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This book presents the most recent results in the area of bulk nanostructured materials and new trends in their severe plastic deformation (SPD) processing, where these techniques are now emerging from the domain of laboratory-scale research into the commercial production of various bulk nanomaterials.
Preface xiii
Acknowledgments xv
1. Introduction 1
2. Description of Severe Plastic Deformation (SPD): Principles and Techniques 6
2.1. A Historical Retrospective of SPD Processing 6
2.2. Main Techniques for Severe Plastic Deformation 8
2.3. SPD Processing Regimes for Grain Refinement 15
2.4. Types of Nanostructures from SPD 16
PART One High–Pressure Torsion 23
3. Principles and Technical Parameters of High–Pressure Torsion 25
3.1. A History of High–Pressure Deformation 25
3.2. Definition of the Strain Imposed in HPT 28
3.3. Principles of Unconstrained and Constrained HPT 32
3.4. Variation in Homogeneity Across an HPT Disk 33
3.4.1. Developing a Pictorial Representation of the Microhardness Distributions 33
3.4.2. Macroscopic Flow Pattern During HPT 38
3.4.3. Occurrence of Nonhomogeneity in the Microstructures Produced by HPT 52
3.5. Influence of Applied Load and Accumulated Strain on Microstructural Evolution 67
3.6. Influence of Strain Hardening and Dynamic Recovery 71
3.7. Significance of Slippage During High–Pressure Torsioning 76
3.8. Models for the Development of Homogeneity in HPT 81
4. HPT Processing of Metals, Alloys, and Composites 88
4.1. Microstructure Evolution and Grain Refinement in Metals Subjected to HPT 88
4.1.1. Microstructure and Grain Refinement in fcc and bcc Pure Metals 88
4.1.2. Allotropic Transformation in HCP Metals as Mechanism of Grain Refinement 97
4.1.3. Significance of the Minimum Grain Size Attained Using HPT 103
4.1.4. Microtexture and Grain Boundary Statistics in HPT Metals 107
4.2. Processing of Solid Solutions and Multiphase Alloys 112
4.2.1. High–Pressure Torsion of Solid Solutions 112
4.2.2. Grain Refinement During Processing of Multiphase Alloys 119
4.2.3. Amorphization and Nanocrystallization of Alloys by HPT 126
4.3. Processing of Intermetallics by HPT 130
4.4. Processing of Metal Matrix Composites 136
5. New Approaches to HPT Processing 152
5.1. Cyclic Processing by Reversing the Direction of Torsional Straining 152
5.2. Using HPT for the Cold Consolidation of Powders and Machining Chips 173
5.3. Extension of HPT to Large Samples 180
PART TWOE qual Channel Angular Pressing 191
6. Development of Processing Using Equal–Channel Angular Pressing 193
6.1. Construction of an ECAP/ECAE Facility 193
6.2. Equal–Channel Angular Pressing of Rods, Bars, and Plate Samples 195
6.3. Alternative Procedures for Achieving ECAP: Rotary Dies, Side–Extrusion, and Multipass Dies 198
6.4. Developing ECAP with Parallel Channels 201
6.5. Continuous Processing by ECAP: From Continuous Confined Shearing, Equal–Channel Angular Drawing and Conshearing, to Conform Process 204
7. Fundamental Parameters and Experimental Factors in ECAP 215
7.1. Strain Imposed in ECAP 215
7.2. Processing Routes in ECAP 219
7.3. Shearing Patterns Associated with ECAP 221
7.4. Experimental Factors Influencing ECAP 223
7.4.1. Influence of the Channel Angle and the Angle of Curvature 223
7.4.2. Influence of the Pressing Speed and Temperature 229
7.5. Role of Internal Heating During ECAP 232
7.6. Influence of a Back Pressure 234
8. Grain Refinement in Metallic Systems Processed by ECAP 239
8.1. Mesoscopic Characteristics After ECAP 240
8.2. Development of an Ultrafine–Grained Microstructure 244
8.3. Factors Governing the Ultrafine Grain Size in ECAP 253
8.4. Microstructural Features and Texture After ECAP 256
8.5. Influence of ECAP on Precipitation 262
8.6. Pressing of Multiphase Alloys and Composites 266
8.6.1. Multiphase Alloys 267
8.6.2. Metal Matrix Composites 270
8.7. Consolidation by ECAP 275
8.8. Post–ECAP Processing 277
PART THRE Fundamentals and properties of materials after SPD 289
9. Structural Modeling and Physical Properties of SPD–Processed Materials 291
9.1. Experimental Studies of Grain Boundaries in BNM 293
9.2. Developments of Structural Model of BNM 309
9.3. Fundamental Parameters and Physical Properties 312
9.3.1. Curie Temperature and Magnetic Properties 313
9.3.2. Debye Temperature and Diffusivity 315
9.3.3. Electroconductivity 320
9.3.4. Elastic Properties and Internal Friction 323
10. Mechanical Properties of BNM at Ambient Temperature 331
10.1. Strength and "Superstrength" 332
10.2. Plastic Deformation and Ductility 338
10.3. Fatigue Behavior 345
10.4. Alternative Deformation Mechanisms at Very Small Grain Sizes 350
11. Mechanical Properties at High Temperatures 357
11.1. Achieving Superplasticity in Ultrafine–Grained Metals 359
11.1.1. Superplasticity after Processing by HPT 360
11.1.2. Superplasticity after Processing by ECAP 364
11.2. Effects of Different ECAP Processing Routes on Superplasticity 370
11.3. Developing a Superplastic Forming Capability 375
11.4. Cavitation in Superplasticity After SPD 378
11.5. Future Prospects for Superplasticity in Nanostructured Materials 380
12. Functional and Multifunctional Properties of Bulk Nanostructured Materials 387
12.1. Corrosion Behavior 388
12.2. Wear Resistance 390
12.3. Enhanced Strength and Conductivity 393
12.4. Biomedical Behavior of Nanometals 396
12.5. Enhanced Magnetic Properties 398
12.6. Inelasticity and Shape–Memory Effects 402
12.7. Other Functional Properties 405
12.7.1. Enhanced Reaction Kinetics 405
12.7.2. Radiation Resistance 407
12.7.3. Thermoelectric Property 408
PART FOUR Innovation Potential and Prospects for SPD applications 415
13. Innovation Potential of Bulk Nanostructured Materials 417
13.1. Nanotitanium and Ti Alloys for Medical Implants 417
13.2. Nanostructured Mg Alloys for Hydrogen Storage 420
13.3. Micro–Devices from BNM 423
13.4. Innovation Potential and Application of Nanostructured Al Alloys 423
13.5. Fabrication of Nanostructured Steels for Engineering 425
14. Conclusions 434
Index 436
RUSLAN Z. VALIEV, PhD, is Professor and Director of the Institute of Physics of Advanced Materials at Ufa State Aviation Technical University. He is also Head of Laboratory on Mechanics of Bulk Nanomaterials at St. Petersburg State University and Chairman of the International NanoSPD Steering Committee (www.nanospd.org).
ALEXANDER P. ZHILYAEV, PhD, is Principal Research Scientist for the Institute for Metals Superplasticity at the Russian Academy of Sciences. He is also Senior Research Fellow on the Faculty of Engineering and the Environment at the University of Southampton.
TERENCE G. LANGDON, PhD, is Professor of Materials Science at the University of Southampton. He is also the William E. Leonhard Professor of Engineering at the University of Southern California and founding member of the International NanoSPD Steering Committee.
The authors, through their numerous pioneering studies, have played a major role in the development and use of SPD techniques to process bulk nanostructured materials.
Helps readers move from laboratory–scale research to industrial applications
In recent years, the development of bulk nanostructured materials has become one of the most promising research directions in materials science. Bulk nanostructured materials can provide new and unusual properties for a wide range of different metals and alloys, such as very high strength and ductility, record–breaking fatigue endurance, or increased superplastic forming capabilities and many others. With bulk nanostructured materials moving from laboratory–scale research to industrial applications, the full potential of this research area is beginning to emerge.
Bulk Nanostructured Materials sets the stage for further innovation by providing a single treatise that encapsulates the fundamentals as well as new and emerging applications based on severe plastic deformation (SPD) processing. The book presents and analyzes the most recent results in bulk nanostructured materials research as well as new trends in SPD developments. Special emphasis is placed on the mechanical properties, functional behavior, and innovative applications of bulk nanostructured materials formed by severe plastic deformation.
Bulk Nanostructured Materials is divided into five parts:
- Part One: Introduction, Definition and Concept of Bulk Nanomaterials
- Part Two: High Pressure Torsion Processing
- Part Three: Equal–Channel Angular Pressing
- Part Four: Fundamentals and Properties of Materials after SPD
- Part Five: Innovation Potential and Prospects for SPD Applications
Figures throughout the book clarify complex concepts and techniques. In addition, detailed examples help readers bridge the gap from theory to practical applications.
By drawing together the fundamentals and techniques in the field, Bulk Nanostructured Materials makes it possible for students and professionals in nanotechnology and materials research to create new bulk nanostructured materials with a broad range of useful industrial applications.
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