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Wang Y.-B.,Nanchang University | Yi G.-B.,Jiangxi Xiongying Aluminum Co. | Yang X.-J.,Nanchang University

The effect of different amounts of Na2B4O7 addition, the reaction temperature and holding time on iron removal influence for recycled aluminum alloy were studied by inductively coupled plasma atomic emission spectroscopy, optical microscopy and other means, the effect of different temperatures and Na2B4O7 addition on porosity rate was obtained by using Archimedes principle. The results show that iron removal rate can reach the maximum 7.57% at 720 ℃, 0.5%Na2B4O7 and hold time for 30 min. The internal pores of the sample is increased and density is reduced with the increasing of Na2B4O7 addition at 680 ℃ and 760 ℃, the sample density is increased even up to 2.69 g/cm3 at 720 ℃, adding 0.5%Na2B4O7, beyond without adding up to 3.46%. Suitable iron removal process is obtained, Na2B4O7 addition is 0.5%, the alloy was treated at 720 ℃ and holding time for 30 min. Source

Yang X.-J.,Nanchang University | Wang M.,Nanchang University | Ding L.-S.,Jiangxi Xiongying Aluminum Co. | Guo H.-M.,Nanchang University | Liu X.-B.,Nanchang University
Advances in Mechanical Engineering

The rheo-squeeze casting (rheo-SQC) combining the rheocasting and the SQC was developed, in which semisolid slurry was produced by the low superheat pouring with a shearing field (LSPSF) process. The three-dimensional morphology of the primary α-Al phase and the rest spacing of slurry prepared by LSPSF process have been reconstructed and visualized, and the microstructures of squeeze cast A356 alloy have been obtained. Based on the three-dimensional microstructure reconstructed, their three-dimensional characterizations such as solid volume fraction and equivalent diameter of the extracted primary α-Al phase of the slurry were measured and calculated. And the microstructures of cross-section of squeeze cast product were investigated. Compared and analyzed the typical microstructure characteristics of parts in different positions produced by SQC and rheo-SQC, the results show that the primary α-Al phase was in the form of enriched dendrites across the whole section of parts produced by SQC. Nevertheless, in the relative case of the rheo-SQC, the whole formations of dendrites have been inhibited effectively, revealing a conspicuous modification in morphology and refinement of the primary α-Al phase. In addition, the solid fraction decreased from the centre to the verge of products along the slurry flow orientation. © 2014 Xiang-Jie Yang et al. Source

Yi G.,Nanchang University | Yi G.,Key Laboratory of Near Net Forming in Jiangxi Province | Yang X.,Nanchang University | Yang X.,Key Laboratory of Near Net Forming in Jiangxi Province | And 4 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys

The bending of ultra-thin electrolytic copper foil may be observed due to the instability, of production process, which seriously affects the subsequent processing and product quality. Copper samples with 18 mm in thickness and different warping degree from the five companies were analyzed for internal stress, texture, grain size, to explore the mechanism of bending. Experimental results show that the additives SP, HEC and PEG can cause copper foil bending, which is attributed to the residual stress related with texture, twin boundaries, grain size and internal pores. The additives can result in bending by changing the textures and grain sizes of copper. The degree of bending can be enhanced with the increase of (220) texture and the decrease of grain size. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved. Source

Wang Y.-B.,Nanchang University | Wang L.-J.,Jiangxi Xiongying Aluminum Co. | Yang X.-J.,Nanchang University | Guo H.-M.,Nanchang University | And 2 more authors.

The effect of low superheat pouring with a shear field (LSPSF) process treatment on the morphological change of iron intermetallic phases in the hypereutectic Al-17Si-2Fe alloy and hypoeutectic Al-7Si-2Fe alloy were systematically studied. The results show that, both common casting treatment and LSPSF treatment the rich iron phases are mainly composed of acicular β-Al5FeSi phase in Al-7Si-2Fe alloy. In the Al-17Si-2Fe alloy, the rich iron phases mainly contain acicular β-Al5FeSi phase and δ-Al4FeSi2 phase. After LSPSF process treatment, the rich iron phases are refined and exist δ-Al4FeSi2 phase and a small amount of α-Ali2Fe3Si2 phase. The mechanism of LSPSF treatment on the morphology of rich iron phase was also discussed. ©, 2015, Chinese Mechanical Engineering Society. All right reserved. Source

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