2.8 For the K shell, the four quantum numbers for each of the two electrons in the 1s state, in the order of
nlmlms, are 100 and 100(-). Write the four quantum numbers for all of the electrons in the L and M
shells, and note which correspond to the s, p,
MSE 170 hw solutions Ch 14-15
Ch 14: 11, 13, 22, 23
Ch 15: 5, 7, 14, 22
Chapter 14
14.11 Sketch portions of a linear polystyrene molecule that are (a) syndiotactic, (b)
atactic, and (c) isotactic. Use two-dimensional schematics per footnote 8 of this chap
9.53 Figure 9.37 is a portion of the copperaluminum phase diagram for which only single-phase regions
are labeled. Specify temperaturecomposition points at which all eutectics, eutectoids, peritectics, and
congruent phase transformations occur. Also, for
4.39 For an FCC single crystal, would you expect the surface energy for a (100) plane to be greater or
less than that for a (111) plane? Why? (Note: You may want to consult the solution to Problem 3.60 at
the end of Chapter 3.)
Answer
The surface energy f
8.1 What is the magnitude of the maximum stress that exists at the tip of an internal crack having a radius
of curvature of 1.9 104 mm (7.5 106 in.) and a crack length of 3.8 102 mm (1.5 103 in.) when a
tensile stress of 140 MPa (20,000 psi) is applied?
S
9.7 Given here are the solidus and liquidus temperatures for the coppergold system. Construct the phase
diagram for this system and label each region.
Composition (wt% Au)
Solidus Temperature (C)
Liquidus Temperature (C)
0
1085
1085
20
1019
1042
40
972
99
MSE 170 hw solutions Ch 11-12
Ch11: 3, 13, 30
Ch12: 39, 47
Chapter 11
11.3 What is the function of alloying elements in tool steels? (1 point)
Solution
The alloying elements in tool steels (e.g., Cr, V, W, and Mo) combine with the
carbon to form very hard
MSE 170, Fall 2012
Week 2 homework solutions
Assignment
2: 14, 22
3: 5, 8, 13
12: 5, 7
Solutions
2: 14 2 points
The net potential energy between two adjacent ions, EN, may be represented by the sum of Equations 2.8
and 2.9; that is,
EN =
A
B
+ n
r
r
Calc
MSE 170, Fall 2012
Week 5 homework solutions
Assignment
7: 5, 6, 7, 15, 25, 26, 35
8: 5, 13, 20, 31
Solutions
7: 5 0.5 points
(a) Define a slip system.
(b) Do all metals have the same slip system? Why or why not?
Solution
(a) A slip system is a crystallog
MSE 170, Fall 2012
Week 4 homework solutions
Assignment
5: 1, 3, 7
6: 4, 6, 25, 29
Solutions
5: 1 1 point
Briefly explain the difference between self-diffusion and interdiffusion.
Solution
Self-diffusion is atomic migration in pure metals-i.e., when all a
MSE 170, Fall 2012
Week 3 homework solutions
Assignment
3: 27, 28, 41, 45
4: 1, 4, 12
Solutions
3: 27 1 point
Draw an orthorhombic unit cell, and within that cell a [121 ] direction.
Solution
This problem calls for us to draw a [121 ] direction within an
Mechanical failure
How do flaws in a material initiate failure?
How is fracture resistance quantified; how do different
material classes compare?
How do we estimate the stress to fracture?
How do loading rate, loading history, and temperature
affect t
9.53 Figure 9.37 is a portion of the copperaluminum phase diagram for which only single-phase regions
are labeled. Specify temperaturecomposition points at which all eutectics, eutectoids, peritectics, and
congruent phase transformations occur. Also, for
Problem I (20 points): 2. Pozm (Act.
Mark True (T) or False (F) for the following statements.
I. The electron conﬁguration of M” is l522522p°3d74s'. F
2. The equilibrium bond length between two atoms corresponds to the bond length when the net force
betwe
MSE 170 Midterm Study Sheet
Exam Date: Wednesday, January 28th, 2015
Exam is closed book, closed notes, closed neighbors.
Bring calculator and straight edge ruler.
Sample exams are available on the web page.
Equations needed, except those listed at bott
MSE 170 Midterm Study Sheet
Exam Date: Friday February 14th, 2015
Exam is closed book, closed notes, closed neighbors.
Bring calculator and straight edge ruler.
Sample exams are available on the web page.
Equations needed, except those listed at bottom,
ENGR/MSE 170
Midterm 03/20/08
166pts. total
Exam is closed book, closed notes, closed neighbors
Instruction:
1. Write your name and student ID on top of page.
2. Write legibly.
3. Show work as needed to justify answers
4. Underline all final numerical ans
~
9~.t .1;
J"'J.
f
ENGR/MSE 170B Final exam 12/13/00
(Total: 1OSpts)
Exam is closedbook
(Two sheetsof letter sizepaper allowed)
Instruction:
1. Placeyour nameand studentill on top page
2. Write legibly
3. Showwork asneedto justify answers
4. Circle all fm
ENGR/MSE 170 A Midterm (10/29/2012) Name:
100 points total
Student ID:
Problem 1 (20 points): Bonding and interatomic forces
a. (5 points) Referring to the periodic Table on last page, determine what are the predominant atomic
bondings for NaCl, SiC, H2O?
MSE 170 hw solutions Ch 9-10
Ch9: 3, 8, 14, 32, 33, 49, 50
Ch10: 9, 16, 20
Chapter 9
9.3 Cite three variables that determine the microstructure of an alloy. (0.5 point)
Solution
Three variables that determine the microstructure of an alloy are (1) the all
MSE170hwsolutionsCh16&18
Ch16:1,3,8
Ch18:1,7,21,28,30
Chapter16
16.1 The mechanical properties of aluminum may be improved by incorporating fine
particles of aluminum oxide (Al2O3). Given that the moduli of elasticity of these
materials are, respectively,
Chapter 14 Polymer structures
Hydrocarbon molecules
Polymer molecules
Molecular structures & configurations
Copolymers
Polymer crystallinity
Hydrocarbon molecules
Hydrocarbon: composed of hydrogen and carbon
Single, double, and triple bonds
H
H
H
Binary eutectic systems nanowire growth
Introduce SiCl4
growth
heating
[111]
Si(111)
Growth at 900C with SiCl4 + H2
Silicon nanowires
1
Binary-eutectic systems
T(C)
Ex.: Cu-Ag system
120 0
Cu-Ag
L (liquid)
system
3 single phase regions
1000
(L, )
L + 77
ENGR/MSE 170 Midterm review
Exam date: 10/29/2012 Mon, lecture time
Place: Class room
Close book, notes and neighbors
A sheet of letter-sized paper with double-sided
notes is allowed
Material on the exam will be taken from the
text book, lecture notes, ho
Chapter 8 Failure (Fatigue and creep)
Impact fracture testing
Fatigue
Fatigue life and design
Fatigue mechanisms
Factors that affect fracture life
Generalized creep behavior
Stress and temperature effects
Impact fracture testing
Impact
testing
tech
Chapter 6: Mechanical properties of metals
Outline
Elastic recovery during plastic deformation
Hardness
Variability of material properties
Design/safety factors
Elastic recovery during plastic deformation
Schematic tensile stress-strain diagram show
Chapter 5: Diffusion
Outline
Introduction
Diffusion mechanisms
Steady-state diffusion
Nonsteady-state diffusion
Factors that influence diffusion
Introduction
Diffusion: the
phenomenon
of material
transport by
atomic motion
Interdiffusion:
In an al
HW#3 (Due Friday, Oct 28, 2016 in class)
[1].
Below, atom radium, crystal structure, electronegativity, and the most common
valence are tabulated for various elements.
Elements
Cu
C
H
O
Ag
Al
Co
Cr
Fe
Ni
Pd
Pt
Sn
Zn
Atomic radius (nm)
0.1278
0.071
0.046
0
MSE 170 Fall 2016 HW #2 - Solutions
Question 1. Using Table 12.2, Table 12.3, and Table 12.4, predict the crystal structure for (a)
CsI (b) NiO (c) KI (d)NiS. Justify your selections.
Question 2. Draw the (100), (110) and (111) planes for the rock-salt, c
MSE170 Fall 2016 HW #1
Question 1. Allowed values for the quantum numbers of electrons are as follows:
n = 1, 2, 3, . . .
l = 0, 1, 2, 3, . . . , n 1
ml = 0, 1, 2, 3, . . . , l
ms =
1
2
The relationships between n and the shell designations are noted in
MSE170 Fall 2016 HW #1 - Solutions
Question 1. Allowed values for the quantum numbers of electrons are as follows:
n = 1, 2, 3, . . .
l = 0, 1, 2, 3, . . . , n 1
ml = 0, 1, 2, 3, . . . , l
ms =
1
2
The relationships between n and the shell designations a