Investigation of High-Temperature Eutectic-Based Microcomposites.
Abstract
The present report describes an investigation of high temperature directionally solidified eutectic-based microcomposites. The principal topics of the present report are the results of the investigations of the third year of this project. Details of earlier investigations have been described in the first and second year annual reports, and published in the open literature. This report describes the results in four areas. First, an advanced niobium-silicide based composite which shows an attractive balance of high and low temperature properties, such as fracture toughness, tensile strength, creep performance and oxidation behavior are described. The density-reduced stress rupture behavior of this composite showed an improvement over current generation advanced Ni-based superalloys. Second, recent studies of toughening mechanisms in composites generated from ternary Nb-Ti-Si alloys are described. Fracture toughness values of >20 MPa square root of m have been measured in as-DS composites. Third, the microtexture of the silicide and metallic phases in a ternary Nb-Ti-Si alloy composite have been investigated using the electron back scattering pattern technique for electron diffraction in the SEM. Microtexture measurements were performed to examine the relationship between texture and mechanical properties. Finally, the recent data relating to the ternary Nb-Ti-Si phase diagram is described.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 29, 1996
- Accession Number
- ADA311191
Entities
People
- B. P. Bewlay
- H. A. Lipsitt
- J. A. Sutliff
- Michelle R. Jackson
Organizations
- General Electric