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

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.

doi:10.1126/sciadv.aax2799

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

Journal Article · 12 December 2019 · Science Advances

DOI: https://doi.org/10.1126/sciadv.aax2799 · OSTI ID:1591853

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^[2]; Deng, Yu ^[3]; Vachhani, Shraddha J. ^[4]; Ozdol, Burak ^[2];

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^[2]; Morris, J. W. ^[5];

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Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Nanjing Univ. (China)
Bruker Nano Surface, Minneapolis, MN (United States)
Univ. of California, Berkeley, CA (United States)

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1591853

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 12 Vol. 5; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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