Mechanisms of hydrogen embrittlement in high-strength aluminum alloys containing coherent or incoherent dispersoids

Safyari, Mahdieh; Moshtaghi, Masoud; Hojo, Tomohiko; Akiyama, Eiji

doi:10.1016/j.corsci.2021.109895

Cited by 55 publications

(22 citation statements)

References 102 publications

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“…According to this model, the dislocation loops may form around the non-coherent second phase particles (see also [ 51 , 52 , 53 , 54 , 55 ]). At the same time, it is worth noting that the negative values of the coefficient H v 0 for the UFG alloys with increased Sc content (see Figure 17 ) were unexpected since the nucleation of the Al 3 Sc particles was expected to result in an increase of H v 0 (see [ 50 , 55 ]). The analysis of the nature of this effect in the dynamic grain growth in the superplasticity conditions will be continued in our further studies.…”

Section: Resultsmentioning

confidence: 98%

“…The formation of the second phase (Al 3 Sc) particles at the grain boundaries would dampen the crossing of the grain boundaries by the dislocation bunches and make the functioning of the Frank–Reed source in the adjacent grains difficult. To explain this effect, the model described in [ 50 ] can be used also. According to this model, the dislocation loops may form around the non-coherent second phase particles (see also [ 51 , 52 , 53 , 54 , 55 ]).…”

Section: Resultsmentioning

confidence: 99%

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Investigation of Effect of Preliminary Annealing on Superplasticity of Ultrafine-Grained Conductor Aluminum Alloys Al-0.5%Mg-Sc

et al. 2021

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Effect of preliminary precipitation of Al3Sc particles on the characteristics of superplastic conductor Al-0.5%Mg-X%Sc (X = 0.2, 0.3, 0.4, 0.5 wt.%) alloys with ultrafine-grained (UFG) microstructure has been studied. The precipitation of the Al3Sc particles took place during long-time annealing of the alloys at 300 °C. The preliminary annealing was shown to affect the superplasticity characteristics of the UFG Al-0.5%Mg-X%Sc alloys (the elongation to failure, yield stress, dynamic grain growth rate) weakly but to promote more intensive pore formation and to reduce the volume fraction of the recrystallized microstructure in the deformed and non-deformed parts of the aluminum alloy specimens. The dynamic grain growth was shown to go in the deformed specimen material nonuniformly–the maximum volume fraction of the recrystallized microstructure was observed in the regions of the localization of plastic deformation.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Investigation of Effect of Preliminary Annealing on Superplasticity of Ultrafine-Grained Conductor Aluminum Alloys Al-0.5%Mg-Sc

et al. 2021

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“…There have been some reports about the theoretical structure of MXenes or experimentally characterizing the atomic structure of MXenes by physical method [ 1 , 4 , 5 , 7 , 8 , 9 , 10 , 17 , 19 , 21 , 22 ]. High resolution transmission electron microscope (HRTEM) was usually used to characterize the atomic structure of MXenes from a certain atomic plane [ 7 , 19 , 25 , 26 , 27 ]. However, it is still hard to differentiate the exact element and atom site of surface functional groups from TEM results yet.…”

Section: Introductionmentioning

confidence: 99%

Characterizing the Chemical Structure of Ti3C2Tx MXene by Angle-Resolved XPS Combined with Argon Ion Etching

Liu

2022

Materials

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Angle-resolved XPS combined with argon ion etching was used to characterize the surface functional groups and the chemical structure of Ti3C2Tx MXene. Survey scanning obtained on the sample surface showed that the sample mainly contains C, O, Ti and F elements, and a little Al element. Analyzing the angle-resolved narrow scanning of these elements indicated that a layer of C and O atoms was adsorbed on the top surface of the sample, and there were many O or F related Ti bonds except Ti–C bond. XPS results obtained after argon ion etching indicated staggered distribution between C–Ti–C bond and O–Ti–C, F–Ti bond. It is confirmed that Ti atoms and C atoms were at the center layer of Ti3C2Tx MXene, while O atoms and F atoms were located at both the upper and lower surface of Ti3C2 layer acting as surface functional groups. The surface functional groups on the Ti3C2 layer were determined to include O2−, OH−, F− and O−–F−, among which F atoms could also desorb from Ti3C2Tx MXene easily. The schematic atomic structure of Ti3C2Tx MXene was derived from the analysis of XPS results, being consistent with theoretical chemical structure and other experimental reports. The results showed that angle-resolved XPS combing with argon ion etching is a good way to analysis 2D thin layer materials.

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“…The tensile yield strength can be expressed using the “composite” Hall–Petch relationship as given below [ 46 ]:

where

is the resistance to dislocation glide within the crystallite for pure Al, which was reported to be about 10 MPa [ 47 ];

is the solution strengthening caused by dissolved solute atoms;

is the particle strengthening; and

and

are attributed to dislocation strengthening. Among these factors,

is a similar value in all specimens for the reason that the specimens contained the same concentration of elements and were also subjected to the same solution treatment to dissolve the majority of soluble phases.…”

Section: Resultsmentioning

confidence: 99%

Modulation of Multiple Precipitates for High Strength and Ductility in Al-Cu-Mn Alloy

Liu

Wang

et al. 2021

Materials

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The category and morphology of precipitates are essential factors in determining the mechanical behaviors of aluminum alloys. It is a great challenge to synthetically modulate multiple precipitates to simultaneously improve strength and ductility. In the present work, by optimizing the precipitations of the GP zone, θ’-approximant and θ’ phase for an Al-Cu-Mn alloy, a high tensile strength of 585 MPa with large elongation of 12.35% was achieved through pre-deformation and aging. The microstructure evolution pattern was revealed by detailed characterizations of scanning electron microscopy and transmission electron microscopy. It was found that such high tensile strength of the samples was due to a combination of strengthening by the high density of dispersive fine precipitates and dislocations, and the high elongation to failure was primarily attributed to the multimodal precipitates and elimination of precipitation-free zones along the grain boundaries. The strategy proposed here is a promising way of preparing ultra-strong Al-Cu-Mn alloys.

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Mechanisms of hydrogen embrittlement in high-strength aluminum alloys containing coherent or incoherent dispersoids

Cited by 55 publications

References 102 publications

Investigation of Effect of Preliminary Annealing on Superplasticity of Ultrafine-Grained Conductor Aluminum Alloys Al-0.5%Mg-Sc

Investigation of Effect of Preliminary Annealing on Superplasticity of Ultrafine-Grained Conductor Aluminum Alloys Al-0.5%Mg-Sc

Characterizing the Chemical Structure of Ti3C2Tx MXene by Angle-Resolved XPS Combined with Argon Ion Etching

Modulation of Multiple Precipitates for High Strength and Ductility in Al-Cu-Mn Alloy

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