Question 1:
2.1 The bright field images below were taken of a network of dislocations viewed in the /bar (1)(0)/(b)ar (1) direction
from a deformed fcc material, using 3 different Bragg Reflections : (a) /bar (1)/(b)ar (1)1 (b) (0)/(b)ar (2)0 and (c) (1)/(b)ar (1)/(b)ar (1)
From the contrast of the 3 parallel dislocations labeled with red arrows in the three images, identify
their common burger's vector, which is of type a/2 <011: - note there are two possible answers, just
choose one that works. (Do not be concerned about the sign of b ).
2.2 Assuming that the arrowed dislocations run in the direction [0 /bar (1)1 identify their character (edge,
screw or mixed) using the burger's vector you chose in 2.1.
2.3 Identify another Bragg reflection that could distinguish the two possible answers for 2.1.
Question 1: 2.1 The bright field images below were taken of a network of dislocations viewed in the 1 o 1 direction from a deformed fcc material,using3 different Bragg Reflections :(a)111(b)o20 andc111
(a)
500nm
500nm
500nm
From the contrast of the 3 parallel dislocations labeled with red arrows in the three images, identify their common burger's vector, which is of type a/2 <011> - note there are two possible answers, just choose one that works. (Do not be concerned about the sign of b)
2.2 Assuming that the arrowed dislocations run in the direction [011] identify their character (edge, screw or mixed using the burger's vector you chose in 2.1.
2.3 Identify another Bragg reflection that could distinguish the two possible answers for 2.1