Crystal structure of the orthorhombic U2-Al4Mg4Si4 precipitate in the Al–Mg–Si alloy system and its relation to the β′ and β″ phases

Andersen, Sigmund Jarle; Marioara, Calin Daniel; Frøseth, A. G.; Vissers, R.; Zandbergen, H.W.

doi:10.1016/j.msea.2004.09.019

Cited by 191 publications

(98 citation statements)

References 22 publications

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“…A similar distribution of metastable phase precipitates was observed in a number of UFG Al-Mg-Si alloys after AA [19,[21][22][23]42]. It is necessary to note that both the current study and the previous research point to the fact that the morphology of metastable phase precipitates in UFG alloys is similar to that of CG counterparts processed by conventional techniques [9][10][11][12][13][14]. The absence of metastable β′′-phase precipitates in the UFG alloy after AA found earlier in Al-Mg-Si alloys after SPD treatment [19,21,22,42] can be explained by the higher aging temperature used to process billets.…”

Section: Properties and Microstructure Of The Ufg Alloy Processed Viasupporting

confidence: 78%

“…Symmetrical streaks between the diffraction spots of [001] Al are related to HCP β′-precipitates [51,52]. Their morphology and location are typical of coarse-grained alloys of the Al-Mg-Si system processed by quenching and further АА [9][10][11][12][13]. Precipitates of the same morphology were observed after AA in UFG Al-Mg-Si alloys processed via ECAP-PC [19,22,42] and НРТ [23].…”

Section: Properties and Microstructure Of The Ufg Alloy Processed Viamentioning

confidence: 99%

“…Additionally, nanoscale spherical metastable β′-second-phase precipitates were formed in the Al matrix during ECAP-C. Their morphological features are typical for Al alloys, since the formation of ultrafine grains in these alloys is accompanied by the decomposition of solid solution and the formation of strengthening Mg2Si phases [19][20][21][22][23][24][41][42][43][44][45][46]. Their spherical shape is different from the shape of β′-phase (in the form of spheres) formed as a result of a conventional thermal (of Т6 type) and/or thermomechanical treatment (of Т81 type) of CG counterparts [9][10][11][12][13][14]. The observed differences are determined by a considerable dislocation activity and the increase in vacancy concentration during SPD (ECAP-C in our case).…”

Section: Properties and Microstructure Of The Ufg Alloy Processed Viamentioning

confidence: 99%

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Enhanced Mechanical Properties and Electrical Conductivity in Ultrafine-Grained Al 6101 Alloy Processed via ECAP-Conform

Murashkin

Medvedev

Kazykhanov

et al. 2015

Metals

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This paper studies the effect of equal channel angular pressing-Conform (ECAP-C) and further artificial aging (AA) on microstructure, mechanical, and electrical properties of Al 6101 alloy. As is shown, ECAP-C at 130 °C with six cycles resulted in the formation of an ultrafine-grained (UFG) structure with a grain size of 400-600 nm containing nanoscale spherical metastable β′ and stable β second-phase precipitates. As a result, processed wire rods demonstrated the ultimate tensile strength (UTS) of 308 MPa and electrical conductivity of 53.1% IACS. Electrical conductivity can be increased without any notable degradation in mechanical strength of the UFG alloy by further AA at 170 °C and considerably enhanced by additional decomposition of solid solution accompanied by the formation of rod-shaped metastable β′ precipitates mainly in the ultrafine grain interior and by the decrease of the alloying element content in the Al matrix. It is demonstrated that ECAP-C can be used to process Al-Mg-Si wire rods with the specified UFG microstructure. The mechanical strength and electrical conductivity in this case are shown to be much higher than those in the industrial semi-finished products made of similar material processed by the conventional T6 or T81 treatment. OPEN ACCESSMetals 2015, 5 2149

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Section: Properties and Microstructure Of The Ufg Alloy Processed Viasupporting

confidence: 78%

Section: Properties and Microstructure Of The Ufg Alloy Processed Viamentioning

confidence: 99%

Section: Properties and Microstructure Of The Ufg Alloy Processed Viamentioning

confidence: 99%

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Enhanced Mechanical Properties and Electrical Conductivity in Ultrafine-Grained Al 6101 Alloy Processed via ECAP-Conform

Murashkin

Medvedev

Kazykhanov

et al. 2015

Metals

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“…The metastable precipitates form as a consequence of precipitation which is controlled by the alloy composition and thermo-mechanical history. The precipitation sequence of the Al-MgSi alloys is as follows: [1][2][3][4][5][6][7][8]:…”

Section: Al-mg-si Alloysmentioning

confidence: 99%

The effect of Zn on precipitation in Al–Mg–Si alloys

Saito

Wenner

Osmundsen

et al. 2014

Philosophical Magazine

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“…[5] summarised observed phases in each kind of alloy. The proposed sequences are shown in the table 1. β" phase is coherent phase, with composition accepted to be Mg 5 Si 7 [6,9,11,13,16] [5,8,11,12]. This ambiguity may be however caused by constant migration of atoms in the elevated temperature.…”

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confidence: 99%

Influence of Age Hardening Parameters on the Microstructure and Properties of the AlSi7Mg Sand Cast Alloy / Wpływ Parametrów Utwardzania Wydzieleniowego Na Strukturę I W Łaściwości Stopu Alsi7mg

Poloczek¹,

Dybowski²,

Rodak³

et al. 2015

Archives of Metallurgy and Materials

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Aluminium alloys are characterized by a low density, acceptable mechanical properties and good technological properties. This unique connection of features made aluminium alloys perfect structural material for the transportation industry. Also, due to their good electrical conductivity they also found application in energy production industry. High mechanical properties and electrical conductivity of the Al-Si alloys with Mg addition may be achieved by heat treatment. However, the highest mechanical properties are achieved in the early stages of age hardening - due to precipitation of coherent phases, while high electrical conductivity may be achieved only by prolonged aging, during precipitation of semi-coherent or fully noncoherent, coarse phases. Carefully heat treated AlSi7Mg alloy may exhibit both fairly high electrical conductivity and slightly increased mechanical properties. The following article present results of the research of influence of heat treatment on the properties and microstructure of sand cast AlSi7Mg alloy. Microstructure observations were performed using light microscopy, scanning electron and scanning-transmission electron microscopy. Hardness and electrical conductivity of the AlSi7Mg alloy were investigated both in as-cast condition and after heat treatment. Maximum hardness of the alloy is achieved after solutioning at 540°C for 8h, followed by 72h of aging at 150°C, while maximal electrical conductivity after solutioning at 540°C for 48h, followed by 96h of aging at 180°C. Increase of the electrical conductivity is attributed to increasing distance between Si crystals and precipitation of semi coherent phases.

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Crystal structure of the orthorhombic U2-Al4Mg4Si4 precipitate in the Al–Mg–Si alloy system and its relation to the β′ and β″ phases

Cited by 191 publications

References 22 publications

Enhanced Mechanical Properties and Electrical Conductivity in Ultrafine-Grained Al 6101 Alloy Processed via ECAP-Conform

Enhanced Mechanical Properties and Electrical Conductivity in Ultrafine-Grained Al 6101 Alloy Processed via ECAP-Conform

The effect of Zn on precipitation in Al–Mg–Si alloys

Influence of Age Hardening Parameters on the Microstructure and Properties of the AlSi7Mg Sand Cast Alloy / Wpływ Parametrów Utwardzania Wydzieleniowego Na Strukturę I W Łaściwości Stopu Alsi7mg

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