Exam (elaborations)
MATSE PRACTICE EXAM
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MATSE PRACTICE EXAM...
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Impurity atoms - ANSWER Atoms that are purposely added to changethe material properties, such as material strength, ductility, corrosion
resistance. Ex: Sterling Silver (92% Silver, 8% Copper for strength)
Ductile - ANSWER the ability of a material to undergo significant plastic
deformation before fracture. measured by the material's ability to stretch,
bend, or elongate under tensile stress without breaking (how flexible)
Point Defects - ANSWER Vacancy Atoms
Self Interstitial Atoms
Substitutional atoms
Interstitial Atoms
Dislocation - ANSWER Line Defects
Area Defects - ANSWER grain boundaries, twin boundaries, stacking
fault
Vacancies - ANSWER Vacant atomic sites in structure
Self-Interstitials - ANSWER extra atoms positioned in between atomic
sites, same type of atoms
Subsitional Impurities - ANSWER Swaps out an atom for a impure atom
or seperate atom
Impurities - ANSWER Atoms that are not pure or do not match the
original atom composition
Interstitional Impurity Atom - ANSWER Inserts themselves in a spot not
common to the structure and is also not the same type of atom as the
rest of the atom
, Impurities in Solids - ANSWER No pure metal will ever be 100% pure,
normally the max is 99.999%
How much impurities at this level in 1m^3 ? - ANSWER 10^22 or 10^23
in 1m^3
Solid Imperfections - ANSWER Edge Dislocations
Screw Dislocations
Mixed Dislocations
Burgers Vector (b) - ANSWER measure of lattice distortions
Questions about Solid Imperfections - ANSWER Description of the
dislocation
Orientation of dislocation line with respect to Burgers line
Types of stress/strains created around the dislocation
How the dislocation will move when subjected to shear stress
Edge Dislocation - ANSWER extra half plane inserted, dislocation line is
into the paper
b is perpendicular to the dislocation line
What type of strain does edge dislocations introduce - ANSWER
Compressive, Tensile, and shear lattice strains
What type of strain is produced in screw dislocations? - ANSWER Shear
Strain Only
What happens when shear stress is applied to the side of the atom
structure? - ANSWER Dislocation move till it is pushed out of the
structure
Screw dislocations reaction - ANSWER The lattice is sheared and part
of the lattice is offset by a distance equals to the magnitude of burger
vector. Burgers vector is parrallel to the dislocation line
asformed definition - ANSWER condition or state of a material
immediately after it has undergone a forming process, such as forging,
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