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Matse Exam 2 -Questions and Answers 100% Pass/Verified
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Matse Exam 2 -Questions and Answers 100% Pass/Verified
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Matse Exam 2 -Questions and Answers 100% Pass/VerifiedSlip - ✔✔Produces plastic deformation by dislocation motion.
Slip Planes - ✔✔Crystallographic plane along which the dislocation line traverses.
Dislocations move along proffered slip planes - ✔✔-Dislocations do not move with the same
degree of ease on all crystallographic plance and in all crystallographic directions
-There is ordinarily a preffered plane
Slip System - ✔✔Combination of slip plane and direction. Depends on crystal structure of
the metal
minimum - ✔✔The atomic ditortion that accompanies the motion of a dislocation within the
sslip system
slip planes - ✔✔have densest atomic packing
slip directions - ✔✔corresponds to the most closely packed direction
twinning - ✔✔a shear force can produce atomic displacements such that atoms on one side
of the plane are mirror images to the other side of the plane
Displacement magnitude within the twin region is - ✔✔proportional to the distance from
the twin plane
Twinning occurs on a - ✔✔definite crystallographic plane and in a specific direction that
depend on crystal structure.
-Occurs in BCC and HCP structures
-Low temps and at high rates of loading
, Slip - ✔✔-crystallographic orientation above and below slip plane is the same before and
after deformation
-slip occurs in distinct atomic spacing
twinning - ✔✔-reorientation across twin plane
-atomic displacement for twinning is less than inter-atomic separation
-Occurs in conditions where slip is restricted
-Amount of bulk plastic deformation is normally small relative to slip
Grain size in a polycrystalline metal influence - ✔✔Avg grain diameter
- Machine properties
Grain boundaries act as barriers to - ✔✔dislocation motion
Two facts about grain size - ✔✔-since two grains have different orientations, dislocation
passing through must change direction of motion...becomes more difficult as
crystallographic misorientation increases
-Atomic disorder within a grain boundary will result in a discontinuity of slip planes from one
grain to another
Recovery, Recrystallization, and Grain Growth - ✔✔Properties and structures formed by
cold-working can be removed by heat treatments at elevated temperatures
Recovery - ✔✔some of the stored internal strain energy is relieved by dislocation motion, as
a result of enhanced atomic diffusion at elevated temperatures
Recrystallization - ✔✔After recovery is complete, grains are still in a relatively high energy
state. A new set of strain-free and equiaxed grains forms with low dislocation densities and
are characteristic of pre-cold worked conditions.
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