Accession Number:

ADA280626

Title:

Feasibility of (IMC)d-Reinforced Metal Matrix Composites

Descriptive Note:

Final technical rept.

Corporate Author:

VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF MATERIALS ENGINEERING

Personal Author(s):

Report Date:

1994-05-01

Pagination or Media Count:

20.0

Abstract:

A series of metal matrix composites were produced by co-extruding TiB2-reinforced near-gamma titanium aluminide intermetallic composites IMC within matrices of two commercial titanium alloy compositions. The components of the composites were produced or obtained in powder form, homogeneously blended, and deformation-processed at 1038 deg C in an attempt to evolve an aligned metal matrix composite microstructure via the principles of commensurate deformation. The IMCs, which were ultimately blended within the metallic matrix, art characterized by insitu-synthesized TiB2 the particulate is highly faceted, single crystalline, and has an average diameter of approximately 0.4 utm. The results of this feasibility study indicate that while the IMC-reinforced composites can be successfully produced by extrusion, the extent of deformation in the titanium aluminide intermetallic composite component is much less than that which would be predicted if it deformed equally with the titanium matrix phase. While the expected effect of IMC strength as varied by the percentage of TiB2 synthesized within the IMC on the ability to deform the IMC at high temperatures was not observed, the extent to which the IMC deforms was found to be enhanced by higher flow stresses in the titanium matrix phase. Recommendations based upon the experiences of the present work include creating a more deformable IMC-reinforcing phase by extruding at a higher homologous temperature, e.g., by alternatively utilizing the trialuminide A13Ti as a matrix for the IMC-reinforcement in the titanium matrices.

Subject Categories:

  • Laminates and Composite Materials
  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE