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