Download or read book Dislocation Multiplication in Shock deformed Copper Single Crystals written by Michael Ross Keegan and published by . This book was released on 1967 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dislocation Mechanism Based Crystal Plasticity written by Zhuo Zhuang and published by Academic Press. This book was released on 2019-04-12 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dislocation Based Crystal Plasticity: Theory and Computation at Micron and Submicron Scale provides a comprehensive introduction to the continuum and discreteness dislocation mechanism-based theories and computational methods of crystal plasticity at the micron and submicron scale. Sections cover the fundamental concept of conventional crystal plasticity theory at the macro-scale without size effect, strain gradient crystal plasticity theory based on Taylar law dislocation, mechanism at the mesoscale, phase-field theory of crystal plasticity, computation at the submicron scale, including single crystal plasticity theory, and the discrete-continuous model of crystal plasticity with three-dimensional discrete dislocation dynamics coupling finite element method (DDD-FEM). Three kinds of plastic deformation mechanisms for submicron pillars are systematically presented. Further sections discuss dislocation nucleation and starvation at high strain rate and temperature effect for dislocation annihilation mechanism. - Covers dislocation mechanism-based crystal plasticity theory and computation at the micron and submicron scale - Presents crystal plasticity theory without size effect - Deals with the 3D discrete-continuous (3D DCM) theoretic and computational model of crystal plasticity with 3D discrete dislocation dynamics (3D DDD) coupling finite element method (FEM) - Includes discrete dislocation mechanism-based theory and computation at the submicron scale with single arm source, coating micropillar, lower cyclic loading pillars, and dislocation starvation at the submicron scale

Download or read book Dislocations and Plastic Deformation written by I. Kovács and published by Elsevier. This book was released on 2016-07-08 with total page 359 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dislocations and Plastic Deformation deals with dislocations and plastic deformation, and specifically discusses topics ranging from deformation of single crystals and dislocations in the lattice to the fundamentals of the continuum theory, the properties of point defects in crystals, multiplication of dislocations, and partial dislocations. The effect of lattice defects on the physical properties of metals is also considered. Comprised of nine chapters, this book begins by providing a short and, where possible, precise explanation of dislocation theory. The first six chapters discuss the properties of dislocations and point defects both in crystals and in an elastic continuum. The reader is then introduced to some applications of dislocation theory that show, for instance, the difficulties involved in understanding the hardening of alloys and the work-hardening of pure metals. This book concludes by analyzing the effect of heat treatment on the defect structure in metals. This text will be of interest to students and practitioners in the field of physics.

Download or read book Dislocation Multiplication in the Early Stage of Deformation in Mo Single Crystals written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Initial dislocation structure in annealed high-purity Mo single crystals and deformation substructure in a crystal subjected to 1% compression have been examined and studied using transmission electron microscopy (TEM) techniques in order to investigate dislocation multiplication mechanisms in the early stage of plastic deformation. The initial dislocation density is in a range of 106 (almost equal to) 107 cm−2, and the dislocation structure is found to contain many grown-in superjogs along dislocation lines. The dislocation density increases to a range of 108 (almost equal to) 109 cm−2, and the average jog height is also found to increase after compressing for a total strain of 1%. It is proposed that the preexisting jogged screw dislocations can act as (multiple) dislocation multiplication sources when deformed under quasi-static conditions. The jog height can increase by stress-induced jog coalescence, which takes place via the lateral migration (drift) of superjogs driven by unbalanced line-tension partials acting on link segments of unequal lengths. The coalescence of superjogs results in an increase of both link length and jog height. Applied shear stress begins to push each link segment to precede dislocation multiplication when link length and jog height are greater than critical lengths. This ''dynamic'' dislocation multiplication source is suggested to be crucial for the dislocation multiplication in the early stage of plastic deformation in Mo.

Download or read book The Deformation of Single Crystals of Copper and Alloys of Copper written by Hugh Thomas Hudson and published by . This book was released on 1960 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dislocation Distribution in Deformed Copper Single Crystals written by Z. S. Basinski and published by . This book was released on 1964 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Observations of dislocation distribution in copper single crystals oriented for single glide and deformed at low temperatures are described. In stage I the dislocation population consists mainly of bundles of long edge dislocations belonging to the primary glide system. They are distributed very non-uniformly with dense clumps separated by large areas of perfect material. The dislocations become more tangled with increasing deformation until in stage II they consist mainly of networks lying approximately parallel to the active glide plane and dense clumps of primary edge dislocations. Large differences in distribution are observed in areas near to and far from deformation bands. The results of thin foil observations are compared with data obtained by other methods, e.g., etch pitting and slip lines and their significance are discussed. (Author).

Download or read book Dislocation dipoles in deformed copper single crystals written by J. T. Fourie and published by . This book was released on 1965 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dynamic Dislocation Phenomena in Single Crystals of ga s phase Binary and Ternary Copper Alloys written by Sudipta Kumar Ray and published by . This book was released on 1979 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dislocation Density of Plastically Deformed Copper and Aluminum Single Crystals written by Monroe Jerome Hordon and published by . This book was released on 1960 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Initial Dislocation Structure and Dynamic Dislocation Multiplication in Mo Single Crystals written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Initial dislocation structure in annealed high-purity Mo single crystals and deformation substructure in a crystal subjected to 1% compression have been examined and studied in order to investigate dislocation multiplication mechanisms in the early stages of plastic deformation. The initial dislocation density is in a range of 106 (almost equal to) 107 cm−2, and the dislocation structure is found to contain many grown-in superjogs along dislocation lines. The dislocation density increases to a range of 108 (almost equal to) 109 cm−2, and the average jog height is also found to increase after compressing for a total strain of 1%. It is proposed that the preexisting jogged screw dislocations can act as (multiple) dislocation multiplication sources when deformed under quasi-static conditions. Both the jog height and length of link segment (between jogs) can increase by stress-induced jog coalescence, which takes place via the lateral migration (drift) of superjogs driven by unbalanced line-tension partials acting on link segments of unequal lengths. Applied shear stress begins to push each link segment to precede dislocation multiplication when link length and jog height are greater than critical lengths. This dynamic dislocation multiplication source is subsequently verified by direct simulations of dislocation dynamics under stress to be crucial in the early stages of plastic deformation in Mo single crystals.

Download or read book Chemistry at Extreme Conditions written by M.R. Manaa and published by Elsevier. This book was released on 2005-03-02 with total page 525 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemistry at Extreme Conditions covers those chemical processes that occur in the pressure regime of 0.5–200 GPa and temperature range of 500–5000 K and includes such varied phenomena as comet collisions, synthesis of super-hard materials, detonation and combustion of energetic materials, and organic conversions in the interior of planets. The book provides an insight into this active and exciting field of research. Written by top researchers in the field, the book covers state of the art experimental advances in high-pressure technology, from shock physics to laser-heating techniques to study the nature of the chemical bond in transient processes. The chapters have been conventionally organised into four broad themes of applications: biological and bioinorganic systems; Experimental works on the transformations in small molecular systems; Theoretical methods and computational modeling of shock-compressed materials; and experimental and computational approaches in energetic materials research.* Extremely practical book containing up-to-date research in high-pressure science * Includes chapters on recent advances in computer modelling* Review articles can be used as reference guide

Download or read book Dependence of Flow Stress on Dislocation Substructures in Copper written by William Louis Price and published by . This book was released on 1962 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Deformation Substructure of Copper Single Crystals After Explosive Loading as Disclosed by Electron Optical and X Ray Methods written by V. A. Greenhut and published by . This book was released on 1975 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compressively shock-loaded copper single crystals were examined employing complementary methods of X-ray diffraction, X-ray topography (XRT), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The defect structures induced depended on the crystal orientation relative to the direction of shock propagation and also upon the existence or absence of a reflected tensile wave. TEM disclosed that the defect structure induced by compressive shock loading consisted of clusters of microtwins alternating with a tangled dislocation substructure. Failure zones did not occur. The induced defect structure exhibited a low net macroscopic misorientation which amounted to less than two degrees of arc and the misorientation of the twinned regions with respect to the adjacent dislocation substructure was less than 1/2 degree of arc. By contrast specimens subjected to a reflected tensile pulse exhibited a failure zone and the defect structure in its vicinity showed a substantial macroscopic misorientation. In addition, a high incidence of porosity was observed by SEM. The pores had octahedral shape with facets corresponding to close-packed planes. Structural details observed within the pores were identified as twinned regions. (Author).

Download or read book Shock Wave Phenomena and the Properties of Condensed Matter written by Gennady I. Kanel and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the main goals of investigations of shock-wave phenomena in condensed matter is to develop methods for predicting effects of explosions, high-velocity collisions, and other kinds of intense dynamic loading of materials and structures. Based on the results of international research conducted over the past 30 years, this book is addressed not only to experts in shock-wave physics, but also to interested representatives from adjacent fields of activity and to students who seek an introduction to the current issues.

Download or read book Studies of the Deformation Mechanics of an Impulsively Loaded Copper Single Crystal written by G. Moss and published by . This book was released on 1960 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surface Deformation and Friction on Single Crystals of Copper written by John Martin Bailey and published by . This book was released on 1959 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recovery of Dislocation Structures in Plastically Deformed Copper and Nickel Single Crystals written by F. Prinz and published by . This book was released on 1981 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: