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Characterization of Age Hardening in a 319 AL Alloy

Published online by Cambridge University Press:  02 July 2020

R. Jahn ,
W. T. Donlon  and
J. E. Allison
R. Jahn
Affiliation:
Ford Research Laboratories, P.O. Box 2053, MD 3135, Dearborn, MI, 48121.
W. T. Donlon
Affiliation:
Ford Research Laboratories, P.O. Box 2053, MD 3135, Dearborn, MI, 48121.
J. E. Allison
Affiliation:
Ford Research Laboratories, P.O. Box 2053, MD 3135, Dearborn, MI, 48121.
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Extract

319 Al (7.2-7.7wt% Si, 3.3-3.7%Cu, 0.25-0.35%Mg, 0.4%max.Fe, 0.2-0.3%Mn, 0.25%max Zn, 0.25%max Ti) is utilized by the automotive industry for engine blocks and cylinder heads. Detailed understanding of the age hardening behavior of these types of alloys is important to optimize the processing of these components to yield the desired physical properties. Age hardening curves for temperatures between 100 and 305°C have been determined for a commercial grade 319 Al alloy having a dendrite arm spacing of 30(im. Samples for TEM were prepared by conventional grinding and dimpling followed by ion milling at 4keV at liquid nitrogen temperatures. The phases formed within the primary aluminum dendrites during age hardening were characterized by JEOL 2000FX and an OXFORD ISIS microanalysis system.

Age hardening curves for Al-Cu alloys are characterized by multiple hardening stages as shown by Silcock, et al. Figure 1 shows an example of a 150°C age hardening curve for 319 Al.

Type
Microscopy and Microanalysis in the “Real World”
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 514 - 515
Copyright
Copyright © Microscopy Society of America

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References

References:

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