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Effect of Hydrogen on Mechanical Properties of Aluminum AA 6061 Alloy Hardened by Precipitation

Published online by Cambridge University Press:  14 February 2012

M. A. Doñu Ruiz ,
V. J. Cortés Suárez ,
N. López Perrusquia ,
L. D. Rosado Cruz ,
F. de J. Valencia Jara  and
A. Altamirano Torres
M. A. Doñu Ruiz
Affiliation:
Instituto Politécnico Nacional, SEPI-ESIME, Adolfo López Mateos, Zacatenco, México D.F., 07738, México.
V. J. Cortés Suárez
Affiliation:
Universidad Autónoma Metropolitana UAM unidad Azcapotzalco, Departamento de Materiales, Av. San Pablo 180 Azcapotzalco, México .DF, 02200.
N. López Perrusquia
Affiliation:
Instituto Politécnico Nacional, SEPI-ESIME, Adolfo López Mateos, Zacatenco, México D.F., 07738, México.
L. D. Rosado Cruz
Affiliation:
Universidad Politécnica del Valle de México UPVM. Av. Mexiquense s/n Esquina Av. Universidad Politécnica, Col Villa Esmeralda, 54910, Tultitlan. Edo de México.
F. de J. Valencia Jara
Affiliation:
Universidad Politécnica del Valle de México UPVM. Av. Mexiquense s/n Esquina Av. Universidad Politécnica, Col Villa Esmeralda, 54910, Tultitlan. Edo de México.
A. Altamirano Torres
Affiliation:
Universidad Autónoma Metropolitana UAM unidad Azcapotzalco, Departamento de Materiales, Av. San Pablo 180 Azcapotzalco, México .DF, 02200.
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Abstract

The present work reports on the effect of hydrogen on mechanical properties of aluminum AA 6061 hardened by precipitation. Test specimens are solution treated in an electric induction furnace at 803 K during 1 hour and then precipitation hardened during 4 hours at 423, 448 and 473 K. The heat treated specimens are subjected to a hydrogen cathodic charging process during 0, 24 and 96 hours and then tested under monotonic uniaxial tensile loading according to ASTM E8-03. Scanning electron microscopy characterization of tensile fracture surfaces reveals that hydrogen charging of precipitation hardened specimens enhances intergranular cracking by microvoid coalescence and intragranular cleavage fracture. The results show that, although hydrogen charging causes embrittlement of precipitation hardened aluminum AA 6061, the effect is a function of time; short time cathodic charging increases the ductility of the alloy.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1373: Symposium S4 – Advanced Structural Materials—2011 , 2012 , imrc-1373-s4-15
Copyright
Copyright © Materials Research Society 2012

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References

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