2019 | Lattice Defects and Dislocation

2019　Lattice Defects and Dislocation

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Academic unit or major: Undergraduate major in Materials Science and Engineering

Instructor(s): Fujii Toshiyuki Muraishi Shinji

Class Format: Lecture

Media-enhanced courses

Day/Period(Room No.): Tue3-4(S8-101) Fri3-4(S8-101)

Group: -

Course number: MAT.M303

Credits: 2

Academic year: 2019

Offered quarter: 2Q

Syllabus updated: 2019/3/18

Lecture notes updated: 2019/5/31

Language used: Japanese

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Course description and aims

Defects in crystalline solid plays important roles in strengthening of materials. This class aims to understand various crystaline defects, especially the fundamentals of dislocation related phenomena through the practice and execise.
Stress-strain curve, various strengthening mechanisms in metals are understood from the view point of dislocation theory.

Student learning outcomes

The aims of this class is to understand the fundamental properties of dislocation and various strengthning mechanism in terms of dislocation theory.

After this class, students will :
Be able to define kinds of defect in crystalline solid (vacancy, interstitial atoms, dislocation, grain boundary, etc.)
Have a knowledge of screw dislocation and edge dislocation.
Be able to compute the dislocation stress at field point
Be aware of stacking fault introduced by partial dislocation.
Understand the dislocation intermediated plastic flow and strengthening.
Understand the mechanism of dislocation multiplication.
Be able to compute interaction force between dislocation, solute atom, precipitate, dispersoid in terms of weak and strong obstacles.
Understand the relation between strain-rate and temperature dependencies of dislocation hardening.

Keywords

lattice defects, dislocation, slip deformation, elasticity, partial dislocation, stacking fault, strengthening mechanisms, thermal activation process of a dislocation motion

Competencies that will be developed

✔ Specialist skills

Intercultural skills

Communication skills

Critical thinking skills

✔ Practical and/or problem-solving skills

Class flow

Attendance is taken in every class.
Towards the end of class, students are given exercise problems related to what is taught on that day to solve.

Course schedule/Required learning

	Course schedule	Required learning
Class 1	Defects in crystalline materials	The homework must be handed in next class.
Class 2	Slip deformation of crystals
Class 3	Description of a dislocation
Class 4	Review of elasticity theory
Class 5	The stress field around a dislocation
Class 6	Forces on a dislocation
Class 7	Achievement evaluation and general practice (1)
Class 8	Dislocations in crystals
Class 9	Partial dislocation and stacking fault
Class 10	Multiplication and cutting of dislocations
Class 11	Plastic deformation of pure metals
Class 12	Various strengthening mechanisms
Class 13	Strengthning by precipitates and solid solute atoms
Class 14	Strain rate and temperature dependence of strength
Class 15	Achievement evaluation and general practice (2)

Textbook(s)

All materials used in class can be found on OCW.

Reference books, course materials, etc.

Masaharu Kato, "Nyumon teniron", Shoukabo. Masaharu Kato, Kazuhiro Nagata, "Toite wakaru zairyo kougaku", Maruzen.

Assessment criteria and methods

Students’ course scores are based on exercise problems and midterm exams (40%) and final exams (60%).

Related courses

MAT.M201 ： Fundamentals of Crystallography
MAT.M205 ： Fundamentals of Stress and Strain, and Deformation of Metals

Prerequisites (i.e., required knowledge, skills, courses, etc.)

No prerequisites are necessary, but enrollment in the related courses is desirable.

TOKYO INSTITUTE OF TECHNOLOGY