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MATSE 259 Exam 1 PSU with complete solutions 2024_2025.
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MATSE 259 Exam 1 PSU with complete solutions 2024_2025.
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MATSE 259 Exam 1 PSU with completesolutions 2024/2025
Elastic Modulus (e) - ANSWER✓✓-measure of stiffness, or a
material's resistance to elastic deformation ... slope of elastic
portion of stress-strain curve
Crystalline Materials - ANSWER✓✓-small group of atoms that are
repeated by translation to form 3-D arrangements
Anisotropic - ANSWER✓✓-properties that vary with direction. Ex:
E(edge) isn't equal to E(diagonal)
Polycrystal - ANSWER✓✓-properties that may or may not vary with
direction
Isotropic - ANSWER✓✓-the grains are randomly orientated
The Three Crystal Structures - ANSWER✓✓-Body Centered Cubic
(BCC), Face Centered Cubic (FCC), Hexagonal Centered Prism (HCP)
Co-ordination Numbers - ANSWER✓✓-number of atoms in a crystal
lattice touching a given atom
Co-ordination Numbers for each Structure - ANSWER✓✓-BCC = 8 FCC
= 12 HCP = 12
Polymorphism - ANSWER✓✓-same atoms can have more than one
crystal structure
, Close Packed Structures - ANSWER✓✓-atoms in close touch as many
as possible.
Which crystal structures are tightly packed vs ones that aren't? -
ANSWER✓✓-BCC is NOT packed compared to HCP and FCC (most
packed)
FCC layer structure - ANSWER✓✓-A, B, C repeat
HCP layer structure - ANSWER✓✓-A, B repeat
Linear Density - ANSWER✓✓-Linear Density = # of atoms/ unit
length of the vector
Planar Density - ANSWER✓✓-density across a plane; # of atoms in
the plane/area of plane
What are the three type of point defects? - ANSWER✓✓-Vacancies,
Interstitial Atoms, Substitutional Atoms
Vacancies - ANSWER✓✓-very important during diffusion!! Basically
open spots in the plane
Substitutional Atoms - ANSWER✓✓-these make solid solutions if
atoms can bond together must follow of one these rules;
Interstitional - ANSWER✓✓-makes solid solutions; if the alloying
atom is very small it'll sit in between small crevices of the plane.
Usually happens with H,C,O,N.
Edge Dislocation - ANSWER✓✓-extra plane of atoms inserted into
the crystal
Burgers Vector - ANSWER✓✓-measure of lattice distortion,
perpendicular to distortion line
Screw Dislocation - ANSWER✓✓-material is twisted so some atoms
are above and below each other
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