In-situ Experiments to Capture the Evolution of Microstructure During Phase Transformation of Titanium Under Dynamic Loading

doi:10.1051/epjconf/201818303020

Title: In-situ Experiments to Capture the Evolution of Microstructure During Phase Transformation of Titanium Under Dynamic Loading

Abstract

Under sufficient stresses, such as during dynamic loading, titanium experiences a phase transformation from hcp alpha phase to hexagonal omega phase. Omega phase is often retained in the microstructure after unloading, and has a strong influence on subsequent mechanical properties. Simulations suggest there are multiple pathways and underlying mechanisms for this transformation. Due to the incredibly short timescales involved, experimental measurements for model validation have been difficult. However, new capabilities at the Advanced Photon Source have enabled diffraction measurements during plate impact experiments to study the evolution of titanium during transformation. These high-rate data allow us to probe the mechanism and kinetics of phase transformations in new ways. Recent results will be presented and compared to post-mortem characterization of soft-recovered shocked specimens. Comparisons are then made with previous tests where material was shock-loaded and soft recovered for microstructural analysis. Together these techniques create a consistent picture of material behavior during the shock-induced α–ω phase transformation in titanium.

Authors:

^[1];

^[1]; Rigg, Paulo A. ^[2]; Gray, George T. ^[1]; Cerreta, Ellen K. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics; Argonne National Lab. (ANL), Argonne, IL (United States). Dynamic Compression Sector (DCS)

Publication Date:: 2018-09-07

Research Org.:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division

OSTI Identifier:: 1473817

Report Number(s):: LA-UR-18-21524
Journal ID: ISSN 2100-014X

Grant/Contract Number:: AC52-06NA25396; AC02-06CH11357; NA0002442

Resource Type:: Accepted Manuscript

Journal Name:: EPJ Web of Conferences

Additional Journal Information:: Journal Volume: 183; Conference: 12th International DYMAT Conference ; 2018-09-09 - 2018-09-09 ; Arcachon, France; Journal ID: ISSN 2100-014X

Publisher:: EDP Sciences

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Titanium, in-situ diffraction, shock, phase transition

Citation Formats


                    Morrow, Benjamin M., Jones, David R., Rigg, Paulo A., Gray, George T., and Cerreta, Ellen K. In-situ Experiments to Capture the Evolution of Microstructure During Phase Transformation of Titanium Under Dynamic Loading.  United States: N. p., 2018. 
        Web.  doi:10.1051/epjconf/201818303020.

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                    Morrow, Benjamin M., Jones, David R., Rigg, Paulo A., Gray, George T., & Cerreta, Ellen K. In-situ Experiments to Capture the Evolution of Microstructure During Phase Transformation of Titanium Under Dynamic Loading.  United States.  doi:10.1051/epjconf/201818303020.

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                    Morrow, Benjamin M., Jones, David R., Rigg, Paulo A., Gray, George T., and Cerreta, Ellen K. Fri .  
        "In-situ Experiments to Capture the Evolution of Microstructure During Phase Transformation of Titanium Under Dynamic Loading".  United States.  doi:10.1051/epjconf/201818303020.  https://www.osti.gov/servlets/purl/1473817.

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@article{osti_1473817,

  title        = {In-situ Experiments to Capture the Evolution of Microstructure During Phase Transformation of Titanium Under Dynamic Loading},

  author       = {Morrow, Benjamin M. and Jones, David R. and Rigg, Paulo A. and Gray, George T. and Cerreta, Ellen K.},

  abstractNote = {Under sufficient stresses, such as during dynamic loading, titanium experiences a phase transformation from hcp alpha phase to hexagonal omega phase. Omega phase is often retained in the microstructure after unloading, and has a strong influence on subsequent mechanical properties. Simulations suggest there are multiple pathways and underlying mechanisms for this transformation. Due to the incredibly short timescales involved, experimental measurements for model validation have been difficult. However, new capabilities at the Advanced Photon Source have enabled diffraction measurements during plate impact experiments to study the evolution of titanium during transformation. These high-rate data allow us to probe the mechanism and kinetics of phase transformations in new ways. Recent results will be presented and compared to post-mortem characterization of soft-recovered shocked specimens. Comparisons are then made with previous tests where material was shock-loaded and soft recovered for microstructural analysis. Together these techniques create a consistent picture of material behavior during the shock-induced α–ω phase transformation in titanium.},

  doi          = {10.1051/epjconf/201818303020},

  journal      = {EPJ Web of Conferences},

  number       = ,

  volume       = 183,

  place        = {United States},

  year         = {2018},

  month        = {9}

}

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DOI: 10.1051/epjconf/201818303020

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Figures / Tables:

Figure 1: Experimental setup of single-stage powder gun at DCS. The brass target plate containing the sample is fixed to the end of the powder gun (left). Diagnostics are attached to the back side of the sample. During testing, the projectile moves down the gun barrel (left), strikes the samplemore »

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