GRAIN GROWTH AND PHASE FORMATION IN ION-IRRADIATED METAL ALLOY THIN FILMS. PDF Download
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Author: DALE EDWARD ALEXANDER
Publisher:
ISBN:
Category :
Languages : en
Pages : 213
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Book Description
heat-of-mixing released during irradiation.
Author: DALE EDWARD ALEXANDER
Publisher:
ISBN:
Category :
Languages : en
Pages : 213
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Book Description
heat-of-mixing released during irradiation.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 10
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Book Description
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.
Author:
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ISBN:
Category :
Languages : en
Pages : 7
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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.
Author: A. T. Motta
Publisher:
ISBN:
Category : Grain growth
Languages : en
Pages : 13
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Book Description
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.
Author: Seita Matteo
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659662782
Category :
Languages : en
Pages : 252
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Book Description
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.
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Category : Power resources
Languages : en
Pages : 852
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Category : Aeronautics
Languages : en
Pages : 702
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Author: Gary S. Was
Publisher: Springer Science & Business Media
ISBN: 3540494715
Category : Technology & Engineering
Languages : en
Pages : 839
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Book Description
This book is an eye-opening treatise on the fundamentals of the effects of radiation on metals and alloys. When energetic particles strike a solid, numerous processes occur that can change the physical and mechanical properties of the material. Metals and alloys represent an important class of materials that are subject to intense radiation fields. Radiation causes metals and alloys to swell, distort, blister, harden, soften and deform. This textbook and reference covers the basics of particle-atom interaction for a range of particle types, the amount and spatial extent of the resulting radiation damage, the physical effects of irradiation and the changes in mechanical behavior of irradiated metals and alloys.
Author:
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 1584
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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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.
