Accession Number : ADA257859


Title :   Thermomechanical Processing of Aluminum Alloy 2519 for Grain Refinement and Superplasticity


Descriptive Note : Master's thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Bohman, Scott D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a257859.pdf


Report Date : 18 Jun 1992


Pagination or Media Count : 88


Abstract : Thermomechanical processing (TMP) methods developed for Al-Mg and Al- Mg-Li alloys have been modified and applied to the commercial 2519 Al-Cu alloy. The TMP included initial overaging and was designed to facilitate particle- stimulated nucleation (PSN) of recrystallization during controlled reheating intervals between successive rolling passes of the process. Effects of TMP variables were evaluated by tensile testing at temperatures ranging from 300-450 deg C. Strain rates varied from 6.7xl0 to the -5 power 1/s to 6.7xl0 to the -3 power 1/s. Also, microstructural analysis was conducted to determine the effect of the processing on the microstructure. The further evolution of microstructure during superplastic testing of the material was also assessed. Refinement to grain sizes below 10 microns by PSN was achieved. Superplastic ductility of 260 pct. elongation was limited by grain growth.


Descriptors :   *THERMOMECHANICS , *ALUMINUM ALLOYS , *GRAIN SIZE , *SUPERPLASTICITY , MAGNESIUM , MATERIALS , TENSILE PROPERTIES , RATES , ALLOYS , VARIABLES , RECRYSTALLIZATION , ELONGATION , GRAIN GROWTH , DUCTILITY , HEATING , ALUMINUM , COPPER , PARTICLES , LITHIUM , INTERVALS , ROLLING(METALLURGY) , STRAIN RATE , NUCLEATION , THESES , COPPER ALLOYS , PROCESSING , TEMPERATURE , MICROSTRUCTURE


Subject Categories : Properties of Metals and Alloys
      Plastics
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE