Accession Number : ADA300080

Title :   Thermomechanical Processing of an Al Alloy 2519, and an Assessment of Its Superplastic Response.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Peet, Benjamin B.

PDF Url : ADA300080

Report Date : MAR 1995

Pagination or Media Count : 62

Abstract : The effects of different overaging temperatures and times prior to the rolling portion of a thermomechanical process (TMP) were examined to determine those combinations resulting in refined microstructures capable of supporting superplastic behavior. Specimens of processed Al 2519 were tension tested at elevated temperatures after varying TMP parameters. Enhanced ductility in comparison to unprocessed material was observed at all test temperatures in the range of 3OO-45O0C. Moderate superplastic ductilities (up to 300%) were encountered under some conditions. Backscattered electron imaging techniques coupled with quantitative microstructural analysis methods were used to examine both processed and deformed samples. The correlations among processing, microstructure and mechanical behavior are presented.

Descriptors :   *ALUMINUM ALLOYS, *SUPERPLASTICITY, PLASTIC DEFORMATION, THERMOMECHANICS, STRESS STRAIN RELATIONS, FIGHTER AIRCRAFT, TENSILE STRENGTH, MICROSTRUCTURE, AGING(MATERIALS), PROCESSING, HIGH TEMPERATURE, THESES, GRAIN SIZE, NUCLEATION, BACKSCATTERING, STRENGTH(MECHANICS), MICROSCOPY, STRAIN RATE, COPPER, PLASTIC PROPERTIES, COOLANTS, DUCTILITY, STRENGTH WEIGHT RATIO, ELONGATION, RECRYSTALLIZATION, TENSILE TESTERS, FIRE CONTROL RADAR, TITANIUM ALLOYS, BOMBER AIRCRAFT, ROLLING(METALLURGY).

Subject Categories : Properties of Metals and Alloys
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE