MSE 280 Engineering Materials
Homework is due on June 14, 2017 by 10:20 AM. Write your name in the
answer sheet. Otherwise, your answers will not be graded. Only 50%
credit will be given for late submission.
1. Materials are us
KULLIYY AH OF ENGINEERING
SEMESTER 2, 2014/2015 SESSION
Level of Study
: UG 2
: 9.00 am -12.00 pm
: 3 Hrs
: MTH 2311/2132
MSE 280 Exam 3 review sheet
1. You are designing an Al-Cu alloy that is to be precipitation hardened. Using the
following phase diagram, what is the maximum copper concentration that you can use in
a) Approximately 0.5 wt% Cu
b) Approximately 6
Phase same structure, composition and
Unlimited solubility can mix any amount of
either constituent and only one phase is
produced. Occurs when
Atomic radius within 15%
Same crystal structures, valance and similar
Eects of Kine-cs
If cool rapidly can leave
equilibrium behind (to
of elements within a grain
Diusion in liquid fairly
Diusion in solid slow!
Steel is an alloy of iron and carbon containing less than
2.11% carbon with smaller amounts of other elements
such as Mn, Si, P, S, Cr, Mo, Ni
Steels are used in many areas
Reinforcement for concrete in construction and roads
Another factor that determines how a material behaves is
its atomic arrangements.
No order- gases
Short range order-nearest neighbor ordering only (amorphous
Long range order ordered arrangement throughout the crystal
AND ANNEALING METALS
RELATIONSHIP OF COLD WORKING TO
THE STRESS STRAIN CURVE
Cold working-apply a stress that exceeds the
original yield stress of the metallic material
Also called work hardening and strain hardening
BINDING ENERGY AND INTERATOMIC
Solids and liquids are relatively incompressible. This tells us
that if we try to push the atoms closer together, some
repulsing force comes into play.
At the same time, there is also an
MSE 280 Engineering Materials
How to think about materials science and
Mechanical, Chemical, Civil, Electrical, etc.
Conserva4on of Mass
Conserva4on of Momentum
Conserva4on of En
Chapter 3 homework questions
What kind of order does each of the following have?
Inert monotomic gases
normal state: SRO only; when heat or electric field is applied: crystallizes
Does LRO ha
Chapter 4 homework questions
Are there any pure materials?
No. The closest you can have is 99.9999% pure.
Are there any pure crystals?
What type of defect is 0-dimensional?
What type of defect is 1-dimensional?
What type of def
Chapter 5 homework questions
Movement of matter caused by atomic thermal motion
Which states of matter does diffusion occur in?
Diffusion in pure materials
Diffusion in impure materials
impurity diffusion; int
Chapter 2 homework questions
Same element, different number of neutrons
Gained or lost electron
controls material's structure and properties
Every electron has a unique _&_
electrons can only have certain specif
Chapter 9 Homework questions
Change from a liquid to a solid as temperature cools
What are the two steps of solidification?
Small piece of solid forms from the liquid; formation of the first nano-sized
crystals from the me
Chapter 9 class notes
liquid metal poured into a mold and is allowed to solidify
defects that occur during casting
a region of small, randomly oriented grains that forms at the surface of a casting as
a result of heterog
TEST 1 STUDY GUIDE
a=b=c all angles=90
a=b does not equal c all angles equal 90
a=b does not equal c alpha beta=90 gamma=120
a does not equal b does not equal c all angles are 90
FINAL EXAM Fill-in-blank STUDY GUIDE
Stress Intensity Parameter
The parameter that characterizes the stress and strain at a given location
ahead of a crack is referred to as the _.
_ is stress computed on the load divided by the instantaneous
Chapter 11 Detailed notes
response of poorly conducting materials to an electric field.
In the presence of an external field the dipoles align with the field. Center of
positive charge different from center of negative c
CHAPTER 10 Quiz
The extrinsic semiconductor in which holes are the dominate charge
carriers are referred to as N-TYPE/P-TYPE semiconductors.
For a semiconductor, increasing the temperature
DECREASES/INCREASES the mobility of the holes and electrons
Miller Indices: Directions
For (a)-(c), write in the Miller indices above each unit cell,
For (d)-(f), draw in the following
\.\ ~ OJ
III (e) [2101 (f) 
-._. _ .- ~
[0 \ \.l
Use the tennis balls at the front of the room for this activity.
You discovered on the previous page that FCC is a close-packed structure. The only
other close-packed structure is called the hexagonal close-packed (HCP). While all
The Charpy test is an impact test designated to measure the impact energy of
different materials. The Charpy test is often used because it is very easy and cheap to
conduct. Different material shave different impact energy based on DBTT, composit
Practice Problems: Miller Indices
Label the following planes.
~0 \ 0 ) - ~\aQ
Xl \ "\ \)
l\ \ \')
Label the following directions.
of a Gear
A gear made of 1025 steel is to be carburized at 950C. If the concentration of
carbon at the surface is suddenly brought to and maintained at 1.20 wt%, how long
will it take to achieve a carbon content ofO.SO wt% at a position 0.5