Effect Of Mg Addition On The Foaming Behaviour Of Alsi7 Based Alloy Prepared By Powder Metallurgy Method
RARE METAL MATERIALS AND ENGINEERING(2016)
摘要
The effects of high Mg addition (2 wt%, 4 wt% and 6 wt%) on the foaming behavior of AlSi7 based alloys were researched. The results show that Mg can react with Al2O3 phase and Si element, and then the produced MgAl2O4 phase which has a good wettability with Al melt and Mg2Si phase are formed. Both of them can uniformly distribute in the alloy and induce a particle based stabilization mechanism, which can significantly reduce the negative impact of gravity drainage and capillarity. High Mg content can also change the pores formation in early stage, as a result, the pores grow and nucleate in a pool of liquid in a fairly spherical way. Therefore, a high expansion rate and good pore structures can be obtained. The disadvantage of high Mg content is the decrease of surface tension which makes pores easy to bust. A good trade-off between the beneficial and adverse effects of Mg content is 4 wt% for AlSi7 based alloy.
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关键词
aluminum foam,Mg addition,stability of foaming,pore structure,TiH2
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