APFIM investigation of fine-scale precipitation in aluminium alloy 6061

Edwards, Geoffrey A.; Stiller, Krystyna Marta; Dunlop, G. L.

doi:10.1016/0169-4332(94)90346-8

Cited by 62 publications

(27 citation statements)

References 8 publications

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“…It is generally acknowledged that full optimization of materials properties requires that precipitate structures and compositions be clarified, including correlations between number densities and heat treatment. For the Al-Mg-Si alloy, the main hardening phase is the fully coherent needle-shaped β'' [5,6]. The structure of this precipitate was clarified originally by Zandbergen et al [7,8], though some debate remains as to the β'' composition [9,3].…”

Section: Introductionmentioning

confidence: 99%

Ab initio interface configuration determination for β″ in Al–Mg–Si: Beyond the constraint of a preserved precipitate stoichiometry

Ehlers¹

2014

Computational Materials Science

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The precipitate-host lattice interface configuration stabilities for the β'' phase in the Al-MgSi alloy system have been examined using density functional theory. Usually, the supercell based calculations underlying such studies assume a preserved precipitate stoichiometry. Relaxing this assumption in the present work, we highlight significant results that may easily be overlooked when the stoichiometry constraint is operative. Our main findings are the following: (i) we reject the often proposed Mg5Si6 composition for β''. (ii) We stress the possibility of significant Mg-Al compositional disorder for the more likely β''-Mg5Al2Si4. Finally, (iii) we propose the existence of more than one locally stable interface configuration for the coherent β''/Al interfaces. It is argued that quantifying the solute atom diffusivity near the interface as well as within β'' is fundamental to addressing the importance of points (ii) and (iii).

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Section: Introductionmentioning

confidence: 99%

Ab initio interface configuration determination for β″ in Al–Mg–Si: Beyond the constraint of a preserved precipitate stoichiometry

Ehlers¹

2014

Computational Materials Science

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“…The endothermic peak II is caused by dissolution of pre-formed nanoclusters in the Al matrix. Edward et al 1,18) and Dutta et al 19) also reported the existence of nanoclusters by means of DSC and atom probe field ion microscopy (APFIM). The exothermic reactions corresponding to peak III, IV and V are attributed to the precipitation of the needlelike ¢AA, rod-like ¢A and equilibrium ¢-(Mg 2 Si) phases.…”

Section: Resultsmentioning

confidence: 99%

Influence of Mg/Si Ratio on Nanocluster Formation in Al-Mg-Si Alloys with Constant Mg + Si Concentration

Kim

Kobayashi

et al. 2014

Mater. Trans.

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Two types of nanoclusters are formed during low temperature aging and play significantly important roles in age-hardening of Al-Mg-Si alloys. The formation behavior of nanoclusters markedly depends on the alloy composition. In this paper, alloy specimens with different Mg/Si ratios in the constant Mg + Si concentration of 1.1, 1.3 and 1.5 mol% were used in order to investigate the influence of the Mg/Si ratio on the nanocluster formation using differential scanning calorimetry (DSC), hardness and electrical resistivity measurements. Two overlapped peaks obtained by the DSC analysis are separated using the Gaussian function method and it is clarified that the volume fraction and formation kinetics of nanoclusters change with the Mg/Si ratio even though in the constant Mg + Si concentration. It is found that the most favorable Mg/Si ratio for the nanocluster formation is almost 1.0 even for the different values of the Mg + Si concentration. The influence of the Mg/Si ratio on the nanocluster formation is discussed in terms of interactions among the solute Mg and Si atoms and vacancies in the matrix.

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“…At the same time, the structure ofˇ0 0 described above does not correspond very well to the studies ofˇ0 0 performed by atom-probe reported in the literature. 2,9,13,14 These studies have concluded that the Mg/Si ratio of clusters, GP-zones andˇ0 0 are all almost equal to 1 for Si-rich alloys. Theˇ0 0 Mg level is measured as being slightly higher than the Si level in two of these studies, 9,14 and it is also suggested that the Mg/Si ratio stays close to the alloy composition for Mg-rich alloys.…”

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confidence: 95%

Comparative study of the β″‐phase in a 6xxx Al alloy by 3DAP and HRTEM

Hasting

Lefebvre

Marioara

et al. 2007

Surface & Interface Analysis

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The metastable b -hardening phase in aged 6xxx-series Al alloys has been investigated by threedimensional atom-probe in order to evaluate the composition (Mg 5 Si 6 ) of the structure, previously determined by high-resolution transmission electron microscopy (HRTEM) and electron diffraction. For b , a significant number of Mg and Si atoms are found to be lost during detection in atom-probe analysis. The reason of this is non-resolved events, in which the correlation between the time-of-flight (TOF) and the detected position of the field-evaporated ion is lost. The problem is attributed to uneven evaporation and can be avoided by the use of an advanced delay-line detector (ADLD), which is capable of discriminating extremely closely spaced detection events. Preliminary analysis of a b -particle using this detector gave a Mg/Si ratio of 0.9 and a composition of 15 at.% Al. The Al level is significantly lower than those previously measured by other atom-probe detectors, because of the higher efficiency of the ADLD in detecting Mg and Si in particles. Atom-probe analysis with the ADLD detector is consistent with the b Mg/Si ratio derived from electron microscopy analysis. The measurements indicate that Al atoms may substitute both Si and Mg positions.

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APFIM investigation of fine-scale precipitation in aluminium alloy 6061

Cited by 62 publications

References 8 publications

Ab initio interface configuration determination for β″ in Al–Mg–Si: Beyond the constraint of a preserved precipitate stoichiometry

Ab initio interface configuration determination for β″ in Al–Mg–Si: Beyond the constraint of a preserved precipitate stoichiometry

Influence of Mg/Si Ratio on Nanocluster Formation in Al-Mg-Si Alloys with Constant Mg + Si Concentration

Comparative study of the β″‐phase in a 6xxx Al alloy by 3DAP and HRTEM

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