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Analysis of Chemical Composition Homogeneity in the Cross-section of the Rods Produced from Alloys of 6xxx Group

Maja Vončina
Maja Vončina
, 
Peter Cvahte
Peter Cvahte
, 
Ana Kračun
Ana Kračun
, 
Tilen Balaško
Tilen Balaško
 et 
Jožef Medved
Jožef Medved
   | 24 avr. 2020
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Article Category: Original scientific paper
Publié en ligne: 24 avr. 2020
Pages: 139 - 148
Reçu: 03 déc. 2019
Accepté: 16 déc. 2019
DOI: https://doi.org/10.2478/rmzmag-2019-0018
© 2019 Vončina M., Cvahte P., Kračun A., Balaško T., Medved J., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Figure 1

The cooling curve of the non-equilibrium solidification of the alloy EN AW-6008 without considering the diffusion (a) and taking into account the larger diffusion coefficients of the elements of silicon and magnesium (b).
The cooling curve of the non-equilibrium solidification of the alloy EN AW-6008 without considering the diffusion (a) and taking into account the larger diffusion coefficients of the elements of silicon and magnesium (b).

Figure 2

The cooling curve of the non-equilibrium solidification of the alloy EN AW-6060 without considering the diffusion (a) and taking into account the larger diffusion coefficients of the elements of silicon and magnesium (b).
The cooling curve of the non-equilibrium solidification of the alloy EN AW-6060 without considering the diffusion (a) and taking into account the larger diffusion coefficients of the elements of silicon and magnesium (b).

Figure 3

Heating (blue) and cooling (green) DSC curves of the samples 6008_centre (a), 6008_D/4 (b) and 6008_edge (c) with marked characteristic temperatures and corresponding microstructure images.
Heating (blue) and cooling (green) DSC curves of the samples 6008_centre (a), 6008_D/4 (b) and 6008_edge (c) with marked characteristic temperatures and corresponding microstructure images.

Figure 4

Comparison of heating (a) and cooling (b) DSC curves of EN AW-6008 alloy from different places of the rod: centre (blue), D/4 (green) and edge (red).
Comparison of heating (a) and cooling (b) DSC curves of EN AW-6008 alloy from different places of the rod: centre (blue), D/4 (green) and edge (red).

Figure 5

Heating (blue) and cooling (green) DSC curves of the sample 6060_centre (a), sample 6060_D/4 (b) and sample 6060_ edge (c) with marked characteristic temperatures and corresponding microstructure images.
Heating (blue) and cooling (green) DSC curves of the sample 6060_centre (a), sample 6060_D/4 (b) and sample 6060_ edge (c) with marked characteristic temperatures and corresponding microstructure images.

Figure 6

Comparison of heating (a) and cooling (b) DSC curves of EN AW-6060 alloy from different places of the rod: centre (blue), D/4 (green) and edge (red).
Comparison of heating (a) and cooling (b) DSC curves of EN AW-6060 alloy from different places of the rod: centre (blue), D/4 (green) and edge (red).

Figure 7

EDS analysis of samples from the alloy EN AW-6008 taken from the cross-section of the rod at D/4, centre and edge after the DSC analysis.
EDS analysis of samples from the alloy EN AW-6008 taken from the cross-section of the rod at D/4, centre and edge after the DSC analysis.

Figure 8

EDS analysis of samples from the alloy EN AW-6060 taken from the cross-section of the rod at D/4, centre and edge after the DSC analysis.
EDS analysis of samples from the alloy EN AW-6060 taken from the cross-section of the rod at D/4, centre and edge after the DSC analysis.

Diffusion of elements in aluminium at temperatures 550, 600 and 650°C at a distance of 50 mm [14, 15, 16, 17].

ElementT [°C]D [cm2/s]t [h]
Al5509.64E-107.2
6003.32E-092.1
6509.98E-090.7
Fe5506.70E-11103.6
6003.22E-1021.6
6501.30E-095.3
Si5503.21E-092.2
6001.04E-080.7
6502.95E-080.2
Mg5504.30E-091.6
6001.31E-080.5
6503.55E-080.2
Mn5502.01E-123461.6
6001.22E-11567.3
6506.14E-11113.1
Cu5509.83E-107.1
6003.15E-092.2
6508.88E-090.8
Zn5507.30E-091.0
6002.00E-080.3
6504.92E-080.1

Chemical composition of investigated alloys according to EN-AW standards in wt.%.

AlloySiFeCuMnMgCrZnTiVAl
60080.50–0.900.350.300.300.40–0.700.300.200.100.05–0.20Rest
60600.30–0.600.10–0.300.100.100.35–0.600.050.150.10–Rest
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