Download or read book Dislocation Interaction and the High Temperature Mechanical Properties of MgO Crystals written by Roger Chang and published by . This book was released on 1960 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Mechanical Properties of Magnesium Oxide as a Function of Temperature written by R. B. Day and published by . This book was released on 1965 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Mechanical Behavior of Magnesium Oxide at High Temperatures written by R. B. Day and published by . This book was released on 1964 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnesium oxide crystals show a wide variety of deformation and fracture modes under tension at high temperatures depending on the number of slip systems operating concurrently in a given volume. At low temperatures slip is confined to a single 110 (110) system and plasticity is limited by stress concentrations which develop where slip switches from one plane to another. At intermediate temperatures 110 (110) slip systems at 90 degrees to each other can interpenetrate but those at 60 degrees cannot. At high temperatures dislocations can interpenetrate on all systems and polygonization can occur. After easy glide the crystals work harden and elongate over 100 percent before fracturing in a completely ductile manner. The transition from one mode to another depends on strain rate. The relative ability for 90 or 60 degree systems to intersect is discussed in terms of dislocation interactions. (Author).

Download or read book Thermal mechanical History and the Strength of Magnesium Oxide Single Crystals I Mechanical Tests written by R. J. Stokes and published by . This book was released on 1964 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: Various dislocation impurity interactions in magnesium oxide and their effct on mechanical properties between room temperature and 1000C are discussed. (Author).

Download or read book Temperature Dependence of Plastic Yield Stress in Magnesium Oxide Single Crystals written by J. E. May and published by . This book was released on 1960 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Crystal Dislocations Their Impact on Physical Properties of Crystals written by Peter Lagerlof and published by MDPI. This book was released on 2019-01-09 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Crystal Dislocations: Their Impact on Physical Properties of Crystals" that was published in Crystals

Download or read book Fundamental Aspects of Dislocation Interactions written by G. Kostorz and published by Elsevier. This book was released on 2013-09-03 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamental Aspects of Dislocation Interactions: Low-Energy Dislocation Structures III covers the papers presented at a European Research Conference on Plasticity of Materials-Fundamental Aspects of Dislocation Interactions: Low-Energy Dislocation Structures III, held on August 30-September 4, 1992 in Ascona, Switzerland. The book focuses on the processes, technologies, reactions, transformations, and approaches involved in dislocation interactions. The selection first offers information on work softening and Hall-Petch hardening in extruded mechanically alloyed alloys and dynamic origin of dislocation structures in deformed solids. Discussions focus on stress-strain behavior in relation to composition, structure, and annealing; comparison of stress-strain curves with work softening theory; sweeping and trapping mechanism; and model of dipolar wall structure formation. The text then ponders on plastic instabilities and their relation to fracture and dislocation and kink dynamics in f.c.c. metals studied by mechanical spectroscopy. The book takes a look at misfit dislocation generation mechanisms in heterostructures and evolution of dislocation structure on the interfaces associated with diffusionless phase transitions. Discussions focus on dislocation representation of a wall of elastic domains; equation of equilibrium of an elastic domain; transformation of dislocations; and theoretical and experimental background. The selection is a valuable reference for readers interested in dislocation interactions.

Download or read book Dislocation Sources and the Strength of Magnesium Oxide Single Crystals written by R. J. Stokes and published by . This book was released on 1962 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report compares the room temperature mechanical behavior of MgO crystals containing fresh and grown in dislocation sources. Fresh dislocation sources introduced by cleavage or mechanical contact move and multiply to generate slip bands at 3000 psi. Macroscopically the crystals yield smoothly at 6000 psi and can be quite ductile. When fresh sources are eliminated by chemical polishing the crystals have to rely on grown in sources to initiate slip. They then deform elastically up to extremely high stresses, about 30,000 to 50,000 psi, yielding with a sharp yield drop down to the stress level at which fresh sources operate. Grown in sources are considered to be associated with impurity precipitate particles or inclusions. Annealing polished crystals at 2000 C dissolves these particles thereby eliminating sources for slip. The crystals then become greater than 70,000 psi and approach within 1/10 of the theoretical strength. (Author).

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 1166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnesia Alumina Beryllia Ceramics Fabrication Characterization and Properties written by Allen Alper and published by Elsevier. This book was released on 2012-12-02 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: High Temperature Oxides, Magnesia, Alumina, Beryllia Ceramics: Fabrication, Characterization and Properties is the third part of a series of four books on high temperature oxides. This text is divided into five chapters that deal with the research and technical advances in selected refractory oxides, such as magnesia, alumina, and beryllium oxide. Chapter 1 discusses the preparation, characterization, thermal and mechanical properties, and application to the electrical and electronic fields of beryllium oxide. Chapter 2 examines the mechanical behavior of single crystals of magnesia, including its dislocation motion and interactions, and crack nucleation and growth. Chapter 3 describes the significance of diffusive and mechanical properties of sintered alumina and magnesia. Chapter 4 deals with the process mechanisms, control, and limitations of hot-pressing, with particular emphasis on the practical applications of hot-pressed refractory oxides. Chapter 5 explores the possible benefits of hot-working, operational processes involved in such working, and the applications of fabricated oxides. This book is of great value to engineers, materials scientists, and students with advanced materials science courses.

Download or read book Research in Progress written by and published by . This book was released on 1964 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Battelle Technical Review written by Battelle Memorial Institute and published by . This book was released on 1961 with total page 830 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1976 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: