Grain growth in nanocrystalline metal thin films under in situ ion-beam irradiation

D. Kaoumi, Arthur Thompson Motta, R. C. Birtcher

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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 monotonlcally 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-D0 n=KΦ. 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.

Original languageEnglish (US)
Title of host publicationEffects of Radiation on Materials
Subtitle of host publication23rd International Symposium
PublisherASTM International
Pages206-218
Number of pages13
ISBN (Print)9780803134218
StatePublished - Jan 1 2008
EventEffects of Radiation on Materials: 23rd International Symposium - San Jose, CA, United States
Duration: Jun 13 2006Jun 15 2006

Publication series

NameASTM Special Technical Publication
Volume1492 STP
ISSN (Print)0066-0558

Other

OtherEffects of Radiation on Materials: 23rd International Symposium
CountryUnited States
CitySan Jose, CA
Period6/13/066/15/06

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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  • Cite this

    Kaoumi, D., Motta, A. T., & Birtcher, R. C. (2008). Grain growth in nanocrystalline metal thin films under in situ ion-beam irradiation. In Effects of Radiation on Materials: 23rd International Symposium (pp. 206-218). (ASTM Special Technical Publication; Vol. 1492 STP). ASTM International.