In general, the introduction of a substitutional alloying element into a lattic will?

[Steven]

a) reduce yield strength and reduce ductility
b)increase yield strength and reduce ductility
c) reduce yield strength but increase ductility
d) increase yield strength and increase ductility
e)facilitate dislocation movement

Question 2

A steel bar is cold drawn from 10mm diameter to 8mm diameter. The amount of cold work applied is
a)8%
b)18%
c)36%
d)64%
E)108%

question 3
Following on from the previous question, if the length of the bar before drawing was 1000mm, the new length after drawing is
a)1563mm
b)1801 mm
c)2678mm
d)3010mm
e)4561mm


Urgent help need please. Have exam next week

thanks in advance