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

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

doi:10.1016/j.matchar.2022.111747

Cited by 16 publications

(2 citation statements)

References 35 publications

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“…Increasing the temperature could increase the driving force for the phase transformation and facilitate Ω phase precipitation from the matrix. Fourth, the formation of Ω phase required the diffusion of Cu atoms into Mg-Ag clusters [4,40,41]. Increasing the temperature could promote the migration rate of Cu atoms, which was also conducive to improving the nucleation rate of Ω phases.…”

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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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

View full text Add to dashboard Cite

show abstract

“…Knowles et al 48 checked the monoclinic structure constructed by Auld using HRTEM and showed that the monoclinic structure should actually be orthorhombic (space group Fmmm, a = 0.496 nm, b = 0.859 nm, c = 0.848 nm). The optimized orthorhombic structure is the currently widely accepted Ω phase structure 49,50 , and the orientation relationship of it with the aluminum matrix is However, Garg et al 53 reported that the symmetry of the Ω phase was tetragonal based on Convergent Beam Electron Diffraction (CBED), which differed from the structure proposed by Knowles et al 48 , but they did not deeply investigate the reasons behind this discrepancy. Recently, Yang et al 54 reported that the orthorhombic structure proposed by Knowles et al 48 is a variant of the tetragonal structure of θ-Al2Cu (space group I4/mcm, a = 0.607 nm, c = 0.487 nm) based on the results of Density Functional Theory (DFT) calculations.…”

Section: Precipitation Behavior Of Al-cu-mg-ag Alloymentioning

confidence: 99%