Plasticity of Crystals in a Microscopic Viewpoint on the Basis of Dislocation Motion

Description

Here, plasticity of crystals in a microscopic viewpoint, especially on the basis of dislocation (linear defects in crystal) motion, is detailed from the data obtained mainly by the strain-rate cycling tests associated with ultrasonic oscillation for several kinds of alkali-halide single crystals at low temperatures. PLASTICITY OF CRYSTALS IN A MICROSCOPIC VIEWPOINT ON THE BASIS OF DISLOCATION MOTION PLASTICITY OF CRYSTALS IN A MICROSCOPIC VIEWPOINT ON THE BASIS OF DISLOCATION MOTION Library of Congress Cataloging-in-Publication Data CONTENTS PREFACE Chapter 1 PROCESS FOR THERMAL ACTIVATED OVERCOMING OF THE SHORT-RANGE OBSTACLE BY A DISLOCATION 1.1. HARDENING OF ALKALI HALIDE CRYSTALS DUE TO THE DIFFERENT TYPES OF ATOMIC DEFECTS 1.2. COMMON TYPE OF THERMAL ACTIVATION BARRIER FOR A DISLOCATION MOTION REFERENCES Chapter 2 STRAIN-RATE CYCLING TESTS ASSOCIATED WITH ULTRASONIC OSCILLATION 2.1. INTRODUCTION 2.2. EXPERIMENTAL PROCEDURE 2.3. PREPARATION OF SPECIMENS 2.4.  '/LN VERSUS  FOR VARIOUS SPECIMENS 2.5.  P1 AND  P2 VERSUS TEMPERATURE FOR KCL:SR SINGLE CRYSTALS 2.6.  P1 AND  P2 VERSUS YIELD STRESS FOR KCL:SR SINGLE CRYSTALS 2.7. DISCUSSION FOR THE RELATION BETWEEN THE STRAIN-RATE SENSITIVITY AND THE STRESS DECREMENT FOR KCL:SR SINGLE CRYSTALS 2+p1 CONCLUSION REFERENCES Chapter 3 INFLUENCE OF STATE OF IMPURITIES ON THE EFFECTIVE STRESS DUE TO THE IMPURITIES 3.1. INTRODUCTION 3.2. RELATION BETWEEN THE STRAIN-RATE SENSITIVITY AND THE STRESS DECREMENT FOR THE TWO KINDS OF SPECIMENS 3.3. DEPENDENCE OF THE STATE OF IMPURITIES FOR KCL:SRHEAT TREATMENT 2+ ON 3.4. EFFECTIVE STRESS AND CRITICAL TEMPERATURE CONCLUSION REFERENCES Chapter 4 EFFECTIVE STRESS AND CRITICAL TEMPERATURE OF KCL DOPED WITH VARIOUS DIVALENT CATIONS 4.1. INTRODUCTION 4.2. RELATION BETWEEN THE TEMPERATURE AND  YIELD STRESS  Y P1,  P2, AND 4.3. CRITICAL TEMPERATURE 4.4. RELATION BETWEEN THE STRAIN-RATE SENSITIVITY AND THE STRESS DECREMENT 4.5. ACTIVATION ENERGY FOR THE INTERACTION BETWEEN A DISLOCATION AND THE DIVALENT IMPURITY CONCLUSION REFERENCES Chapter 5 THE FRIEDEL RELATION AND THERMALLY ACTIVATED FLOW PARAMETERS OF KCL DOPED WITH VARIOUS DIVALENT CATIONS 5.1. INTRODUCTION 5.2. RELATION BETWEEN (L0/L)2 AND Φ0 5.3. RELATION BETWEEN EFFECTIVE SHEARSTRESS AND TEMPERATURE 5.4. BENDING ANGLE OF A DISLOCATION PINNED BY THE IMPURITY 5.5. DEPENDENCE OF THE STRAIN-RATE SENSITIVITY DUE TO THE IMPURITIES ON THE TEMPERATURE 5.6. THE ENTHALPY AND THE GIBBS FREE ENERGY OF ACTIVATION FOR THE BREAK-AWAY OF A DISLOCATION FROM THE VARIOUS DIVALENT IMPURITIE CONCLUSION REFERENCES Chapter 6 APPLICABILITY OF THE FRIEDEL RELATION TO THEINTERACTION BETWEEN A DISLOCATION AND THE IMPURITY IN KCL:MG2+ SINGLE CR 6.1. INTRODUCTION 6.2. RELATION BETWEEN EFFECTIVE SHEAR STRESS AND TEMPERATURE 6.3. DEPENDENCE OF THE STRAIN-RATE SENSITIVITY DUE TO THEIMPURITIES ON THE TEMPERATURE 6.4. RELATION BETWEEN THE EFFECTIVE SHEAR STRESS AND THEACTIVATION VOLUME FOR THE OVERCOMING OF THE IMPURITIES BY A DISLOCATION 6.5. CONSIDERATION WITH ⅿ 6.6. RELATION BETWEEN TEMPERATURE AND THE ACTIVATION ENTHALPY FOR THE OVERCOMING OF THE IMPURITIES BY A DISLOCATION 6.7. CONSIDERATION WITH  P1(LN/ ')P  6.8. GIBBS FREE ENERGY FOR OVERCOMING OF TETRAGONAL LATTICE DISTORTIONS BY A DISLOCATION CONCLUSION REFERENCES Chapter 7 INFLUENCE OF STATE OF IMPURITIES ON THE DEFORMATION CHARACTERISTICS 7.1. INTRODUCTION 7.2. DISCUSSION FOR THE FORCE-DISTANCE RELATION BETWEEN A DISLOCATION AND THE AGGREGATE 7.2.1. Relationship of P1 and Temperature 7.2.2. Relative Curve of Temperature and the Strain-Rate Sensitivity due to Aggregates 7.2.3. Dislocation Velocity-Effective Stress Exponent 7.2.3.1. Quenched Specimen 7.2.3.2. Annealed Specimen 7.2.4. F0, L /L0, and Φ0 7.2.5. Influence of Heat Treatment on m* 7.2.5.1. m* Obtained on the Basis of mε=0 7.2.5.2. m* Obtained on the Basis of the Relation between Strain-Rate Sensitivity and  7.2.6. Proportionality of H(T) 7.3. THE GIBBS FREE ENERGY FOR OVERCOMING OF THEAGGREGATE BY A DISLOCATION 7.4. INFLUENCE OF THE STATE OF IMPURITIES DUE TO THE HEAT TREATMENT ON THE ACTIVATION ENERGY FOR BREAKAWAY FROM THE IMPURITY BY A DISLOCATION 7.4.1. Activation Enthalpy for the Dislocation Motion 7.4.2. Gibbs Free Energy for the Dislocation Motion CONCLUSION REFERENCES Chapter 8 EFFECTIVE STRESS AND CRITICAL TEMPERATURE OF KCL DOPED WITH MONOVALENT CATIONS 8.1. INTRODUCTION 8.2. RELATION BETWEEN THE STRAIN-RATE SENSITIVITY AND THE STRESS DECREMENT 8.3 INFLUENCE OF TEMPERATURE ON THE STRAIN-RATE SENSITIVITY VERSUS STRESS DECREMENT CURVE 8.4. DEPENDENCE OF P1, P2, AND Y ON THE TEMPERATURE 8.5. INTERPRETATION OF STRAIN-RATE SENSITIVITY VERSUS STRESS DECREMENT CURVE 8.6. RELATION BETWEEN THE EFFECTIVE STRESS DUE TOIMPURITIES AND TEMPERATURE 8.7. DEPENDENCE OF THE STRAIN-RATE SENSITIVITY DUE TO THE IMPURITIES ON THE TEMPERATURE 8.8. RELATION BETWEEN TEMPERATURE AND THE ACTIVATIONENTHALPY FOR THE INTERACTION BETWEEN A DISLOCATION AND THE IMPURITY 8.9. GIBBS FREE ENERGY FOR THE BREAKAWAY OF A DISLOCATION FROM THE IMPURITY CONCLUSION REFERENCES Chapter 9 BENDING ANGLE AT WHICH THE DISLOCATION BREAKS AWAY FROM THE OBSTACLE IN KCL DOPED WITH VARIOUS MONOVALENT IMPURITIES 9.1. INTRODUCTION 9.2. THEORETICAL CONCEPT 9.3. BENDING ANGLE CONCLUSION REFERENCES Chapter 10 INFLUENCE OF A STRAIN ON THE INTERACTION BETWEEN A DISLOCATION AND THE IMPURITIES 10.1. INTRODUCTION 10.2. INFLUENCE OF STRAIN ON THE STRAIN-RATE SENSITIVITY VERSUS STRESS DECREMENT CURVE 10.2.1. Relation between the Strain-Rate Sensitivity and the Stress Decrement 10.2.2. Dependence of P1 and P2p on the Shear Strain 10.3. CRITICAL TEMPERATURE AND THE EFFECTIVE STRESS 10.4. STRAIN-RATE SENSITIVITY AT THE SECOND PLATEAU PLACE ON THE STRAIN-RATE SENSITIVITY VERSUS STRESS DECREMENT CURVE CONCLUSION REFERENCES Chapter 11 INFLUENCE OF THE DIVALENT IMPURITIES ON DISLOCATION DENSITY OF KCL DOPED WITH VARIOUS DIVALENT IMPURITIES 11.1. INTRODUCTION 11.2. INFLUENCE OF THE DIVALENT IMPURITIES ON THE FOREST DISLOCATION DENSITY 11.2.1. Influence of the Divalent Impurities on the Forest Dislocation Density in Different Plastic Deformation Regions of Stress versus Strain Curve 11.2.2. Influence of the Concentration of Divalent Impurities on the Forest Dislocation Density 11.2.3. Influence of the Size of Divalent Impurity on the Forest Dislocation Density 11.3. INFLUENCE OF THE DIVALENT IMPURITIES ON MOBILE DISLOCATION DENSITY CONCLUSION REFERENCES Chapter 12 INFLUENCE OF THE HEAT TREATMENT ON DEFORMATION CHARACTERISTICS 12.1. INTRODUCTION 12.2. INFLUENCE OF THE HEAT TREATMENT ON MOVING DISLOCATION DENSITY 12.3. STRAIN-RATE SENSITIVITY AT SECOND PLATEAU PLACE ON THE RELATIVE CURVE OF STRAIN-RATE SENSITIVITY AND STRESS DECREMENT CONCLUSION REFERENCES INDEX