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The effect of trace additions of Zn on the precipitation behavior of alloy 8090 during artificial agingThe effect(s) of trace additions of Zn to the artificial aging behavior of alloy 8090 (Al-Li-Cu-Mg-Zr) was investigated in the approximate composition range 0-1 wt-pct Zn. Trace Zn additions were found to delay aging and under equivalent aging treatments (100 hrs at 160 C) the alloy without Zn and the 1.07 wt-pct Zn alloy developed delta-prime-free zones along subgrain boundaries, while the alloys of 0.21 and 0.58 wt-pct Zn did not. DSC analysis indicated that Zn was being incorporated into the delta-prime, shifting it's exotherm to higher temperatures, while having little if any effect on its associated endotherm making it unlikely that it is an artifact of a solvus shift. In the 8090 + 1.07 wt-pct Zn alloy, coarse precipitates were found to reside on subgrain boundaries and EDS indicated that they were rich in Cu and Zn. It was also noted that in the Zn containing 8090 varients, the S prime precipitates were more coarse in size than the baseline 8090.
Document ID
19920053628
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kilmer, R. J.
(NASA Langley Research Center Hampton, VA, United States)
Stoner, G. E.
(Virginia, University Charlottesville, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Metallic Materials
Meeting Information
Meeting: Symposium on Light-Weight Alloys for Aerospace Applications II
Location: New Orleans, LA
Country: United States
Start Date: February 17, 1991
End Date: February 21, 1991
Accession Number
92A36252
Funding Number(s)
CONTRACT_GRANT: NAG1-745
Distribution Limits
Public
Copyright
Other

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