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| Effect of Transverse Convection Induced by Density Differences on Bidirectional Solidification of Metal-Gas Eutectic |
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| 清华大学机械工程系 |
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Cite this article:
. Effect of Transverse Convection Induced by Density Differences on Bidirectional Solidification of Metal-Gas Eutectic. Acta Metall Sin, 2008, 44(9): 1057-1062 .
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Abstract By use of the bidirectional solidification process of metal-gas eutectic, at an atmosphere of high-pressure hydrogen or gas mixture of hydrogen and argon, a special type of porous material—porous metal with radial pore distribution, can be fabricated. During the solidification of metal-gas eutectic, the volume of the solidifying metal expands due to the evolution of gas pores. This volume expansion leads to a severe transverse convection in front of the solidification interface in the bidirectional solidification process. Experimental results show that during the solidification, the transverse convection in front of the solidifying interface will affect the growth direction of the gas pores, promote gas bubble escaping, and degrade the uniformity of gas pore distribution. By properly designing the structure of the casting mould and choosing appropriate processing parameters, the severe harmful transverse convection in front of the solidification interface can be depressed or limited to a lower level, and high quality radial-type porous magnesium with uniform pore distribution can be obtained.
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Received: 03 March 2008
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