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, D. C.; Asta, Mark; Minor, Andrew M.

doi:10.1126/sciadv.aax2799

Cited by 108 publications

(49 citation statements)

References 44 publications

(62 reference statements)

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“…In Ti-Al alloys, the aluminum solutes are substitutional, and therefore the leading dislocation results in a disruption of SRO and successive dislocation motion on a "softened" glide plane. This theory is corroborated via indirect evidence, such as leading dislocations pairs resulting from the creation of a diffuse antiphase boundary (DAPB) (16)(17)(18) as well as direct characterization of the SRO structures using neutron diffraction (19) and energy-filtered transmission electron microscopy (TEM) (20). Analogously, it has been hypothesized that the formation of SRO in Ti-O alloys could be responsible for the propensity of planar dislocation slip at higher oxygen concentrations (9).…”

Section: Introductionmentioning

confidence: 85%

“…This is in sharp contrast to the temperature and strain rate dependences of planar slip we found in Ti-O alloys. It is also worth noting that the SRO-induced planar slip would usually leave a residual strain field caused by the destruction of SRO on the glide plane (18,20). No similar observation has ever been reported in Ti-O alloys.…”

Section: Dislocation Activity: Wavy Slip Versus Planar Slipmentioning

confidence: 97%

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Mechanistic basis of oxygen sensitivity in titanium

Poschmann

Zhang

et al. 2020

Sci. Adv.

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One of the most potent examples of interstitial solute strengthening in metal alloys is the extreme sensitivity of titanium to small amounts of oxygen. Unfortunately, these small amounts of oxygen also lead to a markedly decreased ductility, which in turn drives the increased cost to purify titanium to avoid this oxygen poisoning effect. Here, we report a systematic study on the oxygen sensitivity of titanium that provides a clear mechanistic view of how oxygen impurities affect the mechanical properties of titanium. The increased slip planarity of Ti-O alloys is caused by an interstitial shuffling mechanism, which is sensitive to temperature, strain rate, and oxygen content and leads to the subsequent alteration of deformation twinning behavior. The insights from our experimental and computational work provide a rationale for the design of titanium alloys with increased tolerance to variations in interstitial content, with notable implications for more widespread use of titanium alloys.

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Section: Introductionmentioning

confidence: 85%

Section: Dislocation Activity: Wavy Slip Versus Planar Slipmentioning

confidence: 97%

Mechanistic basis of oxygen sensitivity in titanium

Poschmann

Zhang

et al. 2020

Sci. Adv.

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“…Microscopically, we used a state-of-the-art four-dimensional (4D)-STEM technique [43][44][45][46] to observe the detailed structure and local strain behavior in the 15-HEA nanoparticles. In 4D-STEM, an electron probe is rastered across a selected region of interest (two-dimensional [2D] real space), and at each probe position a diffraction pattern is acquired (2D reciprocal space).…”

Section: Detailed Characterization Of Entropy-stabilized Nanoalloysmentioning

confidence: 99%

Extreme mixing in nanoscale transition metal alloys

Yao

Huang²,

Hughes³

et al. 2021

Matter

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133

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Conventionally, alloys are mostly synthesized in the region of easy mixing, i.e., with light immiscibility and oxidation potentials. Yet such a limited elemental combination largely hinders possible tunability and material discovery. By using entropic design (high temperature and high entropy) that favors uniform mixing, we extended nanoscale alloying to previous unmixable regions by including strongly immiscible and easily oxidized combinations, which we called an extreme mixing. The new alloy space could bring forth exotic nanomaterials for broad applications.

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“…In this work, Ti-Al alloys was selected with the purpose of observing dislocation motion change and the protentional directional effect due to applied current. Titanium alloys are widely used as structural materials due to their high specific strength and excellent corrosion resistance, especially with Al as a solid solution strengthener [4]. The chemical short-range ordering (SRO) of Al atoms were directly observed by Zhang et al together with their strain distribution and the "wavy to planar" slip transition, which could potentially confine the dislocation motion and easier for observation [5].…”

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confidence: 99%