MSE 2090 Exam Questions with
Complete Solutions
dislocation line - ANSWER-line that extends beyond the extra half plane for an edge
dislocation and through the center of the spiral for a screw dislocation
burgers vector direction for edge dislocation - ANSWER-perpendicular
burgers vector direction for screw dislocation - ANSWER-parallel
The polymorphic structures of carbon are diamond and graphite - ANSWER-Name the
polymorphic structures of carbon
-describe the main differences among ionic, covalent, and metallic metalic bonding -
ANSWER-Ionic bonding is when a nonmetal and a metal bond together. The metal
gives up an electron to the nonmetal to fill its outer shell this bond is non directional
-Covalent bonding is when only nonmetals bond together and share electrons. This
bond is directional.
-Metallic bonding is when two metals bond together resulting in a sea of electrons this
bond is non directional Briefly
Name define and give exampled of
-Point Defects
-linear Defects
-Interfacial/3D defects - ANSWER-1. interstitial and vacancies
2. edge, screw, and mixed dislocations
3. External surface, grain boundary, second phase precipitation,
-Metallic
-Covalant & Van derWaals
-Ionic......
-Van derWaals......
-Covalent.... - ANSWER-Types of bonding
Brass
Rubber
Barium sulfide
Solid xenon
Nylon
Linear density - ANSWER-number of atoms centered on a directional vector
--------------------------------------------------------
length of directional vector
planar density - ANSWER-Number of atoms centered on a plane
, --------------------------------------------------------
Area of plane
Braggs law - ANSWER-the law
nλ=2dhkl sinΘ
The directionality of properties is define as - ANSWER-Anisotropy, the direction of
which the atoms are lined up against
Coordination number in a crystalline structure is define as the - ANSWER-number of
atoms in the neighborhood of it
irregularities in on otherwise continuously repeating pattern of atomic positions -
ANSWER-Crystalline defect
load distributed over the current cross sectional area of a material, current area is
calculated using the dimensions of the material as deformation occurs - ANSWER-True
Stress
a polymer which will soften and eventually melt with increasing temperature. -
ANSWER-thermoplastic polymer
a polymer which will not soften or melt with increasing temperature. - ANSWER-
thermoset polymer
polymers which experience extremely long elastic deformations - ANSWER-elastomer
primary covalent bonding which connects polymer macromolecules to each other at
various points throughout the length of the macromolecules - ANSWER-crosslinking
Dissolved impurity atoms which fit between the larger atoms of the solvent material -
ANSWER-Interstitial solid solution
dissolved impurity atms with large enough radii to take the place of the atoms of the
solvent material in the crystal structure - ANSWER-substitutional solid solution
the ability of solid material to exist in more than one form - ANSWER-polymorphism
Iron-Carbon solid solution with relatively high carbon content. - ANSWER-Cast iron
Relatively large, thin alternating lamplac of ferrite and cementite - ANSWER-Pearlite
Steel formed by quenching austenite steel. The (FCC) austenite becomes (BCT)
martensite. Hard and brittle due to the higher strain energy. - ANSWER-martensite
Creep, fatigue, corrosion - ANSWER-Name three usual causes of metal failure
Complete Solutions
dislocation line - ANSWER-line that extends beyond the extra half plane for an edge
dislocation and through the center of the spiral for a screw dislocation
burgers vector direction for edge dislocation - ANSWER-perpendicular
burgers vector direction for screw dislocation - ANSWER-parallel
The polymorphic structures of carbon are diamond and graphite - ANSWER-Name the
polymorphic structures of carbon
-describe the main differences among ionic, covalent, and metallic metalic bonding -
ANSWER-Ionic bonding is when a nonmetal and a metal bond together. The metal
gives up an electron to the nonmetal to fill its outer shell this bond is non directional
-Covalent bonding is when only nonmetals bond together and share electrons. This
bond is directional.
-Metallic bonding is when two metals bond together resulting in a sea of electrons this
bond is non directional Briefly
Name define and give exampled of
-Point Defects
-linear Defects
-Interfacial/3D defects - ANSWER-1. interstitial and vacancies
2. edge, screw, and mixed dislocations
3. External surface, grain boundary, second phase precipitation,
-Metallic
-Covalant & Van derWaals
-Ionic......
-Van derWaals......
-Covalent.... - ANSWER-Types of bonding
Brass
Rubber
Barium sulfide
Solid xenon
Nylon
Linear density - ANSWER-number of atoms centered on a directional vector
--------------------------------------------------------
length of directional vector
planar density - ANSWER-Number of atoms centered on a plane
, --------------------------------------------------------
Area of plane
Braggs law - ANSWER-the law
nλ=2dhkl sinΘ
The directionality of properties is define as - ANSWER-Anisotropy, the direction of
which the atoms are lined up against
Coordination number in a crystalline structure is define as the - ANSWER-number of
atoms in the neighborhood of it
irregularities in on otherwise continuously repeating pattern of atomic positions -
ANSWER-Crystalline defect
load distributed over the current cross sectional area of a material, current area is
calculated using the dimensions of the material as deformation occurs - ANSWER-True
Stress
a polymer which will soften and eventually melt with increasing temperature. -
ANSWER-thermoplastic polymer
a polymer which will not soften or melt with increasing temperature. - ANSWER-
thermoset polymer
polymers which experience extremely long elastic deformations - ANSWER-elastomer
primary covalent bonding which connects polymer macromolecules to each other at
various points throughout the length of the macromolecules - ANSWER-crosslinking
Dissolved impurity atoms which fit between the larger atoms of the solvent material -
ANSWER-Interstitial solid solution
dissolved impurity atms with large enough radii to take the place of the atoms of the
solvent material in the crystal structure - ANSWER-substitutional solid solution
the ability of solid material to exist in more than one form - ANSWER-polymorphism
Iron-Carbon solid solution with relatively high carbon content. - ANSWER-Cast iron
Relatively large, thin alternating lamplac of ferrite and cementite - ANSWER-Pearlite
Steel formed by quenching austenite steel. The (FCC) austenite becomes (BCT)
martensite. Hard and brittle due to the higher strain energy. - ANSWER-martensite
Creep, fatigue, corrosion - ANSWER-Name three usual causes of metal failure
