Metallurgical Engineering > GATE 2020 > Phase Diagram
The Mg-Sn phase diagram exhibits two eutectics on either side of the high melting intermetallic line compound, Mg2Sn, as given below.
At 561oC: L (36.9 wt.% Sn) → α (14.48 wt.% Sn) + Mg2Sn
At 203oC: L (97.87 wt.% Sn) → β-Sn (almost 100 wt.% Sn) + Mg2Sn
After the eutectic reaction has gone to completion and equilibrium has been attained at a temperature just below 561oC, the amount of eutectic constituent (in wt.%) present in the alloy, Mg-50 wt.% Sn, is approximately _______. Given, atomic weight of Sn is 118.7 and Mg is 24.3.
(A) 25
(B) 38
(C) 62
(D) 75
At 561oC: L (36.9 wt.% Sn) → α (14.48 wt.% Sn) + Mg2Sn
At 203oC: L (97.87 wt.% Sn) → β-Sn (almost 100 wt.% Sn) + Mg2Sn
After the eutectic reaction has gone to completion and equilibrium has been attained at a temperature just below 561oC, the amount of eutectic constituent (in wt.%) present in the alloy, Mg-50 wt.% Sn, is approximately _______. Given, atomic weight of Sn is 118.7 and Mg is 24.3.
(A) 25
(B) 38
(C) 62
(D) 75
Correct : c
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