Matrial questions please please please help me Thank you in

Matrial questions: please please please help me. Thank you in advance.

Question 12 (1 point) The lead-tin phase diagram is shown below (Fig. 9.8 p.300. For an alloy with a composition of 25 wt% Sn 75 wt% Pb, select the phases present and their compositions at 100 C. Composition At%Sn 20 100 3270 C 500 300 Liquid 232 c a +L 200 83°C 400 61.9 97,8 183 300 E B a 20 100 Pb Composition wt%Sn L 25 wt% Sn 75 wt% L 25 wt% Sn 75 wt% Pb Pb 25 wt% Sn 75 wt% a 5.1 wt% Sn 94.9 a 5.1 wt% Sn 94.9 a 25 wtovo Sn 75 wt% Pb wt% Pb Pb B 25 wt% Sn 75 wt% B 98.7 wtovo Sn 1.3 wt% Pb B 25 wt% Sn 75 wt% Pb B -98.7 wt% Sn 1.3 Wt% Pb Wt% Pb Pb Save Question 13 (1 point The lead-tin phase diagram is shown below. Fig. 9.8, p.300. Using this diagram determine which of the followingphases/phase combinations be present for an alloy of composition 79 wt% Sn 21 wt% Pb that is at equilibrium at 230 C.

Solution

Answer 14 It contains 2 eutectic point

Answer 15 Physical and chemical balanced or homogenous