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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.44  No.4 (2003)  >  pp.558-561

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Semi-Solid Processing of Magnesium Alloys

Chang Dong Yim1) and Kwang Seon Shin1)2)
1) School of Materials Science and Engineering, Seoul National University
2) Center for Advanced Aerospace Materials, POSTECH

Semi-solid processing is an emerging technology for near net-shape production of engineering components. Although there has been significant progress in semi-solid processing of Al alloys, very limited information is available on semi-solid processing of Mg alloys, except for the thixomolding process. In semi-solid casting process, it is necessary to properly control the flow and solidification behavior of semi-solid slurries for high quality products. There are a number of parameters that affect the flow and solidification behavior of semi-solid slurries such as viscosity, casting pressure, shapes of gate and mold cavity, gate velocity, mold temperature, etc. In the present study, the effects of various thermo-mechanical treatments were investigated on the change in viscosity of the semi-solid AZ91D magnesium alloys by using a concentric cylinder type viscometer. The effects of gate velocity and thickness on mold filling behavior of the semi-solid AZ91D alloys were also investigated by using a high-speed camera and the results were compared with those obtained from computer simulations. From these results and microstructure examination, a processing map for high pressure die casting of the semi-solid AZ91D alloy was constructed in order to produce sound castings.

semi-solid processing, magnesium alloy, rheological behavior, filling behavior, processing map

Received: November 05, 2002
Accepted: December 06, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals



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