how to determine the phase from Al-Fe-Si phase diagram (as attach) when the composition containing with 22%Fe and 11%Si. Thanks
Hi Fizam....., I think in terner system (in your case : Al-Fe-Si alloys), the diagram shown is actually a part of the hole diagram : in general, triangle Al - Fe - Si). However, you already have mentioned the compositionof the alloy (Fe 22%, Si 11% and Al 67%), and there are several phases of P1, P2, and P3 existed in the diagram (i.e Al5FeSi, Al8Fe2Si, etc). it means by identifying the position of pure metal in your terner diagram ( in the triangle diagram, follow the pattern of each metal's line and the cross of three line is your composition) and the composition of the alloys will be plotted to your diagram due to determine the phase of Al-Fe-Si based on that % composition. If you want to calculate the compound based on that %composition. You can also do it (by changing % mass to mol ..etc. Hope this will be useful.
Dear Mohd Fizam Zainon,
Very small picture, it is difficult to determine monovariant lines in the Al corner. Your alloy after solidification will contain Al3Fe primary crystals, then smaller Al3Fe+Al8 and small areas of eutectic E1. Send me this phase diagram and I'll try to describe your alloy more precise. My E-mail: [email protected]
I have tried to extend Rudy's answer by completing the triangle of ternary Al-Fe-Si system. It is attached. My crude diagram shows that the composition of this compound is at X as marked. (67%Al-22%Fe-11%Si). I feel that at this composition, 2 phases shown at the bottom of your diagram (Al5-Al5FeSi and Al8-Fe2Si) are in equilibrium. The relative amounts can be determined using the well known lever rule.
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