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Microstructure-mechanical property relationships for Al-Cu-Li-Zr alloys with minor additions of cadmium, indium or tinMinor amounts of cadmium, indium or tin were added to a baseline alloy with the nominal composition of Al-2.4Cu-2.4Li-0.15Zr. These elements were added in an attempt to increase the age-hardening response of the material such that high strengths could be achieved through heat-treatment alone, without the need for intermediate mechanical working. The alloy variant containing indium achieved a higher peak hardness in comparison to the other alloy variations, including the baseline material, when aged at temperatures ranging from 160 C to 190 C. Tensile tests on specimens peak-aged at 160 indicated the yield strength of the indium-bearing alloy increased by approximately 15 percent compared to that of the peak-aged baseline alloy. In addition, the yield strength obtained in the indium-bearing alloy was comparable to that reported for similar baseline material subjected to a 6 percent stretch prior to peak-aging at 190 C. The higher strength levels obtaied for the indium-bearing alloy are attributed to increased number densities and homogeneity of both the T1 and theta-prime phases, as determined by TEM studies.
Document ID
19900057135
Document Type
Conference Paper
Authors
Blackburn, L. B. (NASA Langley Research Center Hampton, VA, United States)
Starke, E. A., Jr. (Virginia, University Charlottesville, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Subject Category
METALLIC MATERIALS
Meeting Information
Light-Weight Alloys for Aerospace Applications(Las Vegas, NV)
Distribution Limits
Public
Copyright
Other