mat e|174 unit 2 test Quiz Questions Perfectly Answered|19 Pages
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Course
Mat e
Institution
Mat E
-Annealing of martensite to form tempered martensite
-Cooling of austenite to form pearlite
-Cooling of austenite to form proeutectoid ferrite - ️️Which of the following is/are examples of nucleation and growth phase transformations?
-Quenching of austenite to form martensite
-Annealing o...
mat e|174 unit 2 test Quiz Questions
Perfectly Answered
-Annealing of martensite to form tempered martensite
-Cooling of austenite to form pearlite
-Cooling of austenite to form proeutectoid ferrite - ✔ ✔ Which of the following is/are examples of
nucleation and growth phase transformations?
-Quenching of austenite to form martensite
-Annealing of martensite to form tempered martensite
-Cooling of austenite to form pearlite
-Cooling of austenite to form proeutectoid ferrite
(001) [100]
(001) [010]
(010) [100]
(010) [001]
(100) [010]
(100) [001] - ✔ ✔ If a single crystal of Po is loaded in tension along the [001] axis of the crystal,
which of the following candidate slip systems features a resolved shear stress of zero? (draw it out)
(110) [1 1 1] - ✔ ✔ If a BCC single crystal is loaded along the [001] axis, which of the following
candidate slip systems is the least likely to experience slip?
<100>{100} - ✔ ✔ What is the expected slip system for the simple cubic crystal structure ?
0.28 - ✔ ✔ A cylindrical specimen of a metal alloy is stressed elastically in tension.
The original diameter was 8 mm and a force of 15,700 N produces a reduction in diameter of 5x10-3 mm
(magnitude).
Compute Poisson's ratio for this alloy if its modulus of elasticity is 140 GPa.
,0.53 - ✔ ✔ A 25 mm diameter cylindrical rod fabricated from 2014-T6 aluminum is subjected to
repeated load cycling along its axis. If the part experiences sinusoidal loading between limits of 50 MPa
of compression and 350 MPa tension, how long will the part survive this stress cycling? The loading
frequency is 0.06 Hz. (cycles to failure=10^7N)
1.) a higher number of slip systems than HCP
2.) spatially diverse preferred slip planes (whereas the preferred slip systems in HCP are not spatially
diverse). - ✔ ✔ Metals with FCC packing (like aluminum) are often more ductile than metals with
HCP packing (like magnesium), because the FCC structure has:
17.7 MPa - ✔ ✔ For an alumina specimen, what is the minimum stress at which failure is expected to
occur, in MPa, if it features an elliptical internal void whose length is 4.86 mm and whose tip radius of
curvature is 190 nm?
210 - ✔ ✔ If a tensile stress of 420 MPa is applied along the [110] direction of a Po single crystal,
what is the resolved shear stress for the (010) [100] slip system?
241 MPa - ✔ ✔ If a steel cylindrical specimen is stressed nominally to 53 MPa, what stress level
exists at the tip of an elliptical surface flaw, whose length is 5.5 microns and radius of curvature is 1,062
nanometers?
300 GPa - ✔ ✔ Which of the following is a reasonable value for the elastic modulus of a typical
structural metal?
3 MPa
30 MPa
300 MPa
3000 MPa
3 GPa
300 GPa
3000 GPa
400 MPa - ✔ ✔ Which of the following is a reasonable value for the yield stress (yield point) of a
typical structural metal?
84 - ✔ ✔ If a Hastelloy X superalloy (FCC solid-solution single-crystal) is loaded to 206 MPa along its
major axis, what is the resolved shear stress along the [011] direction on the (1 1 1) plane?
, all answers but: spheroidite, martensite, pearlite, and bainite - ✔ ✔ Consider each option below
separately.
If the description within a given option is potentially an equilibrium phase in the Fe-Fe3C system
between 0oC and 1600oC, include the option in your response.
all of them except for g - ✔ ✔ For diffusion-controlled (e.g. nucleation & growth) transformations in
general, the exact temperature at which a transformation proceeds (for isothermal transformations), or
the exact rate at which a specimen's temperature is changed (for cases of an imposed heating or cooling
rate) can influence what aspects of a phase transformation's outcome?
a. the identity of the phase(s) that form
b. the rate of transformation
c. the amount of time required for the transformation to actually commence
d. the elapsed time of the transformation itself (measured from commencement to termination)
e. the microstructure(s) that form(s)
f. the properties of the material after transformation
g. the most thermodynamically stable state that the system could adopt, if provided the opportunity
all of these - ✔ ✔ Which of the following are possibilities related to annealing and subsequent
cooling of a simple polycrystalline material (e.g. single-component & single-phase metal)?
recrystallization
recovery
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