Baotou Aluminum Co.

Baotou, China

Baotou Aluminum Co.

Baotou, China
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Wang Q.-L.,Yanshan University | Shen L.,Baotou Aluminum Co. | Zhao J.-Z.,CAS Shenyang Institute of Metal Research | Zhang X.-Z.,Yanshan University
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2016

AlB12-type Al-B master alloys (AlB12-type master alloys) were prepared by high temperature treatment of AlB2-type Al-B master alloy melts (AlB2-type master alloy melts) with different boride distributions. The results show that, when the AlB2-type master alloy melt, in which the boride particles are severely segregated and some sizable boride agglomerations exist, is slowly agitated during the high temperature treatment. AlB12 particles are severely segregated in the produced AlB12-type master alloy. During the high temperature treatment, the coalescence phenomenon happens for the AlB2 particles in close contact with each other in boride agglomerations, resulting in the formation of large AlB12 particles. The high-speed stirring adopted during the high temperature treatment can effectively prohibit the formation of AlB12 agglomerations, and also has an effect of preventing the coalescence of AlB2 particles in boride agglomerations, thereby effectively reduce the size and size distribution range of AlB12 particles in the produced AlB12-type master alloys. © 2016, Science Press. All right reserved.

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.

Shen L.,Baotou Aluminum Ltd Company | Shen L.,Inner Mongolia University of Technology | Guo Y.J.,Baotou Aluminum Ltd Company | Shi Z.M.,Inner Mongolia University of Technology
MATEC Web of Conferences | Year: 2016

The modification effects of Al-RE (rare earth) and Al-5Ti-1B master alloys on the microstructure and mechanical properties of as-cast 5182 aluminum alloys were studied. Experimental results show that both of the modifications refine the α-Al grains and the Mg2Si and (FeMn)Al6 eutectics. The Mg2Al3 phases exist in the forms of thin flake (β′-Mg2Al3) and small granule (β-Mg2Al3) for the unmodified 5182 aluminum alloy. Modifications with 0.1 wt% Al-5Ti-1B and 0.2 wt% Al-RE yield longer flakes of β′-Mg2Al3 and small amounts of β-Mg2Al3 granules. The other contents of the modifiers reduce the longer flakes of β′-Mg2Al3 but facilitate formation of the particles and islands of β-Mg2Al3. The 0.2 wt% of Al-RE modification yields the finest microstructure and the largest ductility; the 0.2 wt% of Al-5Ti-1B modification has better microstructure and the highest tensile strength. © The Authors, published by EDP Sciences, 2016.

Ye Y.,Central South University | Liu E.,Baotou Aluminum Co. | Liu H.,Ningbo Branch of China Academy of Ordnance Science | Yang Z.,Central South University
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2013

ER4043 aluminum alloy welding wires were prepared by the casting-extrusion-drawing process. The ER4043 welding wires prepared were used as filler to weld 5052 aluminum plates by TIG. Micro-structures and mechanical properties of the alloy and welded joint were investigated by OM(optical microscope), EDS (energy dispersive spectrometer), TEM (transmission electron microscope), tension tests and hardness tests at room temperature. The results show that the wires drew with ingots by the homogenized at 475°C for 24h at 450°C exhibit uniform structure and desirable mechanical properties. The interface of the matrix and heat affected zone (HAZ) is the weakest zone. The formation of easy crack zone in the HAZ is attributed to the welding gas hole from the matrix.

Shen L.,Baotou Aluminum Co. | Wang Q.,Chinese Academy of Sciences | Wang Q.,Yanshan University | Jiang H.,Chinese Academy of Sciences | And 3 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2016

Al-5B and Al-7B alloy melts were poured into different moulds (graphite mould, iron mould and sand mould) for solidification to understand influences of cooling rate and stirring on the microstructure evolution of Al-B alloys. The results demonstrate that the average size and width of the size distribution of the boride particles are decreased with the increase of cooling rate. At fixed cooling rate, a boride particle in Al-5B master alloy exhibits serious segregation while it exhibits weak segregation in Al-7B master alloy. Furthermore, effects of stirring on microstructural evolution of Al-B master alloy were described. It also indicates that stirring before casting can prevent effectively the coagulation between the boride particles and inhibit the formation of coarse boride particles, promoting the formation of dispersed microstructure. © 2016, Journal Office of Special Casting and Nonferrous Alloys. All right reserved.

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.

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