Effects of electric pulse modification on liquid structure of Al–5%Cu alloy

The electric pulse modification (EP, EPM) of liquid metal is a novel method for grain refinement. The structure of EP-modified Al-5%Cu melt was characterized by high-temperature X-ray diffractometry. The results show that the Cu-containing Al clusters remarkably increase in the EP-modified melt, fur...

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Published in:Transactions of Nonferrous Metals Society of China 2013-09, Vol.23 (9), p.2792-2796
Main Authors: WANG, Jian-zhong, QI, Jin-gang, ZHAO, Zuo-fu, GUO, Hong-sheng, ZHAO, Tao
Format: Article
Language:English
Subjects:
Aluminum
Aluminum base alloys
Al–Cu melt
atomic cluster
Atomic structure
CALORIMETRY
Clusters
Copper
Differential scanning calorimetry
electric pulse modification
liquid structure
Liquids
Melts
MOLECULAR STRUCTURE
SOLIDIFICATION
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Summary:The electric pulse modification (EP, EPM) of liquid metal is a novel method for grain refinement. The structure of EP-modified Al-5%Cu melt was characterized by high-temperature X-ray diffractometry. The results show that the Cu-containing Al clusters remarkably increase in the EP-modified melt, furthermore, these clusters in that case tend to contract due to the decrease of relevant atomic radius and the co-ordination number. This kind of liquid-phase structure leads to a more homogeneous Cu-rich phase distribution in the final solidification structure. Differential scanning calorimetry (DSC) tests indicate that the solidification super-cooling degree of the EP-modified liquid phase is 2.36 times that of the unmodified. These facts suggest that the atom cluster changes in EP-modified Al-5%Cu melt would disagree with that by EPM model previously proposed in liquid pure metal.
ISSN:1003-6326
DOI:10.1016/S1003-6326(13)62799-5