Accession Number:

ADA277995

Title:

The Effect of Thermomechanical Processing on Mechanical Properties of a Cast 6061 Aluminum Metal Matrix Composite

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

1993-12-01

Pagination or Media Count:

93.0

Abstract:

Thermomechanical processing was conducted on cast 6061 Al-A12O3 metal matrix composites MMCs containing either 10 or 20 volume percent of alumina A1203 particles. These materials were provided by DURALCAN-USA, Inc., of San Diego, CA in conjunction with a Cooperative Research and Development Agreement CRDA program on ductility enhancement for these MMCS. Processing included isothermal forging and rolling of materials at 500 deg C, with interpass anneal IPA times of 5 or 30 minutes. Isothermal rolling was also accomplished on 1.0 inch thick 6061-T6 Al plate. Processed materials were solution heat treated at temperatures ranging from 480-560 deg C, and were then age hardened at 160 deg C. Tensile testing was conducted to evaluate strength and ductility. Homogeneity of the particle distribution was improved by processing for both composites and no microstructural damage was apparent. Lower solution heat treatment temperature provided significant ductility enhancement while the longer IPA time at 500 deg C had a minor beneficial effect. As the percentage of reinforcement increased, aging time to peak strength decreased peak strength, and yield strength increased and ductility decreased. As the solution heat treatment temperature was decreased ductility was enhanced at a cost of peak strength. 6061 Al-A1203 Composite, Thermomechanical Processing of MMCS, Aluminum - alumina composites, Particle stimulated nucleation, PSN, Recrystallization, MMCS, Engineered materials.

Subject Categories:

  • Laminates and Composite Materials
  • Metallurgy and Metallography
  • Mechanics
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE