2025 (Current Year) Faculty Courses School of Materials and Chemical Technology Undergraduate major in Materials Science and Engineering

Lattice Defects and Dislocation

Academic unit or major: Undergraduate major in Materials Science and Engineering
Instructor(s): Toshiyuki Fujii / Xiao-Wen Lei
Class Format: Lecture (Face-to-face)
Media-enhanced courses: -
Day of week/Period (Classrooms): 3-4 Tue / 3-4 Fri
Class: -
Course Code: MAT.M303
Number of credits: 200
Course offered: 2025
Offered quarter: 2Q
Syllabus updated: Mar 19, 2025
Language: Japanese

Syllabus

Course overview and goals

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.

Course description and aims

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

Specialist skills
Intercultural skills
Communication skills
Critical thinking skills
Practical and/or problem-solving skills

Class flow

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

Course schedule/Objectives

	Course schedule	Objectives
Class 1	Defects in crystalline materials	Do the exercises on P. 6 in the textbook
Class 2	Slip deformation of crystals	Do the exercises on P. 17 in the textbook
Class 3	Description of a dislocation	Do the exercises on P. 17 in the textbook
Class 4	Review of elasticity theory	Do the exercises on P. 17 in the textbook
Class 5	The stress field around a dislocation	Do the exercises on P. 20 in the textbook
Class 6	Forces on a dislocation Achievement evaluation and general practice (1)	Learn the Peach-Koehler force Do the exercises on P. 1 to P. 20 in the textbook
Class 7	Dislocations in crystals	Do the exercises on P. 27 in the textbook
Class 8	Partial dislocation and stacking fault	Do the exercises on P. 27 in the textbook
Class 9	Multiplication and cutting of dislocations	Do the exercises on P. 37 in the textbook
Class 10	Plastic deformation of pure metals	Do the exercises on P. 37 in the textbook
Class 11	Various strengthening mechanisms	Do the exercises on P. 45 in the textbook
Class 12	Strengthning by precipitates and solid solute atoms	Do the exercises on P. 45 in the textbook
Class 13	Strain rate and temperature dependence of strength	Do the exercises on P. 51 in the textbook
Class 14	Achievement evaluation and general practice (2)	Do the exercises on P. 27 to P. 51 in the textbook

Study advice (preparation and review)

To enhance effective learning, students are encouraged to spend approximately 100 minutes preparing for class and another 100 minutes reviewing class content afterwards (including assignments) for each class.
They should do so by referring to textbooks and other course material.

Textbook(s)

All materials used in class can be found on T2SCHOLA.

Reference books, course materials, etc.

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

Evaluation methods and criteria

Students’ course scores are based on exercise problems and midterm exams (50%) and final exams (50%).

Related courses

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

Prerequisites

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