University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
ENGR 2220
Structure & Properties of Materials
Lecture 18
Compositescontd.
Chapter 16
Classification Scheme for
Composite Materials
1. Metal Matrix Composites (MMCs)  mixtures of
ceramics and metals, such as cemented carbides
and other cermets
2 Ceramic
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
3.5 Show that the atomic packing factor for BCC is 0.68.
Solution
The atomic packing factor is defined as the ratio of sphere volume (VS ) to the total unit cell volume (VC ),
or
APF =
VS
VC
Because there are two spheres associated with each unit cell for
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
ENGR 2220U Structure and Properties of Materials
Answer all questions
Time Allowed: 70 minutes
Term Exam 1
Section 1(40733)
Q1 (10 marks)
Briefly define
a) Yield strength?
Stress level required to produce a very slight (a strain offset of 0.002 is usually
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
ENGR 2220U Structure and Properties of
Materials: Section 2
MidTerm Examination 1
Time: 70 minutes
Date: October 11, 2006
Instructions:
Answer all questions
This exam contains 4 sections.
The questions do not carry equal marks. Spend your time accordingl
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
Solution 1:
Plane A
Intercepts
Intercepts (in terms of a, b, c)
Reciprocals
Enclosure
Plane B
Intercepts
Intercepts (in terms of a, b, c)
Reciprocals
Enclosure
x
a/2
1/2
2
y
b
1
1
( 21 1 )
z
c
1
1
x
y
b/2
1/2
2
(02 1 )
z
c
1
1
a
Solution 2:
Ca has F
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
MidTerm Examination: ENGR 2220U Structure and Properties of Materials (Duration 70 minutes)
G. Rizvi
Q1 (6 marks)
Determine the Miller indices for the two planes shown in the following unit cell.
Q2 (8 marks)
Derive the relationship between the lattice p
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
Assignment #1
MANE/ENGR 2220
Structure & Properties of Materials
To get part marks, show all your work
1. Calculate the theoretical density of FCC Copper, which has an atomic radius of 0.128 nm and
the atomic weight of 63.55 g/mol.
Solution
This problem c
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
4.4 Calculate the number of vacancies per cubic meter in gold (Au) at 900C. The energy for vacancy formation is
0.98 eV/atom. Furthermore, the density and atomic weight for Au are 18.63 g/cm 3 (at 900C) and 196.9 g/mol,
respectively.
Solution
Determinatio
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
MidTerm Exam: ENGR 2220U: 40733 Section 1; Fall 2008
Time allowed  70 minutes
Q 1 (7 marks)
a) What do we mean by the term crystalline materials?
They are solid materials where atoms, ions or molecules are characterized by a periodic
and repeating three
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
MidTerm Exam: ENGR 2220U: 40733 Section 1; Fall 2008
Time allowed  70 minutes
Q 1 (7 marks)
a) What do we mean by the term crystalline materials?
They are solid materials where atoms, ions or molecules are characterized by a periodic
and repeating three
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
ENGR 2220
Structure & Properties of Materials
Lecture 15
POLYMER STRUCTURES
Chapter 14
Reminder
Quiz  3 October 29  Wednesday
4 pm till 10 am October 30
Coverage:
C
up tto lecture
l t
14
CHAPTER 14:
POLYMER STRUCTURES
ISSUES TO ADDRESS.
ADDRESS
Wha
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
MANE/ENGR 2220: Structure & Properties of Materials
Midterm Fall 2014
Instructors: Dr. Sayyed Ali Hosseini
Dr. Ghaus Rizvi
1. (a) Sketch the unit cell of BCC crystal structure.
(b) Show the steps needed to find the atomic packing factor (APF) of BCC cryst
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
Assignment #3
MANE/ENGR 2220
Structure & Properties of Materials
6.3 A specimen of copper having a rectangular cross section 15.2 mm 19.1 mm (0.60 in. 0.75 in.) is pulled in tension
with 44,500 N (10,000 lbf) force, producing only elastic deformation. Cal
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
ENGR 2220
Structure & Properties of Materials
Lecture1
I t d ti
Introduction
Instructor: Ghaus Rizvi
Instructor:GhausRizvi
ENGR 2220
St
Structure
t
& Properties
P
ti off Materials
M t i l
COURSE MATERIAL
Required text:
Materials Science and Engineering
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
ENGR 2220
Structure & Properties of Materials
Lecture 22
Phase Diagrams
Ph
Di
contd.
td
Phase Transformations in Metals
Chapter 9 & 10
In Class Quiz
Review for final exam
December 2
Formula Sheet Survey Result
Formulae sheet for final exam
Allowed one p
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
Mid Term Exam
Mid Term Exam is scheduled on Tuesday October 21, 2008, during the lecture hours
I had discussed the coverage and format of the exam during the last lecture, but am posting it
again.
The coverage:
The midterm exam on October 21 will be from
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
ENGR 2220
Structure & Properties of Materials
Lecture 9
Diffusion in Solids Contd.
Chapter 5
Diffusion Mechanisms
Vacancy Diffusion:
atoms exchange with vacancies
applies to substitutional impurities atoms
rate depends on:
number
number of vacancies
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
ENGR 2220
Structure & Properties of Materials
Lecture 16
Polymer
P
l
Structures,
St
t
Ch
Characteristics,
t i ti
Applications & Processing
Chapter 14 & 15
Chapter 14 
POLYMER MICROSTRUCTURE
Polymer = many mers
mer
H H H H H H
C C C C C C
H H H H H H
Po
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
ENGR 2220
Structure & Properties of Materials
Lecture 20
Phase Diagrams
Chapter 9
Phase Diagram Single Component: H2O
Phase Equilibria: Solubility Limit
Introduction
Solutions solid solutions, single phase
Mixtures
Mi t
more than
th one phase
h
Adapte
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
ENGR 2220
Structure & Properties of Materials
Lecture 17
Composites
Chapter 16
CHAPTER 16:
COMPOSITE MATERIALS
ISSUES TO ADDRESS.
ADDRESS
What are the classes and types of composites?
Why are composites used instead of metals,
ceramics, or polymers?
H
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
ENGR 2220
Structure & Properties of Materials
Lecture 8
Diffusion in Solids
Chapter 5
Chapter 5: Diffusion in Solids
ISSUES TO ADDRESS.
How does diffusion occur?
Why is it an important part of processing?
How can the rate of diffusion be predicted for
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
Assignment #2
ENGR 2220
Structure & Properties of Materials
To get part marks, show all your work
1. Determine the number of vacancies needed for a FCC lead (Pb) crystal to have a density
of 11.35 g/cm3.
Solution: Since the lead is FCC, four atoms are pre
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
ENGR 2220U Structure and Properties of
Materials: Section 1
MidTerm Examination
Instructor: Ghaus Rizvi
Time: 70 minutes
Date: October 27, 2009
Instructions:
Last page is the Formula sheet
Answer all questions
The questions do not carry equal marks. Spen
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
ENGR 2220
Structure & Properties of Materials
Lecture 13
Structures & Properties of Ceramics
Chapter 12
Chapter 12: Structures &
Properties of Ceramics
ISSUES TO ADDRESS.
ADDRESS
Structures of ceramic materials:
How do they differ from those of metals?
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
ENGR 2220
Structure & Properties of Materials
Lecture 19
Compositescontd.
Chapter 16
Metal Matrix Composites (MMCs)
Cermets
MMC with ceramic contained in a metallic matrix
The ceramic often dominates the mixture,
sometimes up to 96% by volume
Bonding c
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
ENGR 2220
Structure & Properties of Materials
Lecture 7
Imperfections in Solids
Chapter 4
CHAPTER 4:
IMPERFECTIONS IN SOLIDS
Imperfections
p
in Solids
Solidification result of casting of molten material
2 steps
Nuclei form
Nuclei
uc e g
grow
o to
o
University of Ontario Institute of Technology (UOIT)
Structures and Properties of Materials
ENGINEERIN ENGR2220

Fall 2013
PRACTICE PROBLEM ANSWERS
Chapter  3
3.5 Show that the atomic packing factor for BCC is 0.68.
Ans: APF =
VS
8p R3 /3
=
= 0.68
VC 64 R3 /3 3
3.8 Strontium (Sr) has an FCC crystal structure, an atomic radius of 0.215 nm and an atomic
weight of 87.62 g/mol.