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

Journal Article · · EPJ Web of Conferences (Online)
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  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics; Argonne National Lab. (ANL), Argonne, IL (United States). Dynamic Compression Sector (DCS)
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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.
Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357; AC52-06NA25396; NA0002442
OSTI ID:
1473817
Alternate ID(s):
OSTI ID: 1808096
OSTI ID: 1810121
Report Number(s):
LA-UR-18-21524
Journal Information:
EPJ Web of Conferences (Online), Journal Name: EPJ Web of Conferences (Online) Vol. 183; ISSN 2100-014X
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English

References (11)

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Path dependency of phase transformations
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conference January 2018
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Figures / Tables (6)

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Table 1(p. 3)table Table 1
Table 2(p. 3)table Table 2
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Related Subjects

36 MATERIALS SCIENCE
Titanium
in-situ diffraction
shock
phase transition