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

作者：Ruopeng Zhang, Shiteng Zhao, Colin Ophus, Yu Deng, Shraddha J. Vachhani, Burak Ozdol, Rachel Traylor, Karen C. Bustillo, John William Morris Jr., D. C. Chrzan, Mark Asta, Andrew M. Minor · 发表于：Science Advances · 年份：2019 · DOI：10.1126/sciadv.aax2799 · 被引用次数：143 · 研究领域：Metal and Thin Film Mechanics、Titanium Alloys Microstructure and Properties、Intermetallics and Advanced Alloy Properties

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.