The Martensitic Transformation In Ceramics Its Role In Transformation Toughening
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The Martensitic Transformation In Ceramics Its Role In Transformation Toughening
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Author : Patrick M. Kelly
language : en
Publisher:
Release Date : 2002
The Martensitic Transformation In Ceramics Its Role In Transformation Toughening written by Patrick M. Kelly and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Ceramic materials categories.
Transformation Toughening Of Ceramics
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Author : David J. Green
language : en
Publisher: CRC Press
Release Date : 2018-02-06
Transformation Toughening Of Ceramics written by David J. Green and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-02-06 with Technology & Engineering categories.
The aim of this book is to provide a coherent and up-to-date discussion of the scientific work concerning the transformation toughening of ceramics. We hope the book is useful to scientists, engineers and students who are new to these materials. It is intended both as a source of learning and information to those who are new to these materials. It is intended both as a source of learning behaviour and microstructural relationships in transformation-toughened ceramics. While it has been our aim to present a book that is current as possible at the time of publication, the subject is still expanding in many areas; so our hope is that the reader will also gain an insight into the direction of future advances.
Mechanics Of Transformation Toughening And Related Topics
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Author : J.H. Andreasen
language : en
Publisher: Elsevier
Release Date : 1996-05-01
Mechanics Of Transformation Toughening And Related Topics written by J.H. Andreasen and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996-05-01 with Technology & Engineering categories.
Since the benefit of stress-induced tetragonal to monoclinic phase transformation of confined tetragonal zirconia particles was first recognized in 1975, the phenomenon has been widely studied and exploited in the development of a new class of materials known as transformation toughened ceramics (TTC). In all materials belonging to this class, the microstructure is so controlled that the tetragonal to monoclinic transformation is induced as a result of a high applied stress field rather than as a result of cooling the material below the martensitic start temperature. The significance of microstructure to the enhancement of thermomechanical properties of TTC is now well understood, as are the mechanisms that contribute beneficially to their fracture toughness. The micromechanics of these mechanisms have been extensively studied and are therefore presented here in a cogent manner. The authors also review dislocation formalism for the modelling of cracks and Eshelby's technique. In compiling this monograph the authors present the most up-to-date and complete review of the field and include several topics which have only recently been fully investigated.
Transformation Toughening Of Composite Ceramics
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Author :
language : en
Publisher:
Release Date : 1990
Transformation Toughening Of Composite Ceramics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
Research is underway into the application of martensitic transformations in ceramics to toughen a variety of ceramic-ceramic composites, i.e., to reduce their brittleness. The toughening agents of interest and their volume changes are dicalcium silicate (Ca2SiO4, 12%), nickel sulfide (NiS, 4%), lanthanide sesquioxides (Ln2O3, 8%) and lutentium borate (LuBO3, 8%). Ceramic processing routes have been developed to fabricate different types of toughened composites, viz., either by using a dispersed second phase microstructure or as a fine grained, single phase material. Specifically, Ca2SiO4 has been dispersed in CaZrO3 and the mechanical properties measured by bend tests. The critical importance of matrix toughness and grain size, as well as role of intergranular microcracking has been established. Dense pellets of fine grained, pure beta- Ca2SiO4 have been sintered and their transformability by grinding established. Their microstructures were examined by TEM and preliminary micromechanical studies made on it, and on Gd2O3, by indentation and SEM techniques. NiS inclusions in glass were examined by TEM and EDS and a sol gel processing route to precipitate NiS in glass has been identified. Composites of Dy2O3 in SiC and powders of LuBO3 in B2O3 have been fabricated.
Transformation Toughening Of Ceramics
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Author :
language : en
Publisher:
Release Date : 1995
Transformation Toughening Of Ceramics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.
This report summarizes the results from a 3-year research program aimed at developing a basic understanding of the microstructural design, fabrication, and properties of multilayered zirconia-based composites with high toughness and oxidation resistance. Most of the effort focused on multilayered composites of Ce-ZrO2 and Al2O3 which have strongly bonded interfaces. The design of the layered composite microstructure was based on micromechanics analysis: the layers modify the shape and extent of a crack tip transformation zone, leading to toughnesses over 20 MPa.m1/2. Optimum layer thicknesses were determined and related to effects of autocatalytic transformation and crack tip advance mechanisms. Crack resistance curves were measured at various temperatures: the very high toughnesses (> 10 MPa.m1/2) were limited to temperature range of approx. 100 deg C above the Ms temperature for the martensitic transformation. A preliminary study of multilayered composites containing weakly bonded layers (which achieve toughening by debonding) indicated that rare earth phosphates (LaPO4 and CePO4) are potentially suitable layers for Y- and Ce-stabilized zirconia composites. jg.
The Shearing Contribution In Transformation Toughening Of Brittle Materials
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Author : P. Sofronis
language : en
Publisher:
Release Date : 1985
The Shearing Contribution In Transformation Toughening Of Brittle Materials written by P. Sofronis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
A simple constitutive law is proposed for the description of a ceramic composite which undergoes stress induced martensitic transformation. This law is used in finite element calculations to investigate the shear effect on the transformation zone near a crack tip. A formula describing the stress intensity factor change due to the shear contribution of the transformation is given. Significant loss of toughness is observed in the case of a stationary crack and is attributed entirely to the shear component of the transformation is given. Significant loss of toughness is observed in the case of a stationary crack and is attributed entirely to the shear component of the transformation. As the crack grows, the wake of the transformed material left behind the crack constitutes a source of toughening. This toughening is due to both dilatancy and shear in the phase change and rises to a maximum level just after a propagation comparable with the zone height. Finally, it is shown that the shear component can be important when prediction of the fracture toughness of the transformation toughened ceramics are made.
Transformation Toughening Of Ceramics
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Author : David J. Green
language : en
Publisher: CRC Press
Release Date : 2018-02-06
Transformation Toughening Of Ceramics written by David J. Green and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-02-06 with Technology & Engineering categories.
The aim of this book is to provide a coherent and up-to-date discussion of the scientific work concerning the transformation toughening of ceramics. We hope the book is useful to scientists, engineers and students who are new to these materials. It is intended both as a source of learning and information to those who are new to these materials. It is intended both as a source of learning behaviour and microstructural relationships in transformation-toughened ceramics. While it has been our aim to present a book that is current as possible at the time of publication, the subject is still expanding in many areas; so our hope is that the reader will also gain an insight into the direction of future advances.
Bioceramics And Their Clinical Applications
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Author : Tadashi Kokubo
language : en
Publisher: Elsevier
Release Date : 2008-03-25
Bioceramics And Their Clinical Applications written by Tadashi Kokubo and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-03-25 with Science categories.
Bioceramics have been used very successfully within the human body for many years. They are commonly used in orthopaedic surgery and dentistry but they are potentially suitable for a wide range of important applications within the medical device industry. This important book reviews the range of bioceramics, their properties and range of clinical uses.Chapters in the first section of the book discusses issues of significance to a range of bioceramics such as their structure, mechanical properties and biological interactions. The second part reviews the fabrication, microstructure and properties of specific bioceramics and glasses, concentrating on the most promising materials. These include alumina and zirconia ceramics, bioactive glasses and bioactive glass-ceramics, calcium sulphate, tricalcium phosphate-based ceramics, hydroxyapatite, tricalcium phosphate/hydroxyapatite biphasic ceramics, si-substrated hydroxyapatite, calcium phosphate cement, calcium phosphate coating, titania-based materials, ceramic-polymer composites, dental ceramics and dental glass-ceramics. The final group of chapters reviews the clinical applications of bioceramics in joint replacement, bone grafts, tissue engineering and dentistry.Bioceramics and their clinical applications is written by leading academics from around the world and it provides an authoritative review of this highly active area of research. This book is a useful resource for biomaterials scientists and engineers, as well as for clinicians and the academic community. Provides an authoritative review of this highly active area of research Discusses issues of significance of a range of bioceramics such as their structure, mechanical properties and biological interactions Reviews the clinical applications of bioceramics in joint replacement, bone grafts, tissue engineering and dentistry
The Mechanics Of Internal Stress And Microcrack Toughening Mechanisms In Ceramics
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Author : R. M. McMeeking
language : en
Publisher:
Release Date : 1985
The Mechanics Of Internal Stress And Microcrack Toughening Mechanisms In Ceramics written by R. M. McMeeking and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
A simple constitive law is proposed for the description of a certain ceramic composite which undergoes stress induced martensitic transformation. This law is used in finite element calculations to investigate the shear effect on the transformation zone near a crack tip. A formula describing the stress intensity factor change due to the shear contribution of the transformation given. Significant loss of toughness is observed in the case of a stationary crack and is attributed entirely to the shear component of the transformation. On the contrary, the dilatant part brings about no change. As the crack grows, the wake of the transformed material left behind the crack constitutes a source of toughening. This toughening is due to both dilatancy and shear in the phase change and rises to a maximum level just after a propagation comparable with the zone height. Finally, it is shown that the shear component can be important when prediction of the fracture toughness of the transformation toughened ceramics are made.
Crystallography And Crystal Defects
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Author : Anthony Kelly
language : en
Publisher: John Wiley & Sons
Release Date : 2012-01-25
Crystallography And Crystal Defects written by Anthony Kelly and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-01-25 with Science categories.
Extensively revised and updated, this new edition of a classic text presents a unified approach to crystallography and to the defects found within crystals. The book combines the classical and exact description of symmetry of a perfect crystal with the possible geometries of the major defects-dislocations, stacking faults, point defects, twins, interfaces and the effects of martensitic transformations. A number of important concepts and exciting new topics have been introduced in this second edition, including piezoelectricity, liquid crystals, nanocrystalline concepts, incommensurate materials and the structure of foamed and amorphous solids. The coverage of quasicrystalline materials has been extended, and the data tables, appendices and references have been fully updated. Reinforcing its unrivalled position as the core text for teaching crystallography and crystal defects, each chapter includes problem sets with brief numerical solutions at the end of the book. Detailed worked solutions, supplementary lecture material and computer programs for crystallographic calculations are provided online (http://booksupport.wiley.com).