Precipitate Characterization in Model Al-Zn-Mg-(Cu) Alloys Using Small-Angle X-ray Scattering

Freiberg, Daniel; Zhu, Wenhui; Park, Jun-Sang; Almer, Jonathan; Sanders, Paul G.

doi:10.3390/met10070959

Cited by 8 publications

(2 citation statements)

References 16 publications

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“…Two characteristic humps are observed in the intermediate and large q -range, respectively. The hump at a large q with a maximum at about 2 nm −1 is interpreted to stem from Zn-rich GP-zones [ 21 , 34 , 35 ]. This scattering feature is well-separated from the rest of the curve, since the GP-zones are very small (a few nanometers only).…”

Section: Resultsmentioning

confidence: 99%

Characterization of Zr-Containing Dispersoids in Al–Zn–Mg–Cu Alloys by Small-Angle Scattering

Honaramooz

Morak²,

Pogatscher

et al. 2023

Materials

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The characterization of Zr-containing dispersoids in aluminum alloys is challenging due to their broad size distribution, low volume fraction, and heterogeneous distribution within the grains. In this work, small-angle X-ray scattering (SAXS) and small-angle neutron scattering (SANS) were compared to scanning electron microscopy (SEM) and transmission electron microscopy (TEM) regarding their capability to characterize Zr-containing dispersoids in aluminum alloys. It was demonstrated that both scattering techniques are suitable tools to characterize dispersoids in a multi-phase industrial 7xxx series aluminum alloy. While SAXS is more sensitive than SANS due to the high electron density of Zr-containing dispersoids, SANS has the advantage of being able to probe a much larger sample volume. The combination of both scattering techniques allows for the verification that the contribution from dispersoids can be separated from that of other precipitate phases such as the S-phase or GP-zones. The size distributions obtained from SAXS, SANS and TEM showed good agreement. The SEM-derived size distributions were, however, found to significantly deviate from those of the other techniques, which can be explained by considering the resolution-limited restrictions of the different techniques.

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Section: Resultsmentioning

confidence: 99%

Characterization of Zr-Containing Dispersoids in Al–Zn–Mg–Cu Alloys by Small-Angle Scattering

Honaramooz

Morak²,

Pogatscher

et al. 2023

Materials

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“…The solid solution state of supersaturated aluminum alloys (such as 7055 Al alloy) is unstable. The decomposition of supersaturated solid solution, and desolvation of solute atoms, can be caused by aging treatment or deformation under solution temperature, thus affecting the morphology, distribution, and density of precipitates [26].…”

Section: Evolution Of Microstructures During Tmpsmentioning

confidence: 99%

Effect of Deformation on Precipitation and the Microstructure Evolution during Multistep Thermomechanical Processing of Al-Zn-Mg-Cu Alloy

Zuo

Hou

Shu

et al. 2020

Metals

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In order to obtain fine grained structure efficiently, a new multi-step rolling process (MSR: pre-deformation + intermediate annealing + hot deformation) was applied in Al-Zn-Mg-Cu plates. Conventional hot rolling (CHR) was also carried out as a contrast experiment. The evolution of microstructures and improvement of mechanical properties were analyzed by optical microscope, scanning electron microscope, transmission electron microscope, X-ray diffractometer, and tensile tests. The results show that the MSR process can obtain finer longitudinal grain size and better mechanical properties than CHR, which can be explained as follows: spheroidization of precipitates wrapped by high density dislocations could be promoted by increased pre-deformation; numerous ordered substructures were formed during short-period intermediate annealing at high temperature; in the subsequent hot rolling process, the retained spherical precipitates pinned dislocations and boundaries. With the increase of accumulated strain, low angle grain boundaries gradually transformed into high angle grain boundaries, leading to grain refinement. With the increased pre-deformation (MSR1 20 + 60%, MSR2 40 + 40%, MSR3 60 + 20%), the effect of grain refinement and plasticity improvement gradually weakened. The optimum thermomechanical process (MSR1 solid solution + pre-deformation (300 °C/20%) + intermediate annealing (430 °C/5 min) + hot deformation (400 °C/60%)) was obtained, which can increase elongation by ~25% compared with the CHR process, while maintaining similar high strength for reduced longitudinal grain size.

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Quantification of precipitate evolution in cast Al–Li alloys containing Cu and Mg additions using small-angle X-ray scattering

Song,

Li,

Zhao

et al. 2024

Journal of Materials Research and Technology

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Precipitate Characterization in Model Al-Zn-Mg-(Cu) Alloys Using Small-Angle X-ray Scattering

Cited by 8 publications

References 16 publications

Characterization of Zr-Containing Dispersoids in Al–Zn–Mg–Cu Alloys by Small-Angle Scattering

Characterization of Zr-Containing Dispersoids in Al–Zn–Mg–Cu Alloys by Small-Angle Scattering

Effect of Deformation on Precipitation and the Microstructure Evolution during Multistep Thermomechanical Processing of Al-Zn-Mg-Cu Alloy

Quantification of precipitate evolution in cast Al–Li alloys containing Cu and Mg additions using small-angle X-ray scattering

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