MATSE 259 Exam 1 PSU Ques ons and answers Newest
RATED A+ 2025/2026 NEW!!
Elas c Modulus (e) - Ans measure of s ffness, or a material's resistance to elas c deforma on
... slope of elas c por on of stress-strain curve
Crystalline Materials - Ans small group of atoms that are repeated by transla on to form 3-D
arrangements
An sotropic - Ans proper es that vary with direc on. Ex: E(edge) isn't equal to E(diagonal)
Polycrystal - Ans proper es that may or may not vary with direc on
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-ordina on Numbers - Ans number of atoms in a crystal la0ce touching a given atom
Co-ordina on 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 ghtly packed vs ones that aren't? - Ans BCC is NOT packed
compared to HCP and FCC (most packed)
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, Inters al Atoms, Subs tu onal
Atoms
Vacancies - Ans very important during diffusion!! Basically open spots in the plane
Subs tu onal Atoms - Ans these make solid solu ons if atoms can bond together must follow
of one these rules;
Inters onal - Ans makes solid solu ons; 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 Disloca on - Ans extra plane of atoms inserted into the crystal
Burgers Vector - Ans measure of la0ce distor on, perpendicular to distor on line
Screw Disloca on - Ans material is twisted so some atoms are above and below each other
RATED A+ 2025/2026 NEW!!
Elas c Modulus (e) - Ans measure of s ffness, or a material's resistance to elas c deforma on
... slope of elas c por on of stress-strain curve
Crystalline Materials - Ans small group of atoms that are repeated by transla on to form 3-D
arrangements
An sotropic - Ans proper es that vary with direc on. Ex: E(edge) isn't equal to E(diagonal)
Polycrystal - Ans proper es that may or may not vary with direc on
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-ordina on Numbers - Ans number of atoms in a crystal la0ce touching a given atom
Co-ordina on 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 ghtly packed vs ones that aren't? - Ans BCC is NOT packed
compared to HCP and FCC (most packed)
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, Inters al Atoms, Subs tu onal
Atoms
Vacancies - Ans very important during diffusion!! Basically open spots in the plane
Subs tu onal Atoms - Ans these make solid solu ons if atoms can bond together must follow
of one these rules;
Inters onal - Ans makes solid solu ons; 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 Disloca on - Ans extra plane of atoms inserted into the crystal
Burgers Vector - Ans measure of la0ce distor on, perpendicular to distor on line
Screw Disloca on - Ans material is twisted so some atoms are above and below each other
