Question

find composition of all phases present for 75%wt Ag and 25%wt Cu at 700 C

°C 110) Atomic percent silver 30 10 SO 10 20 60 70 F 80 90 T 1084.5 1200 10X0X0 1 961.93 1700 900 1. + 1600 1+B SOX a B 780 1400 7.9 71.9 91.21 7080 1200 60X) + B 1000 SCO 850 - 1 1 400 Cu 1 20 1 90 10 30 70 SO Ag 10 SO 60 Weight percent silver Above is a phase diagram of Cu - Ag. (a) For 75%wt Ag 25%wt Cu at 700°C what is the composition of all the phases present (2 marks) I (b) Using the Lever rule, determine the weight fractions of each phase for 75%wt Ag 25%wt Cu at 700°C (3 marks) Display O iyo B IG 15 4- * ( A % & $ 8. 3 6 9 4 7 5

can you answer parts a b and c please. need it asap in 40 mins

Answer 1

ogs-5 L Ltd 7,9 91.2 نم B 7000 2080 ma mo % Ag from Hume Rothary Rule for alloy formation 71.9 & atß 5% 75% 95% for 75 wt% Ag composition of phases a and present is ; fhom the abovee horizontal Cire® 700°ç a = 5% B 95% b) from lever dute; moss fractions of ß phases. 22.22% 95 ma Doors and MB e) of two metals ) a) and d 0.22 22 - 75 95-5 0.7777 = 77.77% 75-5 1- ma atomic radius must be less conditions: difference than 15% i) crystal structure of metals must be same. 11) Electronegativity metals must be difference between small.

same Alloy 1 (crystal structure Atomic Radius 0.144 nm Electroneg. ativity Silver → FCC 1.9 FCC 0, 125nm 1.8 Nickel → V cas 0.144 -0.123 = 0.019 = 1.9%815% small 1.9-1.8 =0,1 Alloy 2 1.6 0-132 nm Chromiunm B CC 1.7 0.137 nm Tungstenes BCC q small 0.137-0. 132 -0.005 1.7 -116 same crystal Structure 0.5% <15% F01