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Title: Tape cast second generation orthorhombic-based titanium aluminide alloys for MMC applications. [Metal Matrix Composites]

Abstract

Titanium metal matrix composites (TMCs) utilizing continuous SiC fiber reinforcement are considered important, if not, enabling materials for advanced Air Force propulsion systems, wherein combinations of high specific strength and elevated temperature capability are prerequisites to obtain desired increases in thrust-to-weight ratios and decreased specific fuel consumption. One such class of TMCs being assessed for use in rotating engine components are those based upon the orthorhombic titanium aluminide phase, Ti[sub 2]AlNb. These orthorhombic titanium matrix composites (O TMCs) are being examined for sustained use at temperatures up to 700 C. Previous studies have primarily focused on O TMCs made using the foil-fiber-foil fabrication process. More recently the Materials and Manufacturing Directorate of the Air Force Research Laboratory has been focusing attention on an alternative powder metallurgy approach for fabrication of O TMCs via tape casting. This latter approach has the potential to produce significant cost reduction (<$70/lb) for the matrix input material (powder). Unfortunately, little work has been done to understand the effects of powder microstructures and the tape casting process itself on the mechanical performance of O TMCs. Therefore, the first objective of this study is to examine the microstructural evolution and mechanical performance (with and without heat treatment)more » of three unreinforced heat orthorhombic-based titanium aluminide matrices made via tape casting. A second objective is to assess the viability of powder metallurgy processing for the fabrication of O TMCs.« less

Authors:
;  [1];  [2]
  1. Air Force Research Lab., Wright-Patterson AFB, OH (United States). Materials and Mfg. Directorate
  2. Southwestern Ohio Council for Higher Education, Dayton, OH (United States)
Publication Date:
OSTI Identifier:
6174463
Resource Type:
Journal Article
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 41:2; Journal ID: ISSN 1359-6462
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; COMPOSITE MATERIALS; FABRICATION; FIBERS; MECHANICAL PROPERTIES; MICROSTRUCTURE; NIOBIUM ALLOYS; POWDER METALLURGY; SILICON CARBIDES; TITANIUM ALLOYS; ALLOYS; CARBIDES; CARBON COMPOUNDS; MATERIALS; METALLURGY; SILICON COMPOUNDS; 360600* - Other Materials

Citation Formats

Smith, P R, Rosenberger, A H, and Shepard, M J. Tape cast second generation orthorhombic-based titanium aluminide alloys for MMC applications. [Metal Matrix Composites]. United States: N. p., 1999. Web. doi:10.1016/S1359-6462(99)00162-1.
Smith, P R, Rosenberger, A H, & Shepard, M J. Tape cast second generation orthorhombic-based titanium aluminide alloys for MMC applications. [Metal Matrix Composites]. United States. https://doi.org/10.1016/S1359-6462(99)00162-1
Smith, P R, Rosenberger, A H, and Shepard, M J. 1999. "Tape cast second generation orthorhombic-based titanium aluminide alloys for MMC applications. [Metal Matrix Composites]". United States. https://doi.org/10.1016/S1359-6462(99)00162-1.
@article{osti_6174463,
title = {Tape cast second generation orthorhombic-based titanium aluminide alloys for MMC applications. [Metal Matrix Composites]},
author = {Smith, P R and Rosenberger, A H and Shepard, M J},
abstractNote = {Titanium metal matrix composites (TMCs) utilizing continuous SiC fiber reinforcement are considered important, if not, enabling materials for advanced Air Force propulsion systems, wherein combinations of high specific strength and elevated temperature capability are prerequisites to obtain desired increases in thrust-to-weight ratios and decreased specific fuel consumption. One such class of TMCs being assessed for use in rotating engine components are those based upon the orthorhombic titanium aluminide phase, Ti[sub 2]AlNb. These orthorhombic titanium matrix composites (O TMCs) are being examined for sustained use at temperatures up to 700 C. Previous studies have primarily focused on O TMCs made using the foil-fiber-foil fabrication process. More recently the Materials and Manufacturing Directorate of the Air Force Research Laboratory has been focusing attention on an alternative powder metallurgy approach for fabrication of O TMCs via tape casting. This latter approach has the potential to produce significant cost reduction (<$70/lb) for the matrix input material (powder). Unfortunately, little work has been done to understand the effects of powder microstructures and the tape casting process itself on the mechanical performance of O TMCs. Therefore, the first objective of this study is to examine the microstructural evolution and mechanical performance (with and without heat treatment) of three unreinforced heat orthorhombic-based titanium aluminide matrices made via tape casting. A second objective is to assess the viability of powder metallurgy processing for the fabrication of O TMCs.},
doi = {10.1016/S1359-6462(99)00162-1},
url = {https://www.osti.gov/biblio/6174463}, journal = {Scripta Materialia},
issn = {1359-6462},
number = ,
volume = 41:2,
place = {United States},
year = {Fri Jun 18 00:00:00 EDT 1999},
month = {Fri Jun 18 00:00:00 EDT 1999}
}