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| The Critical Processing Conditions for Directional Solidification of Solid/Gas Eutectics |
| Hua-Wei ZHANG;; |
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Cite this article:
Hua-Wei ZHANG. The Critical Processing Conditions for Directional Solidification of Solid/Gas Eutectics. Acta Metall Sin, 2007, 43(6): 589-594 .
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Abstract Among all the processing parameters which affect porous structure obtained by directional solidification of a solid/gas (e.g. metal/hydrogen) eutectic (Gasar), the gas pressure above melts and the superheating temperature of melts are the most observable and easily governed because they directly control the amount of hydrogen saturated in melts. The critical processing conditions for hydrogen to escape and for formation of lotus-type porous structure have been deduced through theoretical analysis and calculation, and the following conclusions have been obtained: both the superheating temperature and the argon partial pressure should have moderate values, viz. with given partial pressures of hydrogen and argon, the superheating temperature should be bigger than the threshold of formation of lotus-type structure and smaller than that of hydrogen to escape; however, with given superheat degree and hydrogen partial pressure, the argon partial pressure should be bigger than the threshold of hydrogen to escape and smaller than that of formation of lotus-type porous structure. These conclusions were verified by the experimental results of lotus-type porous Mg and will contribute to the fabrication of high-quality regular porous metals by Gasar process.
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Received: 01 September 2006
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