Mat Sci Test 2

Front 1

Increasing the temperature of a diffusion system will increase the diffusion rate. True or False

Back 1

False

Front 2

Carburized Steels are _______ Steels. Low-Carbon or High Carbon.

Back 2

Low-Carbon

Front 3

Steady-State diffusion in which conditions do not change with time is not commonly encountered with engineering materials. True or False

Back 3

True

Front 4

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.

Back 4

Second

Front 5

The error function, erf, is a methematical function existing by agreed definition and is used in some solutions of Fick's ______ Law.

Back 5

Second

Front 6

Flux is the number of atoms or other diffusing species passing through a plane of unit area per unit time. True or False

Back 6

True

Front 7

Interstitial Diffusion is diffusion of small atoms in opposite directions. True or False

Back 7

True

Front 8

Self-Diffusion is diffusion that occurs for pure metals. True or False

Back 8

True

Front 9

The magnitude of the diffusion coefficient D is indicative of the rated at which atoms diffuse. True or False

Back 9

True

Front 10

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

Back 10

True

Front 11

The _____ test is used to evaluate the strength of metals and alloys.

Back 11

Tensile

Front 12

For metals with a thick cross section such as plate, a _____ round specimen is commonly used.

Back 12

0.5 inch diameter

Front 13

The Young's Modulus is related to the bonding strength between the atoms in a metal or alloy. True or False

Back 13

True

Front 14

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

Back 14

False

Front 15

The _____ strength is the maximum strength reached in the engineering stress-strain curve.

Back 15

Ultimate Tensile

Front 16

______ working of metals causes a metal to be strain-hardened.

Back 16

Cold

Front 17

______ strength is the stress at which a specific amount of strain occurs in the engineering tensile test.

Back 17

Yield

Front 18

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:

Back 18

Hooke's

Front 19

The _____ strength is the maximum strength reached in the engineering stress-strain curve.

Back 19

Ultimate Tensile

Front 20

The true stress is _____ than the engineering stress. Higher or Lower

Back 20

Higher

Front 21

_____ is the first stage in the annealing process that results in the removal of residual stresses and formation of low-energy dislocation configurations.

Back 21

Recovery

Front 22

_____ relationship is an empirical equation that relates the strength of a metal to its grain size.

Back 22

Hall-Petch

Front 23

Recrystallization is a process that does not depend on temperature and time.

Back 23

False

Front 24

During plastic deformation, the number of dislocations decreases dramatically. True or False

Back 24

False

Front 25

Recrystallization proceeds more rapidly in alloys than in pure metals. True or False

Back 25

False

Front 26

The _____ fracture of a metal occurs after extensive plastic deformation and is characterized by slow crack propagation.

Back 26

Ductile

Front 27

The transition from brittle to ductile behavior is called a ductile to brittle transition. True or False

Back 27

False

Front 28

_____ is a measure of the amount of energy a material can absorb before fracture.

Back 28

Toughness

Front 29

_____ is the third stage of the annealing process in which new grains start to grow in an equiaxed manner.

Back 29

Recovery

Front 30

_____ fracture is a mode of fracture characterized by rapid crack propagation.

Back 30

Brittle

Front 31

A graph showing the relationship between the applied stress and the number of cycles to failure in fatigue is _____.

Back 31

SN

Front 32

Fracture toughness is the resistance of a material to failure in the presence of a flaw. True or False

Back 32

True

Front 33

_____ is a qualitative measure of the energy required to cause fracture of a material.

Back 33

Toughness

Front 34

Fatigue life is the number of cycles permitted at a particular stress before a material fails by fatigue. True or False

Back 34

True

Front 35

Larson-Miller parameter used to relate the stress, temperature, and rupture time in fatigue. True or False

Back 35

False

Front 36

Fatigue is the weakening or breakdown of a material subject to _____.

Back 36

Cyclic

Front 37

Majority of _____ base fatigue tests are performed using fully reversed loading conditions.

Back 37

Strain

Front 38

The _____ amplitude is generally plotted against the number of cycles to failure on the linear-log scale.

Back 38

Stress

Front 39

Preexisting flaws or cracks within a material component _____ the crack initiation part of the fatigue life of a component.

Back 39

Reduce

Front 40

Range of stress is the difference between the maximum and mean stresses. True or False

Back 40

False