Abstract
Extrusion temperature, strain rate, extrusion ratio, billet temperature, and extrusion geometry were varied, and correlated with the microstructure of the alloy, and the heat treating times and temperatures. The extrusion processing variables were related to the microstructure through the Zener-Hollomon parameter i.e., the temperature compensated strain rate. Based on optical and transmission electron microscopy studies it was found that regardless of the extrusion conditions, the various microstructures were for the most part were unrecrystallized for both the asextruded and the solution heat treated conditions. Smaller grain sizes were correlated to smaller Zenor-Hollomon parameters. The extrusion temperature and ratio did not significantly effect the strength or elongation. The section geometry did effect these mechanical properties.
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References
M.M. Farag and C.M. Sellars, “Flow Stress in Hot Extrusion of Commercial Purity Aluminum, Journal of the Institute of Metals, Vol. 101, pp. 137–145, 1973.
A.F. Castle and T. Sheppard, “Pressure Required to Initiate Extrusion in Some Aluminum Alloys”, Metals Technology, pp. 465–475, Oct. 1976.
D. Raybould and T. Sheppard, “Axisymmetric Extrusion: The Effect of Temperature Rise and Strain Rate on the Activation Enthalpy and Material Constants of Some Aluminum Alloys and Their Relation to Recrystallization, Substructure, and Subsequent Mechanical Properties” Journal of the Institute of Metals, Vol. 101, pp. 65–72, 1973.
P. Feltham, “Extrusion of Metals: A Simple Theory of Criteria of Press Design and Extrusion Efficiency in the Industrial Extrusion of Metals”, Metal Treatment and Drop Forging, Vol. 23, pp. 440–444, 1956.
G.E. Dieter, “Extrusion”, Mechanical Metallurgy, McGraw-Hill, Inc., Third Edition, pp. 616635, 1986.
T. Sheppard, “Temperature and Speed Effects in Hot Extrusion of Aluminum Alloys”, Metals Technology, pp. 130–141, April 1981.
]C.M. Sellars, “Hot Working Operations”, Aluminum Transformation Technology and Applications, American Society for Metals, pp. 405–440, 1978.
H.J. McQueen and J.J. Jones, “Recent Advances in Hot Working Fundamental Dynamic Softening Mechanisms”, Journal of Applied Metal Working, Vol. 3, No. 3, pp. 233–241, 1984.
C.M. Sellars, Aluminum Transformation Technology and Applications, pp. 405–440, 1978.
H.J. McQueen and J.J. Jones, Treatise on Material Science and Technology, Academic Press, New York, Vol. 6, p. 404, 1975
H.J. McQueen and J.J. Jones, Plastic Deformation of Materials, edited by R.J. Arsenault, ed., Academic press, New York.
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© 1999 Springer-Verlag Wien
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Fragomeni, J. (1999). Influence of Extrusion Processing Variables on the Microstructure and Mechanical Properties of Aluminum-Lithium Alloy Extrusions. In: Kuljanic, E. (eds) AMST ’99. International Centre for Mechanical Sciences, vol 406. Springer, Vienna. https://doi.org/10.1007/978-3-7091-2508-3_35
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DOI: https://doi.org/10.1007/978-3-7091-2508-3_35
Publisher Name: Springer, Vienna
Print ISBN: 978-3-211-83148-9
Online ISBN: 978-3-7091-2508-3
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