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2021　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(I124)  Fri3-4(I124)  
Group
-
Course number
MAT.M303
Credits
2
Academic year
2021
Offered quarter
2Q
Syllabus updated
2021/4/9
Lecture notes updated
-
Language used
Japanese
Access Index

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 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

Out-of-Class Study Time (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.

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.

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