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【资源】Development of the as-cast microstructure in magnesium–aluminium alloys
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Development of the as-cast microstructure in magnesium–aluminium alloys This paper presents an overview of several projects undertaken at CAST to increase our understanding of the solidi®cation characteristics of Mg±Al alloys. With the increased use of magnesium alloys, and with casting dominating as a production route, there is a need for a more comprehensive understanding of the mechanisms of solidi®cation and defect formation to allow further optimisation of alloys and casting processes. The paper starts with considering the formation of the primary magnesium dendrites and the means for grain re®nement of magnesium±aluminium alloys. The Mg±Al system is then shown to display a range of eutectic morphologies for increasing aluminium content, ranging from a divorced structure, through several intermediate structures, to a fully lamellar structure at the eutectic composition. The eutectic also in¯uences discontinuous precipitation which occurs in the aluminium-rich regions of the magnesium phase. The paper concludes with a section on porosity formation as a function of alu- minium content and an outline of the mechanism responsible for the formation of banded defects in magnesium alloys, particularly in products made in pressure assisted casting processes. Ó 2001 Elsevier Science Ltd. All rights reserved. 下载地址： http://d.namipan.com/d/4afc97847 ... 871384dadb5b5442200 http://d.namipan.com/d/4afc97847 ... 871384dadb5b5442200 下载测试正常。 http://d.namipan.com/d/4afc978473cb0c5252750942d6b65871384dadb5b5442200 |
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