Study of the Q′ (Q)-phase precipitation in Al–Mg–Si–Cu alloys by quantification of atomic-resolution transmission electron microscopy images and atom probe tomography

Ding, Lipeng; Orekhov, A. S.; Weng, Yaoyao; Jia, Zhihong; Idrissi, Hosni; Schryvers, D.; Muraishi, Shinji; Hao, Longlong; Liu, Qing

doi:10.1007/s10853-019-03427-6

Cited by 21 publications

(7 citation statements)

References 20 publications

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“…9 (b), one of the quaternary precipitate is seen edge-on, coprecipitated with a '-Al 2 Cu precipitate. In this orientation, by STEM-HAADF, the Q'(Q)-AlCuMgsi phase can be recognized by the Cu-rich columns (high intensity due to high atomic number) surrounded by lower intensity columns (Si, Al and Mg) similar to the cross-section structure viewed along < 100 > Al zone axis shown in Ding et al [30] .…”

Section: Artificial Aging Treatment At 180 °C and Identification Of Pmentioning

confidence: 63%

“…after 4 h at 260 °C. In a very recent paper, Ding et al [30] were able to provide, by combining atom probe tomography and atomic column intensity quantification in STEM-HAADF images, the reason why varying composition were reported in past work: it was indeed proved to be due to the occupancy change of the atomic columns. The stoichiometry of the Q phase and its precursor, the Q ' phase were found to be: Al 5 Cu 3 Si 6 Mg 9 and Al 12 Cu 1 Si 4 Mg 5 , respectively.…”

Section: Upon Artificial Aging -Identification Of Precipitationmentioning

confidence: 99%

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Precipitation in original Duralumin A-U4G versus modern 2017A alloy

et al. 2019

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Precipitation in Duralumin, a historic quaternary alloy of the type: Al-Cu-Mg-Si, was never fully studied nor observed by current electron microscopy techniques. This article presents the full characterization and comparison of two alloys: a Duralumin (A-U4G) from the 1950s collected on a vintage aircraft and its modern equivalent: a 2017A alloy. The as-received and peak-aging states were analysed with DSC, SAXS and TEM advanced techniques. It is shown that old Duralumin and modern 2017A present a similar nanoprecipitation in the as-received state and behave similarly upon artificial aging. As opposed to what has been reported in the past, three types of precipitates participating in hardening were found upon aging: '-Al 2 Cu, Q'(Q)-AlCuMgSi and Ω-Al 2 Cu.

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Section: Artificial Aging Treatment At 180 °C and Identification Of Pmentioning

confidence: 63%

Section: Upon Artificial Aging -Identification Of Precipitationmentioning

confidence: 99%

Precipitation in original Duralumin A-U4G versus modern 2017A alloy

et al. 2019

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“…When the Sn incorporated in the precipitate, the atomic structure of the β phase is broken. The effect of Cu addition on the atomic structure and formation enthalpies of precipitates for Al-Mg-Si alloys has been widely studied [29][30][31][32]. Cu atoms can replace the Al site of the β phase and form the 'Cu sub-unit cluster' (substructure of the Q' phase) [26].…”

Section: Dft Calculationmentioning

confidence: 99%

Effect of Cu/Sn additions on the precipitation and property in Al-Mg-Si alloys

Weng

Sun

Ding

et al. 2023

Materials Science and Technology

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The effects of Cu and Sn additions on the precipitation hardening of Al-Mg-Si alloys were systematically studied by performance testing and microscopic characterisation. Sn addition can retard the onset of natural aging (NA), while after long-term NA, the NA hardening is enhanced. Although Cu and Sn can promote the NA hardening, the Cu and Sn combination addition results in NA hardness lower than the individual Cu addition. Compared with Sn, Cu addition is more efficient in promoting the artificial aging hardening of these alloys. Both of the Sn and Cu atoms can incorporate in the interior of the β′′ phase and produce disordered structure. The results are expected to provide new insight for designing new aluminium alloys for automotive application.

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“…Abundant research has been conducted to clarify the precipitation behaviors of Al-Mg-Si(-Cu) alloys during age hardening, especially paint bake hardening, a typical heat treatment process for auto body panels [ 5 ], thus guiding the design of new generations of alloys. In these alloys, Cu additions have been found to induce the formation of Cu-containing nano-precipitates, such as Q [ 2 , 12 , 13 , 14 ] in the over-aged state, its precursor Q′ [ 7 , 15 , 16 , 17 , 18 ], C, S, L, QP [ 19 ], and QC [ 20 , 21 ], as well as β″-Al 2 Mg 5 Si 4 [ 22 ] with Cu substitutions [ 23 ] in the peak-aged state; meanwhile, the alloys are hardened to higher levels compared to Cu-free alloys with the same Mg and Si contents [ 12 ]. Similar results have also been reported in Al-Si-Cu-Mg alloys heat-treated after casting [ 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Behavior of Quaternary Eutectic α+θ+Q+Si Clusters in As-Cast Al-Mg-Si-Cu Alloys

Li,

Yu,

et al. 2023

Materials

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Cu additions notably strengthen Al-Mg-Si and Al-Si-Mg alloys due to the dense precipitation of quaternary nano precipitates during ageing. However, the chemical evolution and mechanical behaviors of the quaternary micro-scale Q constituent phase occurring in cast and homogenized states have rarely been studied. Meanwhile, there exists a type of AlCuMgSi cluster in the cast state, which has been regarded as Q particles. The accurate identification of phase constituents is the basis for the future design of alloys with better performance. In our work, this type of cluster was revealed to consist of α-Al, θ-Al2Cu, Q, and Si phases through micro-to-atomic scale studies using scanning and transmission electron microscopes. The skeleton of the dendrite was θ phase. The second phases in the dendritic eutectic cluster dissolved quickly during a 4 h homogenization at 550 °C. The Q phase was found to effectively absorb the Fe impurities during casting and homogenization. As a result, the formation of other harmful Fe-rich intermetallics was suppressed. These Q constituent particles were observed to break into separate pieces in an intermediately brittle manner when compressed in situ in a scanning electron microscope. These findings provide insights into the thermodynamic modeling of the Al-Mg-Si-Cu system and alloy design.

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Study of the Q′ (Q)-phase precipitation in Al–Mg–Si–Cu alloys by quantification of atomic-resolution transmission electron microscopy images and atom probe tomography

Cited by 21 publications

References 20 publications

Precipitation in original Duralumin A-U4G versus modern 2017A alloy

Precipitation in original Duralumin A-U4G versus modern 2017A alloy

Effect of Cu/Sn additions on the precipitation and property in Al-Mg-Si alloys

Microstructure and Mechanical Behavior of Quaternary Eutectic α+θ+Q+Si Clusters in As-Cast Al-Mg-Si-Cu Alloys

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