Effect of Sr addition on porosity formation in directionally solidified A356 alloy
作者： H C Liao , W Song , Q G Wang , L Zhao , R Fan
DOI: 10.1179/1743133613Y.0000000053
关键词: Porosity 、 Metallurgy 、 Composite material 、 Materials science 、 Alloy 、 Number density 、 Volume fraction 、 Directional solidification 、 Oxide 、 Nucleation 、 Growth rate
摘要: AbstractPorosity formation in a Sr modified A356 alloy was investigated using microfocus X-ray imaging and directional solidification technology. In situ experimental results indicate that addition enhances the effectiveness of oxide inclusions liquid aluminium as pore nucleation sites thus leads to remarkable rise temperature. As pores are nucleated high temperature region far away from front, they can grow at growth rate for relatively long time, thus, significant increases volume fraction porosity particularly number density large seen alloy. The decreases with reduction local temperature, it fluctuates violently during solidification. Addition weakens this fluctuation average pores. has considerable influence on size distribution
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