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MATSE 259 Exam 1 PSU With Complete Solutions

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MATSE 259 Exam 1 PSU With Complete Solutions Elastic Modulus (e) measure of stiffness, or a material's resistance to elastic deformation ... slope of elastic portion of stress-strain curve Crystalline Materials small group of atoms that are repeated by translation to form 3-D arrangements...

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  • June 7, 2024
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  • 2023/2024
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MATSE 259 Exam 1 PSU With Complete
Solutions
Elastic Modulus (e)
measure of stiffness, or a material's resistance to elastic deformation ... slope of elastic portion of
stress-strain curve



Crystalline Materials
small group of atoms that are repeated by translation to form 3-D arrangements



Antisotropic
properties that vary with direction. Ex: E(edge) isn't equal to E(diagonal)



Polycrystal
properties that may or may not vary with direction



Isotropic
the grains are randomly orientated



The Three Crystal Structures
Body Centered Cubic (BCC), Face Centered Cubic (FCC), Hexagonal Centered Prism (HCP)



Co-ordination Numbers
number of atoms in a crystal lattice touching a given atom



Co-ordination Numbers for each Structure
BCC = 8 FCC = 12 HCP = 12



Polymorphism
same atoms can have more than one crystal structure



Close Packed Structures
atoms in close touch as many as possible.



Which crystal structures are tightly packed vs ones that aren't?
BCC is NOT packed compared to HCP and FCC (most packed)

, FCC layer structure
A, B, C repeat



HCP layer structure
A, B repeat



Linear Density
Linear Density = # of atoms/ unit length of the vector



Planar Density
density across a plane; # of atoms in the plane/area of plane



What are the three type of point defects?
Vacancies, Interstitial Atoms, Substitutional Atoms



Vacancies
very important during diffusion!! Basically open spots in the plane



Substitutional Atoms
these make solid solutions if atoms can bond together must follow of one these rules;



Interstitional
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
extra plane of atoms inserted into the crystal



Burgers Vector
measure of lattice distortion, perpendicular to distortion line



Screw Dislocation
material is twisted so some atoms are above and below each other

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