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Title: Direct imaging of short-range order and its impact on deformation in Ti-6Al

Abstract

Chemical short-range order (SRO) within a nominally single-phase solid solution is known to affect the mechanical properties of alloys. While SRO has been indirectly related to deformation, direct observation of the SRO domain structure, and its effects on deformation mechanisms at the nanoscale, has remained elusive. Here, we report the direct observation of SRO in relation to deformation using energy-filtered imaging in a transmission electron microscope (TEM). The diffraction contrast is enhanced by reducing the inelastically scattered electrons, revealing subnanometer SRO-enhanced domains. The destruction of these domains by dislocation planar slip is observed after ex situ and in situ TEM mechanical testing. These results confirm the impact of SRO in Ti-Al alloys on the scale of angstroms. The direct confirmation of SRO in relationship to dislocation plasticity in metals can provide insight into how the mechanical behavior of concentrated solid solutions by the material’s thermal history.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [2]; ORCiD logo [1]; ORCiD logo [2];  [5]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Nanjing Univ. (China)
  4. Bruker Nano Surface, Minneapolis, MN (United States)
  5. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); US Department of the Navy, Office of Naval Research (ONR)
OSTI Identifier:
1591853
Grant/Contract Number:  
AC02-05CH11231; N00014-16-1-2304
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 5; Journal Issue: 12; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Zhang, Ruopeng, Zhao, Shiteng, Ophus, Colin, Deng, Yu, Vachhani, Shraddha J., Ozdol, Burak, Traylor, Rachel, Bustillo, Karen C., Morris, J. W., Chrzan, Daryl C., Asta, Mark, and Minor, Andrew M. Direct imaging of short-range order and its impact on deformation in Ti-6Al. United States: N. p., 2019. Web. doi:10.1126/sciadv.aax2799.
Zhang, Ruopeng, Zhao, Shiteng, Ophus, Colin, Deng, Yu, Vachhani, Shraddha J., Ozdol, Burak, Traylor, Rachel, Bustillo, Karen C., Morris, J. W., Chrzan, Daryl C., Asta, Mark, & Minor, Andrew M. Direct imaging of short-range order and its impact on deformation in Ti-6Al. United States. doi:10.1126/sciadv.aax2799.
Zhang, Ruopeng, Zhao, Shiteng, Ophus, Colin, Deng, Yu, Vachhani, Shraddha J., Ozdol, Burak, Traylor, Rachel, Bustillo, Karen C., Morris, J. W., Chrzan, Daryl C., Asta, Mark, and Minor, Andrew M. Fri . "Direct imaging of short-range order and its impact on deformation in Ti-6Al". United States. doi:10.1126/sciadv.aax2799. https://www.osti.gov/servlets/purl/1591853.
@article{osti_1591853,
title = {Direct imaging of short-range order and its impact on deformation in Ti-6Al},
author = {Zhang, Ruopeng and Zhao, Shiteng and Ophus, Colin and Deng, Yu and Vachhani, Shraddha J. and Ozdol, Burak and Traylor, Rachel and Bustillo, Karen C. and Morris, J. W. and Chrzan, Daryl C. and Asta, Mark and Minor, Andrew M.},
abstractNote = {Chemical short-range order (SRO) within a nominally single-phase solid solution is known to affect the mechanical properties of alloys. While SRO has been indirectly related to deformation, direct observation of the SRO domain structure, and its effects on deformation mechanisms at the nanoscale, has remained elusive. Here, we report the direct observation of SRO in relation to deformation using energy-filtered imaging in a transmission electron microscope (TEM). The diffraction contrast is enhanced by reducing the inelastically scattered electrons, revealing subnanometer SRO-enhanced domains. The destruction of these domains by dislocation planar slip is observed after ex situ and in situ TEM mechanical testing. These results confirm the impact of SRO in Ti-Al alloys on the scale of angstroms. The direct confirmation of SRO in relationship to dislocation plasticity in metals can provide insight into how the mechanical behavior of concentrated solid solutions by the material’s thermal history.},
doi = {10.1126/sciadv.aax2799},
journal = {Science Advances},
number = 12,
volume = 5,
place = {United States},
year = {2019},
month = {12}
}

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