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Temperature Dependence of Shock‐Induced Phase Transformations in Iron

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3 Author(s)
Johnson, P.C. ; Arthur D. Little, Inc., Cambridge, Massachusetts ; Stein, B.A. ; Davis, R.S.

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Shock‐induced phase transformations in iron have been investigated in the temperature range 78° to 1158°K. The pressure for transformation over this temperature range has been determined by a technique that depends on microstructural changes associated with a phase transformation. A discontinuity in the temperature‐pressure relationship was observed at 115 kbars and 775°K. Two distinct transformation microstructures were observed. It is postulated that the results obtained above 775°K are due to the expected transformation from alpha iron to gamma iron whereas the results below 775°K are related to a transformation from alpha iron to a presently undetermined new phase.

Published in:

Journal of Applied Physics  (Volume:33 ,  Issue: 2 )