Characterization of the Microstructure of Fine Energetic Materials

Characterization of the Microstructure of Fine Energetic Materials
Author:
Publisher:
Total Pages: 21
Release: 2003
Genre:
ISBN:

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This report results from a contract tasking Fraunhofer Institut fur Chemische Technologie as follows: Lattice defects in energetic materials will be measured using X-ray diffraction. The method shall be tested for its ability to characterize lattice defects in RDX and HMX, where dislocations gliding and deformation twinning are believed to dominate mechanical behavior. X-ray diffraction patterns will be evaluated relating to phase, residual strain, crystallite size and micro strain. The occurring phases and the lattice parameters of the samples will be determined by Rietveld-method using literature data. Micro strain and crystallite size will be determined with the Williamson Hall method by plotting reciprocal peak widths versus reciprocal lattice distances. New routines for size/strain evaluation, implemented in Rietveld programs will be tested and compared with the Williamson Hall method.

Energetic Materials

Energetic Materials
Author: Ulrich Teipel
Publisher: John Wiley & Sons
Total Pages: 643
Release: 2006-03-06
Genre: Science
ISBN: 3527604936

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Incorporation of particular components with specialized properties allows one to tailor the end product's properties. For instance, the sensitivity, burning behavior, thermal or mechanical properties or stability of energetic materials can be affected and even controllably varied through incorporation of such ingredients. This book examines particle technologies as applied to energetic materials such as propellants and explosives, thus filling a void in the literature on this subject. Following an introduction covering general features of energetic materials, the first section of this book describes methods of manufacturing particulate energetic materials, including size reduction, crystallization, atomization, particle formation using supercritical fluids and microencapsulation, agglomeration phenomena, special considerations in mixing explosive particles and the production of nanoparticles. The second section discusses the characterization of particulate materials. Techniques and methods such as particle size analysis, morphology elucidation and the determination of chemical and thermal properties are presented. The wettability of powders and rheological behavior of suspensions and solids are also considered. Furthermore, methods of determining the performance of particular energetic materials are described. Each chapter deals with fundamentals and application possibilities of the various methods presented, with particular emphasis on issues applicable to particulate energetic materials. The book is thus equally relevant for chemists, physicists, material scientists, chemical and mechanical engineers and anyone interested or engaged in particle processing and characterization technologies.

Microstructural Characterization of Materials

Microstructural Characterization of Materials
Author: David Brandon
Publisher: John Wiley & Sons
Total Pages: 517
Release: 2013-03-21
Genre: Technology & Engineering
ISBN: 1118681487

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Microstructural characterization is usually achieved by allowing some form of probe to interact with a carefully prepared specimen. The most commonly used probes are visible light, X-ray radiation, a high-energy electron beam, or a sharp, flexible needle. These four types of probe form the basis for optical microscopy, X-ray diffraction, electron microscopy, and scanning probe microscopy. Microstructural Characterization of Materials, 2nd Edition is an introduction to the expertise involved in assessing the microstructure of engineering materials and to the experimental methods used for this purpose. Similar to the first edition, this 2nd edition explores the methodology of materials characterization under the three headings of crystal structure, microstructural morphology, and microanalysis. The principal methods of characterization, including diffraction analysis, optical microscopy, electron microscopy, and chemical microanalytical techniques are treated both qualitatively and quantitatively. An additional chapter has been added to the new edition to cover surface probe microscopy, and there are new sections on digital image recording and analysis, orientation imaging microscopy, focused ion-beam instruments, atom-probe microscopy, and 3-D image reconstruction. As well as being fully updated, this second edition also includes revised and expanded examples and exercises, with a solutions manual available at http://develop.wiley.co.uk/microstructural2e/ Microstructural Characterization of Materials, 2nd Edition will appeal to senior undergraduate and graduate students of material science, materials engineering, and materials chemistry, as well as to qualified engineers and more advanced researchers, who will find the book a useful and comprehensive general reference source.

TMS 2011 140th Annual Meeting and Exhibition, Materials Processing and Energy Materials

TMS 2011 140th Annual Meeting and Exhibition, Materials Processing and Energy Materials
Author: The Minerals, Metals & Materials Society (TMS)
Publisher: John Wiley & Sons
Total Pages: 774
Release: 2011-04-12
Genre: Technology & Engineering
ISBN: 1118062094

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Materials science and engineering professionals from around the world gathered at the TMS 2011 Annual Meeting & Exhibition to network, present the latest research and industrial applications, and collaborate on ways to further innovation and advancement in the field. The meeting featured more than 70 symposia and some 3,000 presentations. The Supplemental TMS 2011 Proceedings collect some of the most important papers presented at the meeting, giving readers the opportunity to benefit from the latest discoveries in mineral, metals, and materials research. Topics cover everything from minerals processing and primary metals production to basic research and advanced materials applications. Moreover, you'll learn about the latest research efforts within the industry to develop sustainable, environmentally friendly products and processes.

Analysis and Computation of Microstructure in Finite Plasticity

Analysis and Computation of Microstructure in Finite Plasticity
Author: Sergio Conti
Publisher: Springer
Total Pages: 266
Release: 2015-04-23
Genre: Science
ISBN: 3319182420

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This book addresses the need for a fundamental understanding of the physical origin, the mathematical behavior and the numerical treatment of models which include microstructure. Leading scientists present their efforts involving mathematical analysis, numerical analysis, computational mechanics, material modelling and experiment. The mathematical analyses are based on methods from the calculus of variations, while in the numerical implementation global optimization algorithms play a central role. The modeling covers all length scales, from the atomic structure up to macroscopic samples. The development of the models ware guided by experiments on single and polycrystals and results will be checked against experimental data.

Proceedings of the 2014 Energy Materials Conference

Proceedings of the 2014 Energy Materials Conference
Author: The Minerals, Metals & Materials Society (TMS)
Publisher: John Wiley & Sons
Total Pages: 952
Release: 2015-04-15
Genre: Technology & Engineering
ISBN: 1119027985

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This DVD contains a collection of papers presented at EnergyMaterials 2014, a conference organized jointly by The ChineseSociety for Metals (CSM) and The Minerals, Metals & MaterialsSociety (TMS), and held November 4-6, 2014, in Xi’an, ShaanxiProvince, China. With the rapid growth of the world’s energyproduction and consumption, the important role of energy materialshas achieved worldwide acknowledgement. Material producers andconsumers constantly seek the possibility of increasing strength,improving fabrication and service performance, simplifyingprocesses, and reducing costs. Energy Materials 2014 has provided aforum for academics, researchers, and engineers around the world toexchange state-of-the-art development and information on issuesrelated to energy materials. The papers on the DVD are organized around the followingtopics: Materials for Coal-Based Systems Materials for Gas Turbine Systems Materials for Nuclear Systems Materials for Oil and Gas Materials for Pressure Vessels

Microstructural Analysis

Microstructural Analysis
Author: J. McCall
Publisher: Springer
Total Pages: 470
Release: 1973-07
Genre: Technology & Engineering
ISBN:

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During recent years, people involved in developing new metals and materials for use in some of the rather extreme conditions of stress, temperature, and environment have relied heavily on the microstructural condition of their materials. In fact, many of the newer materials, such as dispersion-strengthened alloys, have been designed almost entirely by first determining the microstruc ture desired and then finding the right combination of composition, heat treatment, and mechanical working that will result in the de sired microstructure. Furthermore, the extremely high reliability required of materials used today, for example, in aerospace and nuclear energy systems, requires close control on the microstruc tural conditions of materials. This is clearly evident from even a cursory examination of recently written specifications for mate rials where rather precise microstructural parameters are stipu lated. Whereas specifications written several years ago may have included microstructural requirements for details such as ASTM grain size or graphite type, today's specifications are beginning to include such things as volume fraction of phases, mean free path of particles, and grain intercept distances. Rather arbitrary terms such as "medium pearlite" have been replaced by requirements such as "interlamella spacing not to exceed 0. 1 micron. " Finally, materials users have become increasingly aware that when a material does fail, the reason for its failure may be found by examining and "reading" its microstructure. The responsibility for a particular microstructure and a resulting failure is a matter of growing importance in current product liability consider ations.

Energy Research Abstracts

Energy Research Abstracts
Author:
Publisher:
Total Pages: 464
Release: 1994
Genre: Power resources
ISBN:

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Generation and Characterization of Anisotropic Microstructures in Rare Earth-Iron-Boron Alloys

Generation and Characterization of Anisotropic Microstructures in Rare Earth-Iron-Boron Alloys
Author:
Publisher:
Total Pages: 133
Release: 2012
Genre:
ISBN:

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The goal of this work is to investigate methods in which anisotropy could be induced in fine-grained alloys. We have identified two general processing routes to creating a fine, textured microstructure: form an amorphous precursor and devitrify in a manner that induces texture or form the fine, textured microstructure upon cooling directly from the liquid state. Since it is possible to form significant amounts of amorphous material in RE-Fe-B alloys, texture could be induced through biasing the orientationof the crystallites upon crystallization of the amorphous material. One method of creating this bias is to form glassy material and apply uniaxial pressure during crystallization. Experiments on this are presented. All of the work presented here utilizes melt-spinning, either to create precursor material, or to achieve a desired final microstructure. To obtain greater control of the system to process these materials, a study was done on the effects of heating the wheel and modifying the wheel's surface finish on glass formation and phase selection. The second general approach--creating the desired microstructure directly from the liquid--can be done through directional rapid solidification. In particular, alloys melt-spun at low tangential wheel speeds often display directional columnar growth through a portion of the ribbon. By refining and stabilizing the columnar growth, a highly textured fine microstructure is achieved. The effects of adding a segregating element (Ag) on the columnar growth are characterized and presented.