00:02
All right, guys, in this question, we are given a copper zinc alloy of composition, 75 % weight of zinc and 25 % weight of copper.
00:13
That is slowly heated from room temperature.
00:18
So in part a, in order to find the temperature where the first liquid phase form, we have to look the copper zinc phase diagram.
00:29
Copper zinc phase diagram zinc phase diagram that is the figure 9 .19 of the book so you draw the line at 75 % all up to where it intersects with the curve where the first liquid phase form then you read the corresponding temperature and that is approximately equal to 6 .4 40 degree centigrade.
01:17
Now, from the same figure, if you read the composition of the liquid phase, you will get, this is the part b, you will get 85 weight percentage of zinc dash 15 weight percentage.
01:42
Now, in part c of this question, to read at what temperature does complete melting of the alloy occur, we have to draw the line 75 % all up to where it intersects with the liquid curve.
02:00
So the temperature we will get there is 750 degrees centigrade...