Download or read book Ion induced Grain Growth in Multilayer and Coevaporated Metal Alloy Thin Films written by and published by . This book was released on 1990 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Irradiation experiments were conducted on multilayer (ML) and coevaporated (CO) thin films in order to examine the role that the heat of mixing ([Delta]H{sub mix}) has in ion-induced grain growth. Room temperature irradiations using 1.7 MeV Xe were performed in the High Voltage Electron Microscope at Argonne National Laboratory. The alloys studied (Pt-Ti, Pt-V, Pt-Ni, Au-Co and Ni-Al) spanned a large range of [Delta]H{sub mix} values. Comparison of grain growth rates between ML and CO films of a given alloy confirmed a heat of mixing effect. Differences in grain growth rates between ML and CO films scaled according to the sign and magnitude of [Delta]H{sub mix} of the system (with exception of the Pt-V system). Substantial variations in growth rates among CO alloy films experiencing similar irradiation damage demonstrated that a purely collisional approach is inadequate for describing ion-induced grain growth and consideration must also be given to material-specific properties. Results from CO alloy films were consistent with a thermal spike model of ion-induced grain growth. The grain boundary mobility was observed to be proportional to the thermal spike-related parameter, (F{sub D}2)/([Delta]H{sub coh}3), where F{sub D} is the deposited damage energy and [Delta]H{sub coh} is the cohesive energy.
Download or read book Thermal Spike Model of Ion induced Grain Growth written by and published by . This book was released on 1990 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: A thermal spike model has been developed to describe the phenomenon of ion irradiation-induced grain growth in metal alloy thin films. In single phase films where the driving force for grain growth is the reduction of grain boundary curvature, the model shows that ion-induced grain boundary mobility, M{sub ion}, is proportional to the quantity F{sub D}2/[Delta]H{sub coh}3, where F{sub D} is the deposited ion damage energy and [Delta]H{sub coh} is the cohesive energy of the element or alloy. Experimental strain growth results from ion irradiated coevaporated binary alloy films compare favorably with model predictions. 11 refs., 1 fig., 1 tab.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 520 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 1991 with total page 966 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book GRAIN GROWTH AND PHASE FORMATION IN ION IRRADIATED METAL ALLOY THIN FILMS written by DALE EDWARD ALEXANDER and published by . This book was released on 1990 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: heat-of-mixing released during irradiation.
Download or read book Metals Abstracts written by and published by . This book was released on 1993 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Grain Growth in Nanocrystalline Metal Thin Films Under In Situ Ion Beam Irradiation written by A. T. Motta and published by . This book was released on 2007 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: In-situ observations in a transmission electron microscope (TEM) were used to study the microstructure evolution in metal Zr, Pt, Cu, and Au nanocrystalline thin films under ion-beam irradiation. Free-standing films were prepared by sputter deposition. Samples were irradiated in-situ at the Intermediate Voltage Electron Microscope (IVEM) at Argonne National Laboratory with Ar and Kr ions to fluences in excess of 1016 ion/cm2. As a result of irradiation, grain growth was observed in all samples using Bright Field (BF) imaging in the TEM. The average grain size increased monotonically with ion fluence until it reached a saturation value. Similarly to thermal grain growth, the ion-irradiation induced grain growth curves could be best fitted with curves of the type: Dn-;D0n=K?. The irradiations were done at temperatures ranging from 20 to 773 K. The results suggest the existence of three regimes with respect to irradiating temperature: (i) a purely thermal regime, which appears to start above the bulk coarse-grained recrystallization temperature, (ii) a thermally assisted regime where thermal diffusion and irradiation effects combine to increase the rate of grain growth relative to that resulting from either of these mechanisms alone, and (iii) an athermal regime (low-temperature regime) where irradiation can by itself cause grain growth. The transition temperature between the athermal regime and the thermally assisted regime depends on the material, but is in the range 0.14-0.22 times the melting point. The influence of the ion type was also investigated on Zr-Fe irradiated with 600 keV Kr ions versus 600 keV Ar ions.
Download or read book Full Microstructure Control Through Ion induced Grain Growth Texturing and Constrained Deformation in Thin Metal Films written by Matteo Seita and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Full Microstructure Control Through Ion Irradiation written by Seita Matteo and published by LAP Lambert Academic Publishing. This book was released on 2015-01-29 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: When the interaction between energetic ions and matter is properly engineered, the microstructure of thin metal films can be tailored to the extent that polycrystals are transformed into single crystals through selective grain growth. At this level of control, microstructure engineering resembles painting: using an energetic ion-beam as the "paintbrush" and the metal film as the "canvas," materials scientists can directly "paint" novel, functional materials.
Download or read book Artificially Induced Grain Alignment in Thin Films Volume 1150 written by Vladimir Matias and published by . This book was released on 2009-11-17 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1991-04 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1991 with total page 1192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Menu International a Menu Guide and Directory written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book In Situ HVEM Study of Ion Irradiation induced Grain Growth in Au Thin Films written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In situ observations of 1.5 MeV Xe ion irradiated Au films at room temperature and at 150°C reveal the evolution of grain growth: the average grain size increases by the mechanisms of grain boundary migration and grain coalescence. 10 refs., 4 figs.
Download or read book Physics Briefs written by and published by . This book was released on 1994 with total page 1162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ion Beam Enhanced Grain Growth in Thin Films written by Harry Albert Atwater and published by . This book was released on 1987 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ion Beam Enhanced Grain Growth in Thin Films written by Harry Albert Atwater and published by . This book was released on 1987 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
