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Quench Sensitivity of Almgsi-Alloys Containing Mn or Cr

Published online by Cambridge University Press:  21 February 2011

A.L. Dons  and
O. Lohne
A.L. Dons
Affiliation:
SINTEF, Department of Metallurgy, N-7034 Trondheim-NTH, Norway
O. Lohne
Affiliation:
SINTEF, Department of Metallurgy, N-7034 Trondheim-NTH, Norway
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Abstract

In AlMgSi-alloys cooled from about 773K (500°C) the strength after ageing depends on the rate of cooling. By addition of Mn or Cr dispersoids are formed which may control grain structure. The dispersoids also act as nucleation sites for coarse β′-Mg2Si particles. This makes the alloys more quench sensitive, in this paper the influence of 0.56%Mn on quench sensitivity is compared to that of 0.23%Cr in Al–O.6%Mg-1.0%Si industrial alloys.

The alloys were homogenized at 793K (520°C) and 853K (580°C), extruded, quenched in water or cooled in air, and aged to maximum hardness. The density of dispersoids varied with homogenizing heat treatment. Quench sensitivity increased with increasing density of dispersoids.

The two alloys had about equal densities of dispersoids after homogenizing at 793K (520°C), but the alloy containing Cr was found to be more quench sensitive than the alloy containing Mn. This is discussed and compared with other findings.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 21: Symposium GREECE – Phase Transformations in Solids , 1983 , 723
Copyright
Copyright © Materials Research Society 1984

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References

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