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40 Cards in this Set
- Front
- Back
Increasing the temperature of a diffusion system will increase the diffusion rate. True or False
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False
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Carburized Steels are _______ Steels. Low-Carbon or High Carbon.
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Low-Carbon
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Steady-State diffusion in which conditions do not change with time is not commonly encountered with engineering materials. True or False
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True
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The ______ Fick's Law States that the rate of compositional change is equal to the diffusivity times the rate of change of the concentration gradient.
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Second
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The error function, erf, is a methematical function existing by agreed definition and is used in some solutions of Fick's ______ Law.
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Second
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Flux is the number of atoms or other diffusing species passing through a plane of unit area per unit time. True or False
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True
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Interstitial Diffusion is diffusion of small atoms in opposite directions. True or False
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True
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Self-Diffusion is diffusion that occurs for pure metals. True or False
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True
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The magnitude of the diffusion coefficient D is indicative of the rated at which atoms diffuse. True or False
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True
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Vacancy diffusion is the mechanism that involves the interchange of an atom from a normal lattice position to an adjacent vacant lattice site. True or False
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True
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The _____ test is used to evaluate the strength of metals and alloys.
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Tensile
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For metals with a thick cross section such as plate, a _____ round specimen is commonly used.
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0.5 inch diameter
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The Young's Modulus is related to the bonding strength between the atoms in a metal or alloy. True or False
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True
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The yield strength is a very important value for use in engineering structural design since it is the strength at which a metal or alloy shows insignificant plastic deformation. True or False
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False
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The _____ strength is the maximum strength reached in the engineering stress-strain curve.
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Ultimate Tensile
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______ working of metals causes a metal to be strain-hardened.
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Cold
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______ strength is the stress at which a specific amount of strain occurs in the engineering tensile test.
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Yield
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Metals and alloys show a linear relationship between stress and strain in the elastic region of the engineering stress-strain diagram, which is described by _____ law:
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Hooke's
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The _____ strength is the maximum strength reached in the engineering stress-strain curve.
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Ultimate Tensile
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The true stress is _____ than the engineering stress. Higher or Lower
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Higher
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_____ is the first stage in the annealing process that results in the removal of residual stresses and formation of low-energy dislocation configurations.
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Recovery
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_____ relationship is an empirical equation that relates the strength of a metal to its grain size.
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Hall-Petch
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Recrystallization is a process that does not depend on temperature and time.
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False
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During plastic deformation, the number of dislocations decreases dramatically. True or False
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False
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Recrystallization proceeds more rapidly in alloys than in pure metals. True or False
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False
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The _____ fracture of a metal occurs after extensive plastic deformation and is characterized by slow crack propagation.
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Ductile
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The transition from brittle to ductile behavior is called a ductile to brittle transition. True or False
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False
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_____ is a measure of the amount of energy a material can absorb before fracture.
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Toughness
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_____ is the third stage of the annealing process in which new grains start to grow in an equiaxed manner.
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Recovery
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_____ fracture is a mode of fracture characterized by rapid crack propagation.
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Brittle
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A graph showing the relationship between the applied stress and the number of cycles to failure in fatigue is _____.
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SN
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Fracture toughness is the resistance of a material to failure in the presence of a flaw. True or False
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True
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_____ is a qualitative measure of the energy required to cause fracture of a material.
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Toughness
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Fatigue life is the number of cycles permitted at a particular stress before a material fails by fatigue. True or False
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True
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Larson-Miller parameter used to relate the stress, temperature, and rupture time in fatigue. True or False
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False
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Fatigue is the weakening or breakdown of a material subject to _____.
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Cyclic
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Majority of _____ base fatigue tests are performed using fully reversed loading conditions.
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Strain
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The _____ amplitude is generally plotted against the number of cycles to failure on the linear-log scale.
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Stress
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Preexisting flaws or cracks within a material component _____ the crack initiation part of the fatigue life of a component.
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Reduce
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Range of stress is the difference between the maximum and mean stresses. True or False
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False
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