Thermally induced acoustic emission in glasses |
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| Affiliation: | 1. Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287-1604, United States;2. Leroy Eyring Center for Solid State Science, Arizona State University, Tempe, AZ 85287-1704, United States;3. School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287-1404, United States;1. University of Hawaii, Hawaii Institute of Geophysics and Planetology, Honolulu, HI 96822, U.S.A.;2. Xinjiang Key Laboratory of Solid State Physics and Devices, Xinjiang University, Urumqi, China;3. School of Physics and Technology, Xinjiang University, Urumqi, China;s. Department of Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, CA 95064 U.S.A. |
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| Abstract: | We have measured acoustic emission (AE) in commercially available silicate and metallic glasses while heating through the glass temperature (Tg). In silicate glasses AE is emitted at Tg which may be due to free volume diffusing to the surface. In amorphous Fe40Ni40P14B6 tapes the AE and self twist (ST) show a strong correlation in three distinct regions. Region 1 (150–225°C) is probably caused by the production process, ie secondary cooling. Region 2 (225–325°C) is probably due to structural relaxation. Crystallization occurs in Region 3 (325–450°C). The AE and ST are both irreversible when the sample is reheated to any specific temperature. The effects of varying stress levels and magnetic field are also examined. Stress relief is observed by AE measurements during an isothermal anneal. |
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