The Effect of Heating Rate on the Density and Spatial Distribution of Dispersoids during Homogenisation of 6xxx Aluminium Alloys

Magnus S. Remøe; Knut Marthinsen; Ida Westermann; Ketill Pedersen; Jostein Røyset; Oddvin Reiso

doi:10.4028/www.scientific.net/MSF.877.322

Paper Titles

Effects of Homogenization Conditions on the Microstructures of Twin-Roll Cast Foil Stock of AA8021 Aluminum Alloy
p.296

Effect of Solution Treatment on the Properties and Microstructural Evolution of Al-Zn-Mg-Cu-Er-Zr Alloy
p.303

Combined Effect of Cold-Rolling and Aging on Precipitation and Recrystallization Behavior of Al-Er-Zr Alloy
p.310

Effect of Natural Aging of 6xxx Series Extrusions on the Energy Absorbance Capacity
p.315

The Effect of Heating Rate on the Density and Spatial Distribution of Dispersoids during Homogenisation of 6xxx Aluminium Alloys
p.322

Grain Growth Behavior of AlMg5 Alloy Fabricated by Using a New Mg Mother Alloy Containing Al₂Ca during Homogenization and Hot Compression
p.328

Effects of Mg and Mn Contents on Hot-Rolling Temperature and Resultant Tensile Properties of Al-Mg-Mn Alloys
p.334

Study of Hot Deformation Behavior of 6082 Aluminum Alloy
p.340

Study on the Ageing Process of the 6xxx Series Aluminum Alloy Wires for Overhead Conductors
p.347

HomeMaterials Science ForumMaterials Science Forum Vol. 877The Effect of Heating Rate on the Density and...

The Effect of Heating Rate on the Density and Spatial Distribution of Dispersoids during Homogenisation of 6xxx Aluminium Alloys

Abstract:

Two 6xxx alloys with different Mn-content have been homogenised in a furnace at 575 ^oC for 2 hours and 15 minutes. Three different heating rates to the homogenisation holding temperature were chosen, as this was expected to affect the precipitation behaviour of the dispersoids. The study focused on developing a reliable procedure for the characterization of the density and spatial distribution of dispersoids in aluminium alloys; both in terms of sample preparation, microscopic techniques and quantitative analyses of results. Scanning electron microscopy (SEM) has been used to evaluate the dispersoid characteristics for the different alloys and heating rates. The results indicate an increase in dispersoid number density and a more uniform distribution of dispersoids for the lowest heating rate, as compared to the more rapid heating rates, for the alloy with 0.05 wt% Mn. For the alloy with 0.15 wt% Mn the number density increased with the heating rate. This is suggested to be due to particle coarsening as an effect of the low heating rate where the samples spend longer time in the furnace.

You might also be interested in these eBooks

The 15th International Conference on Aluminium Alloys

View Preview

Info:

Periodical:

Materials Science Forum (Volume 877)

Pages:

322-327

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.877.322

Citation:

Cite this paper

Online since:

November 2016

Authors:

Magnus S. Remøe*, Knut Marthinsen, Ida Westermann, Ketill Pedersen, Jostein Røyset, Oddvin Reiso

Keywords:

Extrusion, Heating Rate, Homogenization, Mn-Dispersoids, Number Density, Scanning Electron Microscopy, Spatial Distribution

Export:

RIS, BibTeX

Price:

Permissions:

Request Permissions

* - Corresponding Author

References

[1] H. Bichel, A. Ried and J. Langerweger, Aluminium, 57(1981) 787-91.

Google Scholar

[2] O. Lohne and A.L. Dons, Quench sensitivity in aluminum–magnesium–silicon alloys containing manganese or chromium, Scandinavian Journal of Metallurgy, 12 (1983) 34-36.

Google Scholar

[3] O Reiso, U Tundal and J Andersen, The effect on cooling rate after homogenization and billet preheating practice on extrudability and section properties. part2: Microstructural investigation, Metall and Mat Trans A, 1 (1995) 141-147.

Google Scholar

[4] L. Lodgaard and N. Ryum, Precipitation of dispersoids containing Mn and/or Cr in Al–Mg–Si alloys, Mater. Sci. Eng. A, 283 (2000) 144-152.

DOI: 10.1016/s0921-5093(00)00734-6

Google Scholar

[5] Katharina Strobel, Elizabeth Sweet, Mark Easton, Jian Feng Nie and Malcolm Couper, Dispersoid phases in 6xxx series aluminium alloys, Materials Science Forum, 654-656 (2010) 926-929.

DOI: 10.4028/www.scientific.net/msf.654-656.926

Google Scholar

[6] Lars Lodgaard and Nils Ryum, Distribution of dispersoids containing Mn and/or Cr in Al-Mg-Si alloys, Aluminum Transactions, 2 (2000) 267-275.

DOI: 10.4028/www.scientific.net/msf.331-337.945

Google Scholar

[7] Personal communication with Jostein Røyset (October 2014).

Google Scholar

[8] Tanja Pettersen, Yan Jun Li, Effect of changing homogenization treatment on the particle structure in Mn-containing aluminium alloys, Trond Furu and Knut Marthinsen, Materials Science Forum. 558 (2007) 301-306.

DOI: 10.4028/www.scientific.net/msf.558-559.301

Google Scholar