Chapter 8

Question 1

slip

Answer 1

plastic deformation by motion of dislocations

Question 2

caterpillar locomotion

Answer 2

hump formed and propelled by lifting and shifting of leg pairs

Question 3

dislocation motion

Answer 3

movement of extra half-plane of atoms by breaking and reforming of interatomic bonds

Question 4

edge dislocation

Answer 4

in direction of applied shear stress

Question 5

screw dislocation

Answer 5

perpendicular to direction of applied shear stress

Question 6

Metal Dislocation Characteristics (3)

Answer 6

• Relatively easy dislocation motion
• Non-directional metallic bonding
• Close-packed planes and directions for slip

Question 7

Covalently Bonded Ceramics Dislocation Characteristics (2)

Answer 7

• Relatively difficult dislocation motion
• Directional covalent bonding

Question 8

Ionically Bonded Ceramics Dislocation Characteristics (2)

Answer 8

• Relatively difficult dislocation motion
• Few slip systems

Question 9

slip system

Answer 9

combination of slip plane and slip direction

Question 10

slip plane

Answer 10

plane with high planar density on which slip occurs most easily

Question 11

slip direction

Answer 11

direction with high linear density on which slip occurs most easily

Question 12

When does slip occur?

Answer 12

when resolved shear stress is greater than critical resolved shear stress