A calorimetric study of precipitation in commercial aluminium alloy 6061

Dutta, I.; Allen, Samuel M.

doi:10.1007/bf00719697

Cited by 352 publications

(227 citation statements)

References 14 publications

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“…[15], an A 0 c -value close to 3 kJ/mol is obtained for a typical Al-Mg-Si alloy containing about 0.60 wt pct Mg. This energy barrier is deemed to be representative of heterogeneous nucleation of coherent clusters at trapped vacancies during natural aging.…”

Section: B Determination Of Adjustable Parameters In Nucleation Lawsmentioning

confidence: 71%

“…[11][12][13][14][15][16][17][18][19] In the past, the relevant structure-property relationships have been captured mathematically in the combined precipitation, yield strength (YS), and work-hardening (WH) model being developed by two of the authors. [20][21][22] Later, it has been renamed the nanostructure model (NaMo) in order to reach out to a wider audience and make the work accessible to people with a background in finite element simulations and advanced structural analyses as well.…”

Section: Introductionmentioning

confidence: 99%

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An Extended Age-Hardening Model for Al-Mg-Si Alloys Incorporating the Room-Temperature Storage and Cold Deformation Process Stages

Myhr

Grong

Schäfer

2015

Metall Mater Trans A

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In this article, a new age-hardening model for Al-Mg-Si alloys is presented (named NaMo-Version 2), which takes into account the combined effect of cold deformation and prolonged room-temperature storage on the subsequent response to artificial aging. As a starting point, the original physical framework of NaMo-Version 1 is revived and used as a basis for the extension. This is permissible, since a more in-depth analysis of the underlying particle-dislocation interactions confirms previous expectations that the simplifying assumption of spherical precipitates is not crucial for the final outcome of the calculations, provided that the yield strength model is calibrated against experimental data. At the same time, the implementation of the Kampmann-Wagner formalism means that the different microstructure models can be linked together in a manner that enforces solute partitioning and competition between the different hardening phases which form during aging (e.g., clusters, b¢¢ and b¢). In a calibrated form, NaMo-Version 2 exhibits a high degree of predictive power, as documented by comparison with experiments, using both dedicated nanostructure and yield strength data as a basis for the validation. Hence, the model is deemed to be well-suited for simulation of thermomechanical processing of Al-Mg-Si alloys involving cold-working operations like sheet forming and stretch bending in combination with heat treatment and welding.

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Section: B Determination Of Adjustable Parameters In Nucleation Lawsmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

An Extended Age-Hardening Model for Al-Mg-Si Alloys Incorporating the Room-Temperature Storage and Cold Deformation Process Stages

Myhr

Grong

Schäfer

2015

Metall Mater Trans A

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“…A corresponding typical SAED pattern is presented in Figure 6b. 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].…”

Section: Properties and Microstructure Of The Ufg Alloy Processed Viamentioning

confidence: 99%

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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“…The Mg-rich alloy AA 6061 was first investigated by DSC by Dutta and Allen. [68] The thermograms show typical cluster formation peaks at %50-100 C and endothermic traces at %210 C due to cluster dissolution. Further clusters formed during NA generate a change in the following precipitation; a right shift of the β 00 peak to higher temperatures due to NA is observed.…”

Section: Differential Scanning Calorimetrymentioning

confidence: 96%

Clustering in Age‐Hardenable Aluminum Alloys

et al. 2018

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This review gives an overview of the effects of clusters in various aluminum alloys. Characterization methods are discussed in general and results for the important AlMgSi alloys are presented in detail. Indirect characterization methods, such as hardness, tensile testing, electrical resistivity, differential scanning calorimetry, and positron annihilation spectroscopy are discussed, as well as atom probe tomography for the direct measurement of clusters. A particular focus is set on atom probe tomography, where possible artifacts influencing the cluster measurements as well as different cluster finding methods are summed up. A comprehensive summary of investigated alloys and cluster algorithm parameters is given. Moreover, the findings in AlMgSi alloys regarding clusters and changes upon different heat treatments are discussed, starting from early to the latest works. Drawn conclusions are discussed and compared to give a r esum e.

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A calorimetric study of precipitation in commercial aluminium alloy 6061

Cited by 352 publications

References 14 publications

An Extended Age-Hardening Model for Al-Mg-Si Alloys Incorporating the Room-Temperature Storage and Cold Deformation Process Stages

An Extended Age-Hardening Model for Al-Mg-Si Alloys Incorporating the Room-Temperature Storage and Cold Deformation Process Stages

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

Clustering in Age‐Hardenable Aluminum Alloys

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