Nanostructuring of Aluminum Alloy Powders by Cryogenic Attrition with Hydrogen-Free Process Control Agent

Report No. ARL-TR-7208
Authors: Frank Kellogg; Clara Hofmeister; Anit Giri; Kyu Cho
Date/Pages: February 2015; 22 pages
Abstract: Aluminum 5083 powder was milled through cryogenic attrition for 8, 16, and 24 h with graphite as a hydrogen-free process control agent. The powders were degassed to remove moisture and other impurities. The degassed powders have a relatively low hydrogen concentration. The morphology, grain sizes, and stability of the milled powders were compared, and it was found that while there was little difference in grain size between the 3 milling times, powders milled for 16 and 24 h showed more grain stability than powders milled for 8 h.
Distribution: Approved for public release
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Last Update / Reviewed: February 1, 2015