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Granato, A.V. Gordon, Craig Alan 2012-05-29T17:26:16Z 2012-05-29T17:26:16Z 10000-01-01 2000 The Interstitialcy Theory offers a unified description of the solid, liquid, and amorphous states of condensed matter, including a direct criterion for the onset of melting. A major prediction of the theory is that the equilibrium concentration of interstitial defects should be only about an order of magnitude less than the vacancy concentration near the melting temperature. Of the various properties affected by the presence of interstitials, the shear modulus is known to be particularly sensitive. A non-contact EMAT technique of ultrasonic generation and detection was used to make high temperature measurements of the C44 and C' shear elastic moduli in aluminum. The results show a large C44 deviation just below the melting temperature and a much smaller effect for C', which is to be expected for interstitials in FCC crystals. The results are analyzed to give a detected interstitial concentration of 1.7 ± 0.6 x 10^4 just below the melting temperature of 933 K. This corresponds to a reasonable range for the interstitial formation enthalpy and entropy, and supports the prediction of the Interstitialcy Theory. Submitted by William Weathers (weathrs2@illinois.edu) on 2012-05-29T17:26:16Z No. of bitstreams: 1 2000_gordon.pdf: 1518106 bytes, checksum: f5a33fac6b4f681f7627e866329af375 (MD5) Made available in DSpace on 2012-05-29T17:26:16Z (GMT). No. of bitstreams: 1 2000_gordon.pdf: 1518106 bytes, checksum: f5a33fac6b4f681f7627e866329af375 (MD5) Previous issue date: 2000 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Weathers (weathrs2@illinois.edu) on 2012-05-29T17:26:16Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:34:57-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only http://hdl.handle.net/2142/31251 4280354 en ©2000 Gordon Interstitialcy Theory aluminum non-contact electromagnetic acoustic transducer Equilibrium concentration of interstitials in aluminum just below the melting temperature Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.