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Baotou, China

Yang Z.,Central South University | Dong J.,Central South University | Dong J.,Baotou Aluminum Co. | Zhou L.,Central South University | And 3 more authors.
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | Year: 2011

This work evaluated the method of manufacturing bimaterial composite parts by semisolid metal processing (SSP) through strain-induced melt-activated thixo-forging. Sn-15 pct Pb and Pb-30 pct Sn semisolid alloys were chosen as model alloys. Bimetal composite parts were manufactured successfully by forging the semisolid alloys into the same die simultaneously. Optical photography, scanning electron microscopy, energy dispersive X-ray spectroscopy, and Vickers hardness were employed to characterize the samples. The results showed that the composite semisolid fluid flowed in a laminar way. Globular primary grains in the two semisolid alloys maintained their respective geometry and constitutions. The mixture of two liquid phases was limited in a thin layer beneath the interface between the two semisolid alloys. The absence of an oxide-enriched layer at the interface suggests that the oxide skins of the feedstock were torn during the processing, leading to the formation of metallurgical bonding at the composite interface. This work showed that SSP is a promising technology for bimaterial/multimaterial composite manufacturing. The bimaterial composite parts achieved by SSP have a good composite interface and well-located material distribution. © 2010 The Minerals, Metals & Materials Society and ASM International.

Wang Q.-L.,CAS Shenyang Institute of Metal Research | Zhao H.-S.,Baotou Aluminum Co. | Li Z.-G.,Baotou Aluminum Co. | Shen L.,Baotou Aluminum Co. | Zhao J.-Z.,CAS Shenyang Institute of Metal Research
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2013

Two mixing techniques, the immersion method and the vortex method, were adopted in the production of Al-3%B master alloys since the generally used production route involving the direct addition of KBF4 salt to molten aluminum has several drawbacks. The experimental results demonstrate that the Al-B master alloys produced by the immersion method show a microstructure characterized by the appearances of AlB12 phase and many agglomerations of boride particles, while the Al-B master alloy produced by the vortex method exhibits a well dispersed microstructure of AlB2 particles in the matrix. The distinct microstructure features result from the differences in the stirring speed during the salt additions and the average size of the salt droplets achieved by the salt additions. © 2013 The Nonferrous Metals Society of China.

Wang Q.,CAS Shenyang Institute of Metal Research | Zhao H.,Baotou Aluminum Co. | Shen L.,Baotou Aluminum Co. | Li Z.,Baotou Aluminum Co. | Zhao J.,CAS Shenyang Institute of Metal Research
Jinshu Xuebao/Acta Metallurgica Sinica | Year: 2012

Al-B alloys are widely used in industries. Their manufacturing has attracted great attentions. Generally, the Al-B master alloys are manufactured by reacting KBF 4 with molten aluminum. A lot of work has been done to investigate the effects of reaction technologies on the manufacturing of Al-B alloys. But little attentions were paid to the reaction mechanisms at the interface between the aluminum melt and the fluoride salt. The interfacial reactions between Al and KBF 4 play a critical role in the production of Al-B master alloys. Investigations on the interfacial reactions in four different KF-AlF 3 solvents were carried out. It was demonstrated that a boride layer formed at the interface for all the four solvents. There existed AlF 3 between the boride layer and the aluminum melt when the eutectic KF-AlF 3 solvent or the hypereutectic solvents were used. AlF 3 formed by the reaction between BF 3 and Al. © Copyright.

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