Silver
Inert gas (Argon)
Sulphur / Sulfur
E_min (green point)
Red
Ceramic
(1/2,1/2,-1/2)
Taking reciprocals … (222̅)
Plane B:
(-1/2,inf,1/2) … (2̅02)
HINT: Place your origin where the
plane intercepts all axes
Stronger: 1018-cold rolled (pink)
Softer: 1018-Annealed (blue)
More Brittle: 1018-cold rolled (pink)
High Carbon Comp: Both/Neither
(Same Amount = Same Grade)
U_r = (1/2)(YP)(strain)
= (0.5)(77 kpsi)(0.008) = 308.0 psi
{Not covered this year}
(D^2 – D0^2)/(Do^2)
24.1%
Str = s0 + k/D^2
148 MPa
413.9 MPa
8
Why? Wth grain size being above
the nano limit, the highest density of
grain boundaries dictates strength
[120]  (1/2,-1,0)
B
(double check these …)
D  (1,-1/2,=1/2) … [211̅]
C  (-1,1,1) … [1̅11]
11-12% (meets both conditions)
Note the sum is always even …
therefore BCC.
Exam Structure:


Multiple Choice (2-3 pts each)