Download or read book Nucleation of the Alpha to Beta Phase Transformation in Tin written by Cornelius Gerard Durdaller and published by . This book was released on 1962 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nucleation Rates in the Alpha to Beta Transformation of Tin written by and published by . This book was released on 1960 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nucleation rate of the alpha (gray) to beta (white) tin transformation was measured as a function of temperature and alpha tin particle ize by an x-ray diffraction technique. The power specimens of alpha tin were essentially monodisperse and the small dimension of the particles of these specimens was varied from 13 to 75 microns. The fraction isothermall tran formed as a function of time was determined continually from integrate intensity measurements of the 220 x-ra reflection of alpha tin. Inasmuch as the period for propagation of the beta phase is negligi le in such small particles and since there was not internucleation between particles, it was possible to obtain the nucleation rate irectly from the transformation data. Several types of nucleation sites of differing potency were found to be operative in the nucleation process. Analysis of the temperature dependence of rate constants at a given fraction transformed suggests that the active site are regions of higher free energy and not catalytic interfaces. Appreciable induction periods were observed at the lower temperatures of transformation. They may be described in terms of a theory relating to the effect of decreased atomic mobility in delaying the establishment of a steady-state distribution of embryos.
Download or read book Nucleation Rates in the Alpha to Beta Transformation of Tin written by C. G. Durdaller and published by . This book was released on 1962* with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nucleation rate of the alpha (gray) to beta (white) tin transformation was measured as a function of temperature and alpha tin particle ize by an x-ray diffraction technique. The power specimens of alpha tin were essentially monodisperse and the small dimension of the particles of these specimens was varied from 13 to 75 microns. The fraction isothermall tran formed as a function of time was determined continually from integrate intensity measurements of the 220 x-ra reflection of alpha tin. Inasmuch as the period for propagation of the beta phase is negligi le in such small particles and since there was not internucleation between particles, it was possible to obtain the nucleation rate irectly from the transformation data. Several types of nucleation sites of differing potency were found to be operative in the nucleation process. Analysis of the temperature dependence of rate constants at a given fraction transformed suggests that the active site are regions of higher free energy and not catalytic interfaces. Appreciable induction periods were observed at the lower temperatures of transformation. They may be described in terms of a theory relating to the effect of decreased atomic mobility in delaying the establishment of a steady-state distribution of embryos.
Download or read book A Dilatometric Study of Nucleation in the Alpha to Beta Transformation in Tin written by Lawrence Joseph Choman and published by . This book was released on 1969 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nucleation and Crystal Growth written by Keshra Sangwal and published by John Wiley & Sons. This book was released on 2018-07-13 with total page 509 pages. Available in PDF, EPUB and Kindle. Book excerpt: A unique text presenting practical information on the topic of nucleation and crystal growth processes from metastable solutions and melts Nucleation and Crystal Growth is a groundbreaking text thatoffers an overview and description of the processes and phenomena associated with metastability of solutions and melts. The author—a noted expert in the field—puts the emphasis on low-temperature solutions that are typically involved in crystallization in a wide range of industries. The text begins with a review of the basic knowledge of solutions and the fundamentals of crystallization processes. The author then explores topics related to the metastable state of solutions and melts from the standpoint of three-dimensional nucleation and crystal growth. Nucleation and Crystal Growth is the first text that contains a unified description and discussion of the many processes and phenomena occurring in the metastable zone of solutions and melts from the consideration of basic concepts of structure of crystallization. This important text: Outlines an interdisciplinary approach to the topic and offers an essential guide for crystal growth practitioners in materials science, physics, and chemical engineering Contains a comprehensive content that details the crystallization processes starting from the initial solutions and melts, all the way through nucleation, to the final crystal products Presents a unique focus and is the first book on understanding, and exploiting, metastability of solutions and melts in crystallization processes Written for specialists and researchers in the fields of materials science, condensed matter physics, and chemical engineering. Nucleation and Crystal Growth is a practical resource filled with hands-on knowledge of nucleation and crystal growth processes from metastable solutions and melts.
Download or read book Minerals Yearbook written by and published by . This book was released on 1964 with total page 1270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Government Research Reports written by and published by . This book was released on 1963 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transactions of the Metallurgical Society of AIME written by Metallurgical Society of AIME. and published by . This book was released on 1969 with total page 1296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book 1964 Proceedings National Aerospace Electronics Conference written by and published by . This book was released on 1964 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1973 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nucleation and Phase Transformation written by Benjamin Ruber Scharifker and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transactions written by Metallurgical Society of AIME. and published by . This book was released on 1967 with total page 864 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kinetics in Materials Science and Engineering written by Dennis W. Readey and published by CRC Press. This book was released on 2017-01-27 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A pedagogical gem.... Professor Readey replaces ‘black-box’ explanations with detailed, insightful derivations. A wealth of practical application examples and exercise problems complement the exhaustive coverage of kinetics for all material classes." –Prof. Rainer Hebert, University of Connecticut "Prof. Readey gives a grand tour of the kinetics of materials suitable for experimentalists and modellers.... In an easy-to-read and entertaining style, this book leads the reader to fundamental, model-based understanding of kinetic processes critical to development, fabrication and application of commercially-important soft (polymers, biomaterials), hard (ceramics, metals) and composite materials. It is a must-have for anyone who really wants to understand how to make materials and how they will behave in service." --Prof. Bill Lee, Imperial College London, Fellow of the Royal Academy of Engineering "A much needed text filing the gap between an introductory course in materials science and advanced materials-specific kinetics courses. Ideal for the undergraduate interested in an in-depth study of kinetics in materials." –Prof. Mark E. Eberhart, Colorado School of Mines This book provides an in-depth introduction to the most important kinetic concepts in materials science, engineering, and processing. All types of materials are addressed, including metals, ceramics, polymers, electronic materials, biomaterials, and composites. The expert author with decades of teaching and practical experience gives a lively and accessible overview, explaining the principles that determine how long it takes to change material properties and make new and better materials. The chapters cover a broad range of topics extending from the heat treatment of steels, the processing of silicon integrated microchips, and the production of cement, to the movement of drugs through the human body. The author explicitly avoids "black box" equations, providing derivations with clear explanations.
Download or read book Transactions of the American Institute of Mining Metallurgical and Petroleum Engineers written by American Institute of Mining, Metallurgical, and Petroleum Engineers and published by . This book was released on 1969 with total page 1298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Some vols., 1920-1949, contain collections of papers according to subject.
Download or read book The Study of the Beta to Gamma Phase Transformation in High nb Ti al nb Alloys written by Sonalika Goyel and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This research was aimed at the nature of the beta-to-gamma phase transformation, including its kinetics, effects of composition, grain boundaries, and surfaces-both internal and external. Further, in order to inhibit the formation of gamma-phase upon quenching the beta-phase, the influence of Cr-a beta-stabilizer-and the effects of boron segregation were also studied. This research shows that the beta grain boundaries always act as the preferred nucleation sites for gamma-phase formation upon quenching as well as during slower cooling. The gamma-phase was observed to form with a Widmanstätten lath morphology at all temperatures and cooling rates, including high temperatures and slow cooling rates. In the absence of any grain boundaries, the sample surfaces act as the preferred nucleation sites for the Widmanstätten gamma-phase. The gamma-phase was observed to nucleate in two distinct stages upon cooling at relatively slower rates, and produced two morphologies: 1) Widmanstätten laths and 2) a plate-like gamma-phase morphology. The sigma-phase did not form upon slow cooling to room temperature, as was predicted by thermodynamic calculations. Aging a quenched beta-phase, however, yielded a gamma+sigma microstructure. It was noted that additions of as little as 1.5 at% Cr could drastically reduce the gamma-phase volume fraction, primarily by slowing its growth rate. Alloys with low amounts of boron additions were studies to investigate the effect of beta grain boundary 'poisoning' on gamma-phase formation upon quenching. Boron additions were shown to increase the nucleation rate of the gamma-phase at the beta-phase grain boundaries.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976-04 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
