Precipitate/matrix incompatibilities related to the {111}Al Ω plates in an Al-Cu-Mg-Ag alloy

Газизов, М. Б.; Boev, A.O.; Marioara, Calin Daniel; Holmestad, Randi; Aksyonov, Dmitry A.; Gazizova, M. Yu.; Kaibyshev, Rustam

doi:10.1016/j.matchar.2021.111586

Cited by 15 publications

(21 citation statements)

References 37 publications

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“…We confirmed in our recent work that there are structural and volumetric incompatibilities between the Al matrix and Ω plates [19,31]. Structural incompatibilities associated with the appearance of two shear components: [− 101] Al // [0− 10] θ (τ I ) and [1− 21] Al // [100] θ (τ II ) can be along the broad interfaces of the plates with different thicknesses.…”

Section: Introductionsupporting

confidence: 83%

“…The samples were then solution heat treated at 510 • C for 1 h and quenched in water. Aging at 150 • C for 24 h and 190 • C for 1.5 h was carried out to provide peak-hardness state in the respective alloy [19,31].…”

Section: Methodsmentioning

confidence: 99%

“…TEM foils were prepared similarly as in [19,31] by electropolishing the ~150 μm thick samples using a solution of 2/3 methanol and 1/3 nitric acid at − 30 • C. Foils were studied in two microscopes operated at 200 kV: a JEOL JEM-2100F and a double aberration corrected JEOL ARM-200F. The latter was equipped with a JEOL annular dark field (ADF) detector used in scanning mode [31]. A spot size of 0.08 nm, 27 mrad convergence semi-angle and collection semi-angles of 35-149 mrad were used as ADF-STEM presets.…”

Section: Methodsmentioning

confidence: 99%

“…Analysis of the atomic column arrangements performed in [19,31] showed that Ω plates are constructed from the broad interfaces and 'building blocks' based on an orthorhombic structure closely linked to the equilibrium θ-phase (Al 2 Cu, I4/mcm) typical for the Ω phase [7,8,[11][12][13][14]. Thus, the plate thicknesses (t) analyzed in the present work varied between 0 and 2 c θ with the step of 0.5 c θ in [111] Al //[001] θ .…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Edge interfaces of the Ω plates in a peak-aged Al-Cu-Mg-Ag alloy

Газизов

Boev

Marioara

et al. 2022

Materials Characterization

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Section: Introductionsupporting

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Edge interfaces of the Ω plates in a peak-aged Al-Cu-Mg-Ag alloy

Газизов

Boev

Marioara

et al. 2022

Materials Characterization

Self Cite

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“…Obviously, increasing the aging temperature could accelerate the diffusion of solute atoms and vacancies, which was more conducive to the nucleation of Ω phase. Third, there was a large mismatch between the Ω phase and the matrix in the direction perpendicular to {111} Al [39], resulting in a large phase transition resistance. Increasing the temperature could increase the driving force for the phase transformation and facilitate Ω phase precipitation from the matrix.…”

Section: The Effect Of the Pre-aging Temperature On The Precipitation...mentioning

confidence: 99%

Pre-Aging Effect on the Formation of Ω Phase and Mechanical Properties of the Al-Cu-Mg-Ag Alloy

Ying

Lin

Liu

et al. 2022

Metals

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In the present work, different aging treatments were performed to investigate the pre-aging effect on the formation of Ω phase and mechanical properties in Al-Cu-Mg-Ag alloy. The results showed that pre-strain could inhibit the formation of Ω phases, which was detrimental to the alloy strength. Due to the introduction of pre-aging treatment before pre-strain, the adverse effect of pre-strain on the precipitation of the Ω phase was reduced, and the alloy strength was increased by at least 15 MPa. Besides this, increasing the pre-aging temperature promoted the precipitation of Ω phases, inhibited the formation of θ′ phases, and improved the alloy strength. This was because the higher pre-aging temperature promoted more pre-precipitated Ω phases in the pre-aging process, and most of the pre-precipitated Ω phases could be retained and grew in the subsequent aging process. As a result, the tensile strength of the alloy increased from 523 MPa to 540 MPa. In addition, pre-aging with a higher temperature consumed more solute atoms, leading to less residual solute atoms in the matrix. Thus, the adverse effects of pre-strain, which inhibit the formation of clusters by the segregation of solute atoms, were reduced.

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