ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 25    No. 1    January 2015

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Distribution and engulfment behavior of TiB2 particles or clusters in wedge-shaped copper casting ingot
Jing SUN, Xiao-bo ZHANG, Qing CAI, Yi-jie ZHANG, Nai-heng MA, Hao-wei WANG
(State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China)
Abstract: Wedge-shaped copper casting experiment was conducted to study the engulfment behavior of TiB2 particle and the interaction between particle or cluster and the solid/liquid front in commercial pure aluminum matrix. The experimental results show that the particle size distribution obeys two separate systems in the whole wedge-cast sample. Furthermore, it is found that the big clusters are pushed to the center of the wedge shaped sample and the single particle or small clusters consisting of few particles are engulfed into the α-Al in the area of the sample edge. The cluster degree of particles varies in different areas, and its value is 0.2 and 0.6 for the cluster fraction in the edge and in the center of the wedge sample, respectively. The cluster diameter does not obey the normal distribution but approximately obeys lognormal distribution in the present work. More importantly, in the whole sample, the particle size obeys two separate log-normal distributions.
Key words: discontinuously reinforced aluminum matrix composites; TiB2; wedge-shaped copper mold casting; particle distribution; particle engulfment
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
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