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Shock temperature measurements in metals: New results for an Fe alloy

Bass, Jay D. and Ahrens, Thomas J. and Abelson, John R. and Hua, Tan (1990) Shock temperature measurements in metals: New results for an Fe alloy. Journal of Geophysical Research B, 95 (B13). pp. 21767-21776. ISSN 0148-0227. doi:10.1029/JB095iB13p21767.

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The temperature of a Fe-Cr-Ni alloy (304 stainless steel) has been measured during shock compression using a high-speed radiometric technique. Experiments were performed on high-quality thick films deposited on sapphire and LiF windows. The samples had no observable porosity or defects and closely meet the ideal criteria for shock temperature measurements. Data obtained with both Al_2O_3 and LiF windows are internally consistent, indicating that they remain transparent to high pressures and are thus suitable windows for shock temperature measurements. Our data yield stainless steel melting temperatures ranging from 4570±310K at 138 GPa to 5710±340 K at 215 GPa, and additionally provide bounds on the initial Hugoniot temperatures of the sample between 5600±340 K at 234 GPa (near the solidus) and 6580±440 K at 283 (in the liquid field). Taken together, these data define a smooth curve for melting of the alloy up to 271 GPa and 5860 K, which should represent a point on the Iiquidus. Melting along the Hugoniot begins at approximately 234 GPa and 5600 K, as compared with 242 GPa and 6400 K for pure Fe. At the pressure of the inner core-outer core boundary, the melting point of 304 stainless steel is lower than that of pure Fe by ≈ 1450 K, as compared with only 110 K at 1 atm. These results demonstrate that upon alloying with Ni and Cr the melting point depression of Fe and thus material likely to comprise the inner core increases with increasing pressure.

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Additional Information:Copyright 1990 by the American Geophysical Union. (Received July 23, 1990; revised September 28, 1990; accepted October 14, 1990.) Paper number 90JB02163. We thank Q. Williams R. Jeanloz, R. G. McQueen, D. Isaak, R. Boehler, and A. Chopelas for preprints of their work. E. Gelle, M. Long, and K. Gallagher provided critical assistance in conducting these experiments. We appreciate the comments of two anonymous reviewers on an earlier version of this work. We thank the Max Planck Institut für Chemie for assistance with the preparation of this manuscript. This research was supported by NSF grants to the University of Illinois and the California Institute of Technology. Contribution 4895, California Institute of Technology.
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Caltech Division of Geological and Planetary Sciences4895
Issue or Number:B13
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ID Code:50817
Deposited By: George Porter
Deposited On:27 Oct 2014 03:38
Last Modified:10 Nov 2021 19:01

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