MSE 250 Final Exam Questions With
Verified Answers
Type of bonding in metals - Answers✔metallic
arrangement of metals - Answers✔crystalline arrangement (orderly)
other characteristics of metals - Answers✔strong, stiff, ductile, resistant to fracture
high thermal and electrical conductivity
kind of bonding in ceramics - Answers✔ionic
characteristics of ceramics - Answers✔strong stiff BUT brittle
insulating
often chemically inert (nonreactive)
kind of bonding in polymers - Answers✔covalent bonding with a carbon chain backbone
characteristics of polymers - Answers✔soft ductile low strength low density
insulating
amorphous arrangement (non-orderly)
what five things can a tensile test measure (SSDTH) - Answers✔strength stiffness ductility
toughness and hardness
TRUE stress and strain is dependent on what? - Answers✔geometry
Stress is represented by what variable and is on which axis of a stress strain curve? -
Answers✔sigma and y-axis and in MPa
strain is represented by what variable and is on which axis of a stress strain curve? -
Answers✔cursive e thing and x axis
substitutional impurity - Answers✔usual lattice sites, same size atoms and crystal structure
interstitial impurity - Answers✔sits between usual lattice sits, atoms must be smaller that host
atoms
covalent bond difference in electronegativity - Answers✔large
covalent bond does what with its electrons - Answers✔shares them
metallic bond difference in electronegativity - Answers✔small
metallic bond does what with its electrons - Answers✔shares them
ionic bond difference in electronegativity - Answers✔large
ionic bond does what with its electrons - Answers✔transfers them
polymorphism - Answers✔having more than one crystal structure
allotropy - Answers✔polymorphism in elements
what three things can you get from phase diagrams - Answers✔phases present phase composition
and amounts of each phase
twinning - Answers✔when two lattice orientations are mirror images across their dividing line
grain size reduction - Answers✔grain boundaries act as obstacles to moving dislocations (dec in
grain size leads to inc in total length of grain boundary)
solid solution strengthening - Answers✔impurities/alloying elements usually induce
compressive/tensive stress because of size differences
precipitation hardening - Answers✔enough impurity atoms concentrate together to form a second
phase particle
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