May 8, 2021 Saturday – 14:50
MetE 308Section 1-2/Midterm1/Page 1 of 2
MetE 308 Physical Foundations of Materials
MIDTERM-1
PART 2
SURNAME, Name: .................................................... ID number: .................................... Duration: 35 min
Q1. In the below given 2-dimensional microstructural section of a material there are following number of
second phase particles with dihedral angle, , 120. These second phases are located at the following
locations:
i) 1 second phase particle at the Grain Face
ii) 2 second phase particles at the Grain Edge
iii) 3 second phase particles at the Grain Corner
a) Draw these 6 second phase particles schematically on this microstructure by exactly labeling them
with their respective locations.
b) For every location; briefly explain why and how you can see the second phase particles in this 2-D
section of a 3-D structure as you have drawn.
MetE 308Section 1-2/Midterm1/Page 2 of 2
May 8, 2021 Saturday – 14:50
SURNAME, Name: .................................................... ID number: .................................... Duration: 35 min
Q2. a) Draw the Free Energy (Gs) vs. %Cu diagram for a 4 %Cu alloy being aged at 300 C after it has been
solutionized at 525 C and quenched.
b) Write dawn the precipitation sequence upon aging at 300 C, and briefly explain the reason of this
sequence by mentioning about the absence and presence of any phases in this sequence with why
they are absent or present.