Given the following phase diagram answer question 15 Melting

Given the following phase diagram answer question 1-5? Melting point of Al-10% Si is About 850 degree C 577 degree C 585 degree C 120 degree C Maximum solubility of Al in Si in solid solution is 1.65%Al 99.83% Al None of the above Si content of alpha-phase at 500 degree C in an alloy of Al -10% Si is 90% 10% 1.5% None of the above Eutectoid reaction in Al-Si system takes place at? 1.65% Si 12.6%Si 99.83% Si None of the above Aluminum content in the liquid phase at 1000 degree C in Al-10%Si is 99.83% l.65% 12.6% 10%

Solution

11. As we know for 12.6%Si, Melting pt. of Al is 577⁰C from the graph. But if we draw a vertical line at 10% Al and then horizontal to the point of intersection of curve and the horizantal line it is slightly above the 577^oC. So the melting pt. of Al is 585^oC. Answer is C. 585^oC.

12. From the graph, it is clearly seen that maximum solubility of Al in Si is 99.83 % Al. Therefore answer is B. 99.83% Al

13. Answer is C. 1.5%

14. Answer is B. 12.6% Si.

15. Answer is D. 10%