomerates, flocculent agglomerates and clusters of coarse TiB2 particles, which are most frequently presented in the in situ Al/TiB2 composite, has been proposed. The mechanism shows that the formation of these three kinds of agglomerates can be attributed to three parallel processes, i.e. diffusing titanium atoms reacting with AlB2, aluminum melt directly reacting with emulsified salt, diffusing boron atoms reacting with TiAl3, respectively. Moreover, the mechanism may shed some light on how to design better processing techniques for obtaining homogenous particle distribution in in situ Al/TiB2 composites in the future. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：831 / 836

页数：6

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