Materials Science 201051 2nd Exam
NAME (Print) gen :1 MURAL: ID# mimics
Closed book & notes. Answer all questions. This is a 60 minute exam.
1. Agopper single frystal is in the form of a thin cylinder with [2 0 3] along the tensile axis. The
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i ' MS 201 - 051 lst Mid Term
Answer all questions. CLOSED BOOK AND NOTES. Partial credit will ONLY be given if the work
is clearly presented.
I. Molybdenum has bcc crystal structure. The atomic radius is 0.136n
MS 201 lst Mid Term, SPRING 2009
PRINTED NAME (Last, rst) In; 492A gem ID# Almvis 26 7
Answer all questions. CLOSED BOOK AND NOTES. All wireless devices to betfr/ O
Partial credit will ONLY be given if the work is clearly presented and legibl
Taatalirm has ism mural Simmf Tb may is 16. chma 8m atomic samba! is "13 and the
mimic arms is 181 8 arm: Calculate this mimic radius sf mntuium in mm. cfw_Avagsdm s
unmbamdxi p. 1*
ANSWER sass/m a 8.3: 8? -"-~ (3.35:. m
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MSZOlOOl Quiz 3/12/09
PRINTED NAME (Last, rst) patina Kw , ID# 42026226 7
Closed book and notes. No wireless devices allowed out. SHOW ALL WORK.
1. (4 points) The diffusivity of phosphorus in silicon at 950C is 3.0 x 101,9 1112/ sec,
Approximately how l
MS 2011st Mid Term,
- '. Signature
Answer all questions. CLOSED BOOK AND NOTES. ALL communication capable devices to be turned
off and put away. Partial credit will ONLY be given if the work is clearly presented.
Silver has fcc crystal structure. The dens
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MS201 2nd Exam,
This is a 1 hour exam, closed book and closed notes.
The cross-sectional area of a steel cable is O.0025m 2 and Young's modulus is 207GPa.
How much work is done in stretching a 750.0m length of this cab
Name @119 Ham 511.11 ID No. A .2912 "'53 g f3
l. A dispersion strengthened aluminum alloy has Egg/strength =
1001mm, UTSESGGMPa, Youngs modulus * 7 Pa shear
modulus 28GPa and atomic radius 012511111. Estimate the
average distance between s
Please write legibly. Some useful numbers: 0.155,0.225.0.414.0.732, 1.0,
Avogadro's constant = 6.02x 1023.
I. In zirconium oxide, each Zr - ion has radius O.079nm and each oxide (0 2.) has
radius O.140nm. Fill in the blanks below.
1. The following data relate to a tensile test on a cylindrical sample of a ductile material
with the following specifications: Initial gauge length: 50.00 mm
Initial diameter: 10.00 mm
.-,- _ . -
At the point during the test when a neck first started to
1. Gallium phosphide, GaP, is used in red, orange and green LED lamps. GaP is
cubic with lattice parameter a = 0.545nm. If nearest neighbor atoms are at 0,0,0
and 1i4, 1i4, 1i4 what is the distance (in om) between them?
The equilibrium number of vacancies in Ni at 1123 K is 4.7x1022m-3. The atomic weight and
density of Ni at 1123K are 58.69 g/mol and 8.8 g/cm3. What is the vacancy formation energy of Ni?
The number of Ni sites in 1 m3 of sample at 1123 K is:
Atomic Structure &
W EI C HEN
9/ 30/ 2016
Classification of materials and properties
THE STRUCTURE OF CRYSTALLINE SOLIDS
3.1 What is the difference between atomic structure and crystal structure?
Atomic structure relates to the number of protons and neutrons in the nucleus of an atom, as well as the
DISLOCATIONS AND STRENGTHENING MECHANISMS
7.1 To provide some perspective on the dimensions of atomic defects, consider a metal specimen with a
dislocation density of 105 mm2. Suppose that all the dislocations in 1000 mm3 (1 c
IMPERFECTIONS IN SOLIDS
4.1 The equilibrium fraction of lattice sites that are vacant in silver (Ag) at 700 C is 2 106. Calculate
the number of vacancies (per meter cubed) at 700C. Assume a density of 10.35 g/cm3 for Ag.
5.1 Briefly explain the difference between self-diffusion and interdiffusion.
Self-diffusion is atomic migration in pure metals-i.e., when all atoms exchanging positions are of the same
type. Interdiffusion is
MECHANICAL PROPERTIES OF METALS
6.4 A cylindrical specimen of a nickel alloy having an elastic modulus of 207 GPa (30 10 6 psi) and an
original diameter of 10.2 mm (0.40 in.) experiences only elastic deformation when a tensile
MS 201: Materials Science
February 8, 2017
1. The potential energy curve between two isolated atoms with ionic bonding as a function of their distance is shown
below. Briefly explain what causes the attractive energy
ATOMIC STRUCTURE AND INTERATOMIC BONDING
2.13 Without consulting Figure 2.8 or Table 2.2, determine whether each of the following electron
configurations is an inert gas, a halogen, an alkali metal, an alkaline earth metal, or
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Materials Science 201 Sample Final Exam
USE THESE DATA: Electron charge = -1.6x10-19 coul. Boltzmann constant = 86.2x10-6eV/K. Avogadro's
Constant = 6.02x1023. Electron mobility in Si = 0.14 m2/V.sec, hole mobility = 0.038 m2/V.sec. There are
Materials Science 201 Homework 9
Reading: Chapters 10, 11
See Chapter 9 for phase diagrams needed for these problems. All compositions are weight %
unless otherwise specified.
What are the equilibrium phases in brass containing 35% Zn (by weight) at: 1
MS201 Homework 2 Solutions:
1. Look up ionic radii in Appendix 2 and use the radius ratio rules of Table 2.1
BeO - 4, RbF 12 or 8*, MgO 6, FeO = 6, SiO2 = 4. To maintain stoichiometry
the O must have 2 Si neighbors in SiO2.
* note that although Rb can sup