Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 25, Issue 1, Pages 54-60Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(15)63578-6
Keywords
discontinuously reinforced aluminum matrix composites; TiB2; wedge-shaped copper mold casting; particle distribution; particle engulfment
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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 alpha-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.
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