Key Laboratory of Near Net Forming in Jiangxi Province

Nanchang, China

Key Laboratory of Near Net Forming in Jiangxi Province

Nanchang, China
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Liu X.,Nan Chang University | Liu X.,Key Laboratory of Near Net Forming in Jiangxi Province | Huang C.,Nan Chang University | Huang C.,Guang Dong Dong Guan Quality Supervision Testing Center | And 5 more authors.
International Journal of Materials Research | Year: 2015

In this study, the friction and wear properties of A356 alloy processed via semi-solid casting and conventional casting were experimentally investigated. Experimental results indicate that under the same experimental conditions the wear of the semi-solid cast A356 in mass does not exceed 85 % of that of the conventionally cast A356 alloy. The friction coefficient curve of semi-solid cast A356 is smoother than that of the conventionally cast A356. The friction coefficient of the semi-solid cast A356 is around 0.53 for stationary friction, less than the 0.59 for the conventionally cast A356. The improvement in the friction and wear properties is mainly a result of the microstructural change induced by semi-solid processing. © Carl Hanser Verlag GmbH & Co. KG.


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 | Year: 2015

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.


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 3 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015

Aiming at non-steady production process for ultra-thin electrolytic copper foil, effects of current density on microstructure and properties of copper foil were investigated. The grain size and roughness of copper foil matt surface are increased with increasing in current intensity. The increase of current density is beneficial for the growth of (111) and (220) crystal face, however, the growth rate of (220) crystal face is faster than the (111), finally, the (220) crystal face is dominant in growth with increasing in current density continuously. Tensile strength and elongation are related with size effect, and (111) texture can improve tensile strength of the copper foil, while (220) texture can decrease the tensile strength of copper foil and improve the elongation. When the current intensity is increased to a certain extent, the copper foil can be burned and powdered, leading to the deterioration of the tensile strength and elongation. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved.

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