I found that Mg2si particle (reinforcement) was suddenly burning at Al (matrix) molten surface during mixing in stir casting process. After burning, all Mg2si particles turn into hard lumps like sludge. Therefore, it can't wetting between the particle and Al molten.
Need suggestion how to prevent Mg2si particle burning during mixing?
The reinforcement particle was preheated 200°C for 2 hours and melting temperature of the Al is 900°C. The reinforcement just 5%wt.
Dear Mr. Zainon;
I personally don't work with these material but I find you a paper which could be helpful and inform you about the Stir casting method. Maybe you could find your answer through the text.
please check the link bellow;
Good Luck
http://www.technicaljournalsonline.com/ijaers/VOL%20II/IJAERS%20VOL%20II%20ISSUE%20IV%20JULY%20SEPTEMBER%202013/334.pdf
I'm not sure my answer help you, but one general way to add Mg or other active elements into the melt is using "Master Alloys". Then during the solidification Mg2Si will be nucleated.
If you insist that add particles to the melt I don't know what to do.
Best Wishes
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