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Quiz 2 with Answer Key - Metal Science and Engineering | MSE 250, Quizzes of Materials science

Michigan State University (MSU)Materials science

Material Type: Quiz; Class: Matl Science and Engineering; Subject: Materials Sci and Engineering; University: Michigan State University; Term: Fall 2017;

Typology: Quizzes

2016/2017
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MSE 250 – Quiz 2
October 9, 2017
Student Name:
Student ID:
Section:
1. Determine the Miller indices for the direction illustrated in the left unit cell and for the plane
illustrated in the right one.
6 pts Answer [1 0 1],(1 0 1)
y
z
x
1/2
1/2
y
z
x
1/2
1/2
2. What is the character of the dislocation at point A and point B in the figure below?
2 pts
pf3
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Download Quiz 2 with Answer Key - Metal Science and Engineering | MSE 250 and more Quizzes Materials science in PDF only on Docsity!

MSE 250 – Quiz 2

October 9, 2017

Student Name:

Student ID:

Section:

  1. Determine the Miller indices for the direction illustrated in the left unit cell and for the plane illustrated in the right one. 6 pts Answer [1 0 1], (1 0 1)

y

z

x

1/

1/ y

z

x

1/

1/

  1. What is the character of the dislocation at point A and point B in the figure below?

2 pts

Answer Point A: edge dislocation; Point B: screw dislocation

  1. a) In the space below, draw the atomic arrangement of the (1 1 0) plane for a body-centered cubic (BCC) crystal structure. Only draw atoms that have their centers in the plane, represent the atoms as hard spheres and show clearly where the atoms do and do not touch! Please indicate the unit cell parameter a in your drawing! 4 pts Answer

The atoms touch along the body diagonal but not along the edges of the cube. b) Calculate the volume of the unit cell for iron, knowing that it has a BCC crystal structure and an atomic radius of 0.126 nm. 4 pts Answer

a =

R

Viron = a^3 = (

R)^3 = (

× 0.126 nm)^3 = 2.46 × 10 −^2 nm^3

c) How many atoms belong to this BCC unit cell (atoms/unit cell)? 1 pts Answer 2

  1. For each of the three primary bond types answer the following questions. Does the bond type involve elements with large or small difference in electronegativity? Are the bonding electrons shared or transferred? Is the bond directional or non-directional?

Primary Bond difference in elec- tronegativity

electrons directionality

12 pts