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Title: Structural phase stability in nanocrystalline titanium to 161 GPa

Nanocrystalline titanium (nc-Ti) metal was investigated up to 161 GPa at room temperature using a diamond anvil cell. X-ray diffraction and electrical resistance techniques were used to investigate the compressibility and structural phase stability. nc-Ti is observed to undergo three structural phase transitions at high pressures, starting with α → ω at 10GPa and followed by ω → γ at 127GPa and γ → δ at 140GPa. The observed structural phase transitions, as well as compressibility, are consistent with previously reported values for coarse grained Ti (c-Ti). The high pressure experiments on nc-Ti samples do no show any significant variation of the α → ω transition pressure under varying nonhydrostatic conditions. This is in sharp contrast to c-Ti, where a significant decrease in the α → ω transition pressure is observed under increasing nonhydrostatic conditions. As a result, this would indicate that the decrease in grain size in nano grained titanium makes the α → ω phase transition less sensitive to shear stresses as compared to bulk or c-Ti.
Authors:
 [1] ;  [1] ;  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Alabama at Birmingham, Birmingham, AL (United States)
Publication Date:
Grant/Contract Number:
NA0002014; AC52-06NA25396
Type:
Published Article
Journal Name:
Materials Research Express
Additional Journal Information:
Journal Volume: 1; Journal Issue: 3; Journal ID: ISSN 2053-1591
Publisher:
IOP Publishing
Research Org:
Univ. of Alabama at Birmingham, Birmingham, AL (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; high pressure; diamond anvil cell; titanium; electrical resistance
OSTI Identifier:
1342435
Alternate Identifier(s):
OSTI ID: 1251166

Velisavljevic, Nenad, Jacobsen, Matthew K., and Vohra, Yogesh K.. Structural phase stability in nanocrystalline titanium to 161 GPa. United States: N. p., Web. doi:10.1088/2053-1591/1/3/035044.
Velisavljevic, Nenad, Jacobsen, Matthew K., & Vohra, Yogesh K.. Structural phase stability in nanocrystalline titanium to 161 GPa. United States. doi:10.1088/2053-1591/1/3/035044.
Velisavljevic, Nenad, Jacobsen, Matthew K., and Vohra, Yogesh K.. 2014. "Structural phase stability in nanocrystalline titanium to 161 GPa". United States. doi:10.1088/2053-1591/1/3/035044.
@article{osti_1342435,
title = {Structural phase stability in nanocrystalline titanium to 161 GPa},
author = {Velisavljevic, Nenad and Jacobsen, Matthew K. and Vohra, Yogesh K.},
abstractNote = {Nanocrystalline titanium (nc-Ti) metal was investigated up to 161 GPa at room temperature using a diamond anvil cell. X-ray diffraction and electrical resistance techniques were used to investigate the compressibility and structural phase stability. nc-Ti is observed to undergo three structural phase transitions at high pressures, starting with α → ω at 10GPa and followed by ω → γ at 127GPa and γ → δ at 140GPa. The observed structural phase transitions, as well as compressibility, are consistent with previously reported values for coarse grained Ti (c-Ti). The high pressure experiments on nc-Ti samples do no show any significant variation of the α → ω transition pressure under varying nonhydrostatic conditions. This is in sharp contrast to c-Ti, where a significant decrease in the α → ω transition pressure is observed under increasing nonhydrostatic conditions. As a result, this would indicate that the decrease in grain size in nano grained titanium makes the α → ω phase transition less sensitive to shear stresses as compared to bulk or c-Ti.},
doi = {10.1088/2053-1591/1/3/035044},
journal = {Materials Research Express},
number = 3,
volume = 1,
place = {United States},
year = {2014},
month = {9}
}