RAYLEIGH-TAYLOR STRENGTH EXPERIMENTS OF THE PRESSURE-INDUCED alpha->epsilon->alpha' PHASE TRANSITION IN IRON

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We present here the first dynamic Rayleigh-Taylor (RT) strength measurement of a material undergoing solid-solid phase transition. Iron is quasi-isentropically driven across the pressure-induced bcc ({alpha}-Fe) {yields} hcp ({var_epsilon}-Fe) phase transition and the dynamic strength of the {alpha}, {var_epsilon} and reverted {alpha}{prime} phases have been determined via proton radiography of the resulting Rayleigh-Taylor unstable interface between the iron target and high-explosive products. Simultaneous velocimetry measurements of the iron free surface yield the phase transition dynamics and, in conjunction with detailed hydrodynamic simulations, allow for determination of the strength of the distinct phases of iron. Forward analysis of the experiment via ... continued below

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6 p. (0.2 MB)

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Belof, J L; Cavallo, R M; Olson, R T; King, R S; Gray, G T; Holtkamp, D B et al. August 10, 2011.

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We present here the first dynamic Rayleigh-Taylor (RT) strength measurement of a material undergoing solid-solid phase transition. Iron is quasi-isentropically driven across the pressure-induced bcc ({alpha}-Fe) {yields} hcp ({var_epsilon}-Fe) phase transition and the dynamic strength of the {alpha}, {var_epsilon} and reverted {alpha}{prime} phases have been determined via proton radiography of the resulting Rayleigh-Taylor unstable interface between the iron target and high-explosive products. Simultaneous velocimetry measurements of the iron free surface yield the phase transition dynamics and, in conjunction with detailed hydrodynamic simulations, allow for determination of the strength of the distinct phases of iron. Forward analysis of the experiment via hydrodynamic simulations reveals significant strength enhancement of the dynamically-generated {var_epsilon}-Fe and reverted {alpha}{prime}-Fe, comparable in magnitude to the strength of austenitic stainless steels.

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6 p. (0.2 MB)

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PDF-file: 6 pages; size: 0.2 Mbytes

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  • Presented at: Rayleigh-Taylor Strength Experiments of the Pressure-Induced alpha->epsilon->alphaprime Phase Transition in Iron, Chicago, IL, United States, Jun 26 - Jul 02, 2011

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  • Report No.: LLNL-PROC-492911
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1022947
  • Archival Resource Key: ark:/67531/metadc846650

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  • August 10, 2011

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  • May 19, 2016, 3:16 p.m.

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  • April 17, 2017, 12:14 p.m.

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Belof, J L; Cavallo, R M; Olson, R T; King, R S; Gray, G T; Holtkamp, D B et al. RAYLEIGH-TAYLOR STRENGTH EXPERIMENTS OF THE PRESSURE-INDUCED alpha->epsilon->alpha' PHASE TRANSITION IN IRON, article, August 10, 2011; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc846650/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.