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Investigation on inductive heating of A356 alloy for thixo-forming

International Journal of Minerals,Metallurgy and Materials 2009年第3期16卷 309-313页

作者： Kai-kun Wang Jian-lin Sun Yong-lin Kang Qi Zhang Lei Yang Chun-mei Ma School of Materials Science and Engineering University of Science and Technology Beijing 100083 Beijing China East-China Micro-electronic Institute of Technology 230022 Hefei China

To meet the demands of continuous stream-line for component production in the thixo-forming industry, billet heating should be of high quality and in a controllable way. A 4-step inductive heating strategy for aluminum alloy A356 was performed. thixotropic testing and microstructure analysis showed that a homogenous temperature distribution was achieved after temperature-power-time optimization. Theoretical analysis was given concerning the thermal conductivity and heat capacity of A356 between conventional and semisolid casting microstructures. The experimental results show that the optimized 4-step strategy could be the best strategy for billet heating during the thixo-forming of aluminum alloy A356.

关键词： thixo-forming aluminum alloys inductive heating temperature distribution

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Numerical simulation on thixoforging of electronic packaging shell with SiC_p/A356 composites

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Transactions of Nonferrous Metals Society of China 2010年第9期20卷 1707-1711页

作者：王开坤汪富玉陈学军王璐马春梅 School of Materials Science and Engineering University of Science and Technology Beijing East China Research Institute of Electronic Engineering

Based on the research of modem electronic packaging materials, thixo-forming technology was used to fabricate electronic packaging shell. The process of thixo-extrusion with SiCp/A356 composites was simulated by the finite element software DEFORM-3D, then the flow velocity field, equivalent strain field and temperature field were analyzed. The electronic packaging shell was manufactured by extrusion according to the results from numerical simulation. The results show that thixo-forming technology can be used in producing electronic package shell with SiCp/A356 composites, and high volume fraction of SiCp with homogeneous distribution can be achieved, being in agreement with the requirements of electronic packaging materials.

关键词： thixo-forming SiCp/A356 composites electronic packaging shell numerical simulation

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Effect of Slope Plate Variable and Reheating on the Semi-Solid Structure of Ductile Cast Iron

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Tsinghua Science and Technology 2008年第2期13卷 147-151页

作者： M. Nili-Ahmadabadi F. Pahlevani P. Babaghorbani School of Metallurgy and Materials Engineering University of Tehran

Semi-solid metal casting and forming is a promising production method for a wide range of metal alloys, In spite of many applications for semi-solid processed light alloys, few works have reported on the semi-solid processing of iron and steel. In this research, an inclined plate was used to change the dendritic structure of iron to globular. The effects of the length and slope of the plate on the casting structure were examined. The results show that the process effectively changes the dendritic structure to globular. A sloped plate angle of 7.5° and length of 560 mm with a cooling rate of 67 K· s^-1 gave the optimum graphite nodu- larity and solid particle globularity. The results also show that the sloped plate more easily prevents inoculant fading since the total time processing is rather short. In addition the semi-solid ductile cast iron prepared using the inclined plate method was reheated to examine the effect of reheating conditions on the microstructure and coarsening kinetics of the alloy. The solid fractions at different reheating temperatures and holding times were used to find the optimum reheating temperature range.

关键词： ductile cast iron semi-solid reheating thixo-forming

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