Correlation between the microstructural evolution of a 6061 aluminium alloy and the evolution of its thermoelectric power

Massardier, V.; Épicier, Thierry; Merle, P.

doi:10.1016/s1359-6454(00)00085-9

Cited by 43 publications

(29 citation statements)

References 8 publications

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“…First, the solubility product parameter can be obtained assuming (i) the precipitate volume fraction f v is about 1.6% for the temperature corresponding to T6 treatment (448 K); and (ii) total dissolution of precipitates at 738 K, as shown experimentally by Massardier et al [31] and confirmed by the first-principles computation of Zhang et al [32]. These conditions lead to A = 30,750 K and B = À 16.3.…”

Section: Calibration Of the Precipitation Modelmentioning

confidence: 91%

Coupled precipitation and yield strength modelling for non-isothermal treatments of a 6061 aluminium alloy

et al. 2014

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In age-hardening alloys, high-temperature processes, such as welding, can strongly modify the precipitation state, and thus degrade the associated mechanical properties. The aim of this paper is to present a coupled approach able to describe precipitation and associated yield stresses for non-isothermal treatments of a 6061 aluminium alloy. The precipitation state (in terms of volume fraction and precipitate size distribution) is modelled thanks to a recent implementation of the classical nucleation and growth theories for needle-shaped precipitates. The precipitation model is validated through small-angle neutron scattering and transmission electron microscopy experiments. The precipitation size distribution is then used as an entry parameter of a micromechanical model for the yield strength of the alloy. Predicted yield stresses are compared to tensile tests performed with various heating conditions, representative of the heat-affected zone of a welded joint.

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Section: Calibration Of the Precipitation Modelmentioning

confidence: 91%

Coupled precipitation and yield strength modelling for non-isothermal treatments of a 6061 aluminium alloy

et al. 2014

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“…However, during MA the density of lattice defects and imperfections inevitably aggravates. Thus, electrical resistivity is naturally expected to increase progressively during the process [30,31].…”

Section: Electrical Resistivitymentioning

confidence: 99%

“…Although a detailed picture of the operating microstructural mechanisms are said to be still ambiguous, increase in resistivity is mostly attributed to the formation of non-random precipitates [30,31]. The maximum value occurs, when the zone reaches a critical size equal to the wave length of the conducting electrons.…”

Section: Electrical Resistivitymentioning

confidence: 99%

“…Presumably, rather than the size and spacing of distinctive precipitates [19], the dimension of the non-random Al 4 C 3 clusters and the spacing between them govern the electrical resistivity. Similar to age hardening Al alloys, they may involve in scattering and interfere with the mean free path of the electrons running in [30,31].…”

Section: Electrical Resistivitymentioning

confidence: 99%

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Microstructure and electrical resistivity features in Al-Al4C3 in-situ composite after attrition milling and double sequence of compaction and high temperature treatment

Özdemir¹,

Bostan²

2012

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An Al-based composite powder (Al-2%C) was prepared by mechanical alloying (MA). Mixed powders were cold compacted and annealed using two consecutive treatments. Microstructure progresses in both; the as-milled and the as-pressed and annealed conditions were characterized by X-ray diffractometry (XRD) and transmission electron microscopy (TEM). During MA, C diffused into Al to form a solid solution. However, for MA, primary compaction and 1 h sintering at 650• C was insufficient to synthesize Al with C. Only after secondary pressing and long-time annealing at 550• C, fine precipitates of Al4C3 were formed throughout the matrix. Increase in Al4C3 dispersion and stabilization of a dense dislocation substructure was the main source of systematic rise in both electric resistivity and hardness.K e y w o r d s : mechanical alloying, synthesizing, Al4C3 precipitation, electrical resistivity

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“…Al-Mg-Si alloys are medium strength structural alloys that exhibit good weldability, corrosion resistance and high damage tolerance. They represent the majority of the extruded Al alloys [1][2][3]. In order to optimize the microstructure of Al-Mg-Si ingots prior to their extrusion, it is necessary to understand the high-temperature precipitation of these alloys during cooling from the solutionizing temperature [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Correlative study of the thermoelectric power, electrical resistivity and different precipitates of Al–1.12Mg2Si–0.35Si (mass%) alloy

Zeid

Gaffar

Gaber

et al. 2015

J Therm Anal Calorim

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Characterization of the different precipitates developed in supersaturated Al-1.12Mg 2 Si-0.35Si (mass%) alloy by thermoelectric power (TEP) and electrical resistivity (ER) measurements was considered. The effect of precipitation of coherent, semi-coherent and noncoherent phases on the TEP was found impressive in describing different precipitates. Upon growing and coherency loss of b 0 particles, the TEP increases to reach a maximum value. TEP begins to approach a stable value by the formation of the equilibrium b (Mg 2 Si) precipitates and then stabilizes with the complete growth of more stable precipitates b phase and Si particles. The first-order coefficient a of the ER-temperature dependence was found dominating in the temperature range 300-635 K. Above this temperature range, the second-order coefficient b starts sharing effectively the resistivity-temperature dependence. Furthermore, it has been shown that the range of temperature in which the first-order coefficient a is dominating slightly increases after slow cooling twice to the room temperature in two successive runs. Correlation of a and b with the lattice rigidity of the alloy under investigation was established. Quenching and slow cooling affect strongly the observed correlation. All measurements in the present investigation were taken under non-isothermal conditions.

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Correlation between the microstructural evolution of a 6061 aluminium alloy and the evolution of its thermoelectric power

Cited by 43 publications

References 8 publications

Coupled precipitation and yield strength modelling for non-isothermal treatments of a 6061 aluminium alloy

Coupled precipitation and yield strength modelling for non-isothermal treatments of a 6061 aluminium alloy

Microstructure and electrical resistivity features in Al-Al4C3 in-situ composite after attrition milling and double sequence of compaction and high temperature treatment

Correlative study of the thermoelectric power, electrical resistivity and different precipitates of Al–1.12Mg2Si–0.35Si (mass%) alloy

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