2/15/2002, Friday Strengthening Mechanisms. Strengthening Philosophy Plastic deformation is due to the motion of a large number of dislocations; Strength.

Slides:

Advertisements

Similar presentations

MatSE 259 Exam 1 Review Session 1.Exam structure – 25 questions, 1 mark each 2.Do NOT forget to write your student I.D. on the answer sheet 3.Exams are.

Advertisements

LECTURER5 Fracture Brittle Fracture Ductile Fracture Fatigue Fracture

High Temperature Deformation of Crystalline Materials Dr. Richard Chung Department of Chemical and Materials Engineering San Jose State University.

Grain Boundaries Ni-Base Superalloy Waspalloy 50µm high-angle grain boundary (  >15°) low-angle grain boundary.

Deformation & Strengthening Mechanisms of Materials

Dislocations Today's objective – how to make these guys work harder Today's objective – how to make these guys work harder.

Dislocations & Strengthening (1)

Plasticity, Ductility 4/15/2017 4/15/2017 1

Nanostructured Metallic Materials Processing and Mechanical Properties Sung Whang.

ASE324: Aerospace Materials Laboratory Instructor: Rui Huang Dept of Aerospace Engineering and Engineering Mechanics The University of Texas at Austin.

Deformation and Strengthening Mechanisms

PY3090 Preparation of Materials Lecture 3 Colm Stephens School of Physics.

Dislocations and Strengthening

Materials Engineering – Day 6

The Structure of Metals

Mechanical & Aerospace Engineering West Virginia University Work Hardening and Annealing.

Solidification and Heat Treatment

Grain boundary strengthening (Hall-Petch strengthening)

Discussion Notes Farzana Ansari Feb 14 & 16, 2012.

Dislocations & Strengthening Mechanisms

Solid Solution Strengthening

Lecture 3.0 Structural Defects Mechanical Properties of Solids.

Cold Working is Actually Strain Hardening Basic equation relating flow stress (strain hardening) to structure is:  o =  i +  Gb  1/2 Yield stress increases.

Introduction to Materials Science, Chapter 7, Dislocations and strengthening mechanisms University of Virginia, Dept. of Materials Science and Engineering.

Materials Moments: Arthur C—Food Containers Lewis & Ray—Al Composites.

Lecture 22: The mechanism of plastic deformation, part 2

© GNU Su-Jin Kim Deformation & Strengthening Material Science Deformation & Strengthening 변형 경화.

Dislocation And Strengthening Mechanisms Plastic deformation through dislocation: Slip Ideal shear stress d a   ~ G d/a ~ 10 6 psi (calc.) ~ 10~10 3.

Chapter 8 Strain hardening and annealing

Deformation and Strengthening Mechanisms of Materials

YouTube: SEM study of slip in deformed cadmium single crystalSEM study of slip in deformed cadmium single crystal Reduced Strength due to Dislocations:

PLASTIC DEFORMATION Dislocations and their role in plastic deformation.

CHAPTER 8: DEFORMATION AND STRENGTHENING MECHANISMS

CHAPTER 10 Mechanical Properties： Dislocations and Plastic Deformation

Precipitation or Age Hardening

ME 330 Engineering Materials

ENGR-45_Lec-18_DisLoc-Strength-2.ppt 1 Bruce Mayer, PE Engineering-45: Materials of Engineering Bruce Mayer, PE Registered Electrical.

Lecture 7 Review of Difficult Topics MATLS 4L04: Aluminum Section.

YouTube: SEM study of slip in deformed cadmium single crystal

Ductile Deformation Processes Chapter 9 in Van der Pluijm and Marshak.

Plastic deformation Extension of solid under stress becomes

MatSE 259 Exam 1 Review Session 1.Exam structure – 25 questions, 1 mark each 2.Do NOT forget to write your student I.D. on the answer sheet 3.Exams are.

Materials Science Metals and alloys.

Chapter 7: Dislocations and Strengthening Mechanisms in Metal

When you ask a question, do you really want to know the answer, or are you merely flaunting your power? -Dmitri Harkonnen When you ask a question, do you.

Dislocation Interactions

Yield strength: the elongation of a mat'l

Plastic Deformation of Polycrystalline Metals

CHAPTER 5 : DISLOCATION & METAL STRENGTHENING MECHANISMS

Sal College of Engineering

Materials Engineering

CRITICAL RESOLVED SHEAR STRESS

Mechanical Properties of Metals

Dislocations and Strengthening

Engineering materials lecture #12

Freedom is an elusive concept

Steel and martensitic transformation

Ductility and strengthening in crystalline solids

Structural Defects Mechanical Properties of Solids

Mechanical & Aerospace Engineering West Virginia University Work Hardening and Annealing.

Strain Hardening & Annealing

Description & importance

Structural Defects Mechanical Properties of Solids

All strengthening techniques are based on the simple principle:

Fundamental concepts of metals science

CREEP CREEP Dr. Mohammed Abdulrazzaq Materials Engineering Department.

CRYSTAL IMPERFECTIONS

Grains in Metals.

PLASTIC DEFORMATION & DISLOCATIONS

CHE 333 Class 18 Fracture of Materials.

Presentation transcript:

2/15/2002, Friday Strengthening Mechanisms

Strengthening Philosophy Plastic deformation is due to the motion of a large number of dislocations; Strength (resistance to deformation) can be improved by putting obstacles to slip

Polycrystalline metals vs. single crystals, which one is stronger?

Dislocation in polycrystalline

Strengthening by grain size reduction The finer the grains, the larger the area of grain boundaries that impedes dislocation motion.

Grain growth

Strain-hardening Ductile metals become stronger when they are deformed plastically.

Dislocation stress fields

Dislocation - dislocation interaction

Chinese ancient sword Chinese Han Dynasty, Bronze Sword, 206BC

Japanese ancient sword Samurai

Solid Solution Strengthening

Precipitation Hardening