Development of a Protective Surface Layer on Orthorhombic Titanium Aluminide Composites

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: N/A
Agency Tracking Number: 32313
Amount: $99,955.00
Phase: Phase I
Program: SBIR
Awards Year: 1996
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Ues, Inc.
4401 Dayton-Xenia Road, Dayton, OH, 45432
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Dr Krish Krishnamurthy
 (513) 255-1320
Business Contact
Phone: () -
Research Institution
N/A
Abstract
UES is proposing a novel approach for the protection of orthorhombic titanium aluminide matrix composites (OTMCs) from interstitial embrittlement using a ductile surface layer. The surface layer will be composed of a Nb-Ti-al-Cr alloy which offers the following advantages: (a) Excellent ductility, (b) adequate oxidation resistance, (c) good chemical and thermomechanical compatibility with the orthorhombic titanium aluminide matrix, and (d) excellent formability including cold-rollability into foil. The specific objectives of the proposed Phase I effort are to: (1) demonstrate the feasibility of developing a ductile surface layer of a Nb-Ti based alloy on a Ti-22A1-23Nb/SCS-6 composite and fiberless matrix, (2) establish proof-of-concept by tensile testing and out-of-phase thermomechanical fatigue (TMF) testing, (3) characterize the reaction between the Ti alloy substrate and the Nb-Ti alloy surface layer, and (4) evaluate the extent of oxidation and its effect on tensile properties after 500 hr exposure to air at 650 and 700 degree C. In the first part of this program, a Nb-40Ti-10Al-l0Cr (atomic %) alloy surface layer will be used for the proof-of-concept demonstration. In the second part of the program, the layer composition will be refined with Hf addition and evaluated.

* information listed above is at the time of submission.

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