Contribution à l'étude des mécanismes de déformation à hautes températures du carbure de titane polycristallin PDF Download

Author: Gilles Leclerc
Publisher:
ISBN:
Category :
Languages : fr
Pages : 92

View

Book Description

Author: MARIE-LAURE.. DUVAL-RIVIERE
Publisher:
ISBN:
Category :
Languages : fr
Pages : 120

View

Book Description
UNE ETUDE MICROSTRUCTURALE DES MECANISMES DE DEFORMATION A HAUTE TEMPERATURE DU CARBURE DE SILICIUM POLYCRISTALLIN ALPHA A ETE REALISEE EN MICROSCOPIE ELECTRONIQUE EN TRANSMISSION. DEUX NUANCES A TENEUR D'AJOUT A BASE D'ALUMINIUM DE 0,3 ET 1,5% PDS ONT ETE ETUDIEES APRES COMPRESSION A 1900-1950C. LES MODIFICATIONS MORPHOLOGIQUES DES CRISTAUX DE SIC APRES COMPRESSION ONT ETE ETUDIEES AU MOYEN DE L'ANALYSE D'IMAGES. CES MODIFICATIONS MORPHOLOGIQUES S'ACCOMPAGNENT OU NON DE TEXTURE CRISTALLOGRAPHIQUE. LES OBSERVATIONS EN MICROSCOPIE ELECTRONIQUE EN TRANSMISSION ONT CONFIRME L'ACTIVATION FREQUENTE DU SYSTEME DE GLISSEMENT BASAL. LE GLISSEMENT DES SYSTEMES PYRAMIDAUX ET PRISMATIQUES ONT ETE TROUVES COMME SYSTEMES DE GLISSEMENT SECONDAIRES LORSQUE LE GLISSEMENT BASAL N'EST PAS FAVORISE. DES TRANSFORMATIONS POLYTYPIQUES ONT PU ETRE MISES EN EVIDENCE TELLES QUE 4H3C, 6H3C ET 4H12R. LE MECANISME DE CETTE DERNIERE TRANSFORMATION EST BASE SUR LE MOUVEMENT DES DISLOCATIONS ET INTERPRETE A L'AIDE D'UN MECANISME DE POLE. CES TRANSFORMATIONS POLYTYPIQUES NE PEUVENT SE REALISER QUE SI LES MOBILITES DES DEUX DISLOCATIONS PARTIELLES SONT TRES DIFFERENTES. ENFIN, DES MECANISMES DE DEFORMATION ONT PU ETRE PROPOSES POUR LES DEUX NUANCES. POUR LA NUANCE 0,3A, LA DEFORMATION A LIEU PAR LE MOUVEMENT DES DISLOCATIONS ET LE CONTROLE SE FAIT PAR UN MECANISME DE DIFFUSION. LA NUANCE 1,5A, DE GRANULOMETRIE DEUX FOIS PLUS PETITE, SE COMPORTE DE FACON SUPERPLASTIQUE. LA DEFORMATION SE FAIT PAR LE GLISSEMENT AUX JOINTS DE GRAINS ET EST CONTROLEE PAR LA DIFFUSION AUX JOINTS DE GRAINS

Author: J.L. Chermant
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0

View

Book Description

Author: Jacques Charrier
Publisher:
ISBN:
Category :
Languages : fr
Pages : 124

View

Book Description

Author: Zay Jeffries
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

View

Book Description

Author: Maciej Motyka
Publisher: BoD – Books on Demand
ISBN: 183962552X
Category : Technology & Engineering
Languages : en
Pages : 156

View

Book Description
Titanium alloys, due to unique physical and chemical properties (mainly high relative strength combined with very good corrosion resistance), are considered as an important structural metallic material used in hi-tech industries (e.g. aerospace, space technology). This book provides information on new manufacturing and processing methods of single- and two-phase titanium alloys. The eight chapters of this book are distributed over four sections. The first section (Introduction) indicates the main factors determining application areas of titanium and its alloys. The second section (Manufacturing, two chapters) concerns modern production methods for titanium and its alloys. The third section (Thermomechanical and surface treatment, three chapters) covers problems of thermomechanical processing and surface treatment used for single- and two-phase titanium alloys. The fourth section (Machining, two chapters) describes the recent results of high speed machining of Ti-6Al-4V alloy and the possibility of application of sustainable machining for titanium alloys.

Author: Redouane Zitoune
Publisher: Trans Tech Publications Ltd
ISBN: 3038261114
Category : Technology & Engineering
Languages : en
Pages : 182

View

Book Description
Special topic volume with invited peer reviewed papers only

Author: Agnes Buka
Publisher: World Scientific
ISBN: 1848167997
Category : Science
Languages : en
Pages : 299

View

Book Description
The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.

Author: Kaiser Engineers
Publisher:
ISBN:
Category : Nuclear power plants
Languages : en
Pages : 140

View

Book Description

Author: Ajay Kumar Mishra
Publisher: Nova Science Publishers
ISBN: 9781620819180
Category : Science
Languages : en
Pages : 0

View

Book Description
The discovery of carbon nanotubes has opened new windows for numerous applications in many disciplines of nanoscience and nanotechnology. Carbon nanotubes consist of graphene sheets in the form of sp2 hybridized carbon atoms. These materials have gained the interest of researchers from various disciplines due to their fascinating physico-chemical properties. This book describes the applications of carbon nanotubes in various areas including environmental science such as remediation and speciation, water research, medicine including sensors, targeted drug delivery and therapeutics. The application of carbon nanotubes in waste water research which includes organic, inorganic and microbial pollutants is also discussed as is its applications in material science and polymer science.