Recent Lessons

Show all results for ""

Plastic Deformation Historical Background

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the main mechanism of plastic deformation?

Linear crystalline defects
Breaking of inter atomic bonds
Motion of numerous dislocations (correct)
Sliding of atomic planes

What was the misconception in the 1900s regarding plastic deformation?

Motion of numerous dislocations
Sliding of atomic planes (correct)
Breaking of inter atomic bonds
Linear crystalline defects

What was the flaw in the 1930s theory regarding plastic deformation?

Breaking of inter atomic bonds
Sliding of atomic planes (correct)
Measurement of theoretical shear strength
Linear crystalline defects

How is plastic deformation mainly carried out through the lattice?

Motion of numerous dislocations (D) Signup and view all the answers

What enabled the establishment of the existence of linear crystalline defects in the 1950s?

Electron microscopy (C) Signup and view all the answers

What is the term used for the process of an edge dislocation slipping through the crystal lattice?

Dislocation slipping (B) Signup and view all the answers

What is the significance of dislocations in materials with almost perfect crystal structure?

They enable plastic deformation by the movement of dislocations through the lattice (C) Signup and view all the answers

What is the Burgers vector in the context of dislocations?

The direction and magnitude of distance the atoms move each unit step motion (D) Signup and view all the answers

What does slip refer to in the context of materials?

The plastic deformation of a material by the movement of dislocations through the lattice (B) Signup and view all the answers

What is dislocation density (rD) a measure of?

The length of dislocations per unit volume (C) Signup and view all the answers

How does a dislocation choose its slip direction?

By moving in a direction that has the highest density of atoms (A) Signup and view all the answers

What is a possible slip direction in an FCC unit cell?

$1/2 \sqrt{3}~a$ (D) Signup and view all the answers

How does a dislocation choose its slip plane?

By moving in close-packed planes that are easier to slip (A) Signup and view all the answers

What is a possible slip plane in an FCC unit cell?

$(100)$ (C) Signup and view all the answers

What is a whisker in materials science?

A thin single crystal with a high degree of crystalline perfection and exceptional strength (D) Signup and view all the answers

What would happen to an iron bar if dislocations were not present?

It would become weaker and more brittle (C) Signup and view all the answers

Flashcards are hidden until you start studying