Accession Number : ADA613745


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


Descriptive Note : Final rept. Jul 2013-Aug 2014


Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE


Personal Author(s) : Kellogg, Frank ; Hofmeister, Clara ; Giri, Anit ; Cho, Kyu


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a613745.pdf


Report Date : Feb 2015


Pagination or Media Count : 24


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.


Descriptors :   *ALUMINUM ALLOYS , *POWDERS , ATTRITION , CRYOGENICS , GRAIN SIZE , HYDROGEN , NANOSTRUCTURES


Subject Categories : Properties of Metals and Alloys


Distribution Statement : APPROVED FOR PUBLIC RELEASE