Download or read book In situ Field ion Microscope Study of the Recovery Behavior of Ion irradiated Tungsten and Tungsten Alloys written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Five grades of W specimens with different purity levels were irradiated to a dose of typicaly 5 x 10/sup 12/ ion cm/sup -2/ at 18/sup 0/K. Examination with a low-temperature field-ion microscope showed the isochronal-annealing spectra of the specimens to result from a large self-interstitial atom (SIA) flux at approx. 38/sup 0/K, followed by significant SIA flux from approx. 50 to 80/sup 0/K and a small amount of additional recovery up to 120/sup 0/K. The spectra for these specimens were essentially identical between 18 and 120/sup 0/K. High-purity W specimens doped with C showed only a small reduction in the amount of recovery observed for the long-range migration peak at 38/sup 0/K. The isochronal recovery spectra for W-Re specimens were different from the isochronal recovery spectra of pure W specimens. For both alloys the recovery of the Stage I long-range migration peak at 38/sup 0/K was strongly suppressed. All recovery from 18 to 120/sup 0/K was virtually eliminated indicating that during the long-range migration substage at 38/sup 0/K tightly-bound, immobile SIA-Re complexes were formed that suppressed the SIA--SIA reaction. This effect was observed at high Re atom concentrations. The lack of any significant differences for the annealing spectra of the five purity-levels of undoped W and the appearance of impurity effects in the extremely concentrated alloys indicated that the early Stage II recovery observed in the annealing spectra of self-ion irradiated high-purity W was intrinsic. Because of the highly inhomogeneous SIA distribution of the W/sup +/ ion damage, the SIA--SIA interaction during Stage I long-range migration at 38/sup 0/K appeared to be the dominant trapping mechanism. The early Stage II SIA recovery was attributed to the migration or dissolution of these SIA clusters.

Download or read book An in Situ Field Ion Microscope Study of the Recovery Behavior of Heavy Metal Ion Irradiated Tungsten Tungsten rhenium Alloys and Molybdenum written by Charles Hart Nielsen and published by . This book was released on 1977 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An In situ Field Ion Microscope Study of Irradiated Tungsten and Tungsten Alloys II The Recovery Behavior in Stages I and II written by and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book In situ Field ion Microscope Study of the Recovery Behavior of Heavy Metal Ion irradiated Tungsten Tungsten rhenium Alloys and Molybdenum 30 KeV W sup and Mo sup written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Three field ion microscope (FIM) experiments were carried out to study the annealing behavior of heavy ion irradiated tungsten, tungsten (rhenium) alloys and molybdenum. The first experiment dealt with the stage I long-range migration of tungsten self interstitial atoms (SIAs) in high purity tungsten of resistivity ratio, R = 24,000 (R = rho/sub 300//rho/sub 4/./sub 2/, where rho/sub 300/ and rho/sub 4/./sub 2/ are the room temperature and 0/sup 0/C resistivities). The FIM specimens were irradiated in situ at 18 K with 30 keV W/sup +/ ions to an average dose of 5 x 10/sup 12/ ions cm/sup -2/ and subsequently examined by the pulsed-field evaporation technique. The second experiment dealt with the phenomenon of impurity atom trapping of SIAs during long-range migration. It was shown that rhenium atoms in a tungsten matrix tend to capture tungsten SIAs and remain bound up to temperatures as high as 390 K. The final experiment was concerned with the low temperature annealing kinetics of irradiated molybdenum. High purity molybdenum of resistivity ratio R = 5700 was irradiated at 10 K with 30 keV Mo/sup +/ ions to a dose of approximately 5 x 10/sup 12/ ions cm/sup -2/. The results indicated that the electric field has only a minimal effect on the SIA annealing kinetics. This tends to strengthen the contention that the molybdenum SIA becomes mobile at 32 K.

Download or read book A Field Ion Microscope Study of the Structure and Recovery Behavior of Irradiated Tungsten and Tungsten Alloys written by Kenneth Lane Wilson and published by . This book was released on 1975 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An In situ Field Ion Microscope Study of Stage I Recovery in Tungsten Irradiated with 20 KeV W written by Ronald Merlin Scanlan and published by . This book was released on 1971 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An In situ Field Ion Microscope Study of Irradiated Tungsten and Tungsten Alloys I The Volume Change of Migration of the Stage I Self interstitial Atom Report written by and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 1212 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 1978 with total page 1018 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1980 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.

Download or read book Study of Stages I to IV of Irradiated Or Quenched Tungsten and Tungsten Alloys by Field ion Microscopy written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress since 1972 in applying the quantitative field-ion microscope (FIM) technique to the study of point defects in irradiated tungsten and tungsten alloys or quenched tungsten is reviewed. Emphasis was on ascertaining recovery mechanisms for the major recovery stages which are consistent with both other FIM observations as well as observations employing more macroscopic techniques; hence point defect recovery models are presented for recovery Stages I to III. (49 references) (auth).

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 1324 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book INIS Atomindex written by and published by . This book was released on 1980 with total page 1040 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Masters Theses in the Pure and Applied Sciences written by W. H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 22 (thesis year 1977) a total of 10,658 theses titles from 28 Canadian and 227 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. While Volume 22 reports theses submitted in 1977, on occasion, certain universities do report theses submitted in previous years but not reported at the time.

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 1976-10 with total page 770 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physics Briefs written by and published by . This book was released on 1993 with total page 1058 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Concise Encyclopedia of Materials Characterization written by R.W. Cahn and published by Elsevier. This book was released on 2016-01-22 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt: To use materials effectively, their composition, degree of perfection, physical and mechanical characteristics, and microstructure must be accurately determined. This concise encyclopledia covers the wide range of characterization techniques necessary to achieve this. Articles included are not only concerned with the characterization techniques of specific materials such as polymers, metals, ceramics and semiconductors but also techniques which can be applied to materials in general. The techniques described cover bulk methods, and also a number of specific methods to study the topography and composition of surface and near-surface regions. These techniques range from the well-established and traditional to the very latest including: atomic force microscopy; confocal optical microscopy; gamma ray diffractometry; thermal wave imaging; x-ray diffraction and time-resolved techniques. This unique concise encyclopedia comprises 116 articles by leading experts in the field from around the world to create the ideal guide for materials scientists, chemists and engineers involved with any aspect of materials characterization. With over 540 illustrations, extensive cross-referencing, approximately 900 references, and a detailed index, this concise encyclopedia will be a valuable asset to any materials science collection.