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.
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.
lattice defects, dislocation, slip deformation, elasticity, partial dislocation, stacking fault, strengthening mechanisms, thermal activation process of a dislocation motion
✔ Specialist skills | Intercultural skills | Communication skills | Critical thinking skills | ✔ Practical and/or problem-solving skills |
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 | |
---|---|---|
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 | Learn the Peach-Koehler force |
Class 7 | Achievement evaluation and general practice (1) | Do the exercises on P. 1 to P. 20 in the textbook |
Class 8 | Dislocations in crystals | Do the exercises on P. 27 in the textbook |
Class 9 | Partial dislocation and stacking fault | Do the exercises on P. 27 in the textbook |
Class 10 | Multiplication and cutting of dislocations | Do the exercises on P. 37 in the textbook |
Class 11 | Plastic deformation of pure metals | Do the exercises on P. 37 in the textbook |
Class 12 | Various strengthening mechanisms | Do the exercises on P. 45 in the textbook |
Class 13 | Strengthning by precipitates and solid solute atoms | Do the exercises on P. 45 in the textbook |
Class 14 | Strain rate and temperature dependence of strength | Do the exercises on P. 51 in the textbook |
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.
All materials used in class can be found on OCW.
Masaharu Kato, "Nyumon teniron", Shoukabo. Masaharu Kato, Kazuhiro Nagata, "Toite wakaru zairyo kougaku", Maruzen.
Students’ course scores are based on exercise problems and midterm exams (40%) and final exams (60%).
No prerequisites are necessary, but enrollment in the related courses is desirable.