Papers by Keyword: Macro-Segregation

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Authors: Jun Xu, Zhi Hua Gao, Zhi Feng Zhang, Men Gou Tang, Wei Dong Yu
Abstract: Annular electromagnetic stirring (A-EMS) process is verified an advanced metal melt treatment technology. Application research was performed to investigate the solidification behavior of Al-Zn-Mg-Cu alloy in this study. The results indicated that uniformly fine microstructure, less composition macro-segregation and improved mechanical properties were achieved.
Authors: Lorenz Ratke, Sonja Steinbach, Georg Müller, Marc Hainke, András Roósz, Yves Fautrelle, M.D. Dupouy, Gerhard Zimmermann, A. Weiß, Hermann-Josef Diepers, Jacques Lacaze, R. Valdes, G.U. Grün, H.-P. Nicolai, H. Gerke-Cantow
Abstract: The MICAST research program focuses on a systematic analysis of the effect of convection on the microstructure evolution in cast Al-alloys. The experiments of the MICAST team are carried out under well defined thermally and magnetically controlled, convective boundary conditions and analyzed using advanced diagnostics and theoretical modeling, involving phase field simulation, micro-modeling and global simulation of heat and mass transport. The MICAST team uses binary, ternary and technical alloys of the Al-Si family. This paper gives an overview on recent experimental results and theoretical modelling of the MICAST team.
Authors: Soon Gi Lee, Gautam R. Patel, Arun M. Gokhale
Abstract: The normal and inverse solute macro-segregation are known to occur in Al and other nonferrous alloy castings and have been well studied and documented. However, these phenomena have not been investigated in the high-pressure die-cast Mg-alloys. Consequently, the effects of macro-segregation on the mechanical properties of cast Mg-alloys have not been characterized. The objective of this contribution is to investigate the effects of inverse macro-segregation and porosity on the fatigue behavior of high-pressure die-cast AM60 alloy. It is observed that the inverse macro-segregation of eutectic phase at the cast surfaces adversely affects the fatigue behavior: the fatigue resistance decreases substantially due to the presence of the surface segregation.
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