Chapter 7 (Dislocations & Strengthening) Flashcards

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1
Q

in what type of material are dislocations most commonly found?

A

Metals

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2
Q

why are metals more prone to dislocations?

A
  1. because of non-directional bonding

2. because they are closed packed

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3
Q

why are covalent materials less prone to dislocations

A

because of their angular bonding

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4
Q

what type of deformations are caused by plastic deformation?

A

Plastic deformations

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5
Q

what requires LESS STRESS breaking a material or deforming it.

A

Deforming it

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6
Q

what is a slip system comprised of

A

a slip direction and a slip plane

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7
Q

which planes are typically favored by slip systems

A

the more closely packed ones; eg FCC

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8
Q

what can be said about same sign dislocations versus opposite sign dislocations

A

same signs repel, opposite signs attract and annihilate upon joining (no more dislocation)

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9
Q

give an example of a slip system for FCC

A

{111},

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10
Q

why are HCP metals brittle

A

because they have FEW slip systems

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11
Q

what can be said about ionically bonded materials regarding slip

A

they are able to resist slip due to disruptions in charge balance

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