Accession Number : ADB041889

Title :   The Understanding and Exploitation of Alloys Based on the Compound TiAl (Gamma Phase).

Descriptive Note : Technical final rept. Mar 77-Dec 78,

Corporate Author : PRATT AND WHITNEY WEST PALM BEACH FL GOVERNMENT PRODUCTS DIV

Personal Author(s) : Blackburn, M. J. ; Smith, M. P.

Report Date : MAY 1979

Pagination or Media Count : 85

Abstract : Alloys based on the TiA1 (Gamma) phase have attractive elevated temperature properties for gas turbine applications. However, certain processing and property problems will have to be overcome before such materials are qualified for the projected applications. The work performed addressed two such problem areas. In Phase A, an extensive alloy development effort was conducted in which the effect of single and multiple elemental additions on the microstructure and mechanical properties of various TiA1 base compositions was studied in order to overcome the low ductility at room and intermediate temperature. It was shown that the best balance of tensile ductility and creep-rupture strength is achieved when the aluminum content is about 48 atomic percent. Two other positive compositional effects were demonstrated. One is the increase in ductility at room and intermediate temperature imparted by vanadium additions; the second, a large increase in creep-rupture strength resulting from the addition of 0.1 percent carbon to a Ti-A1-V base.

Descriptors :   *TITANIUM ALLOYS, *ALUMINUM ALLOYS, *ALUMINIDES, *GAS TURBINES, FORGING, RUPTURE, MICROSTRUCTURE, CARBON, CONCENTRATION(CHEMISTRY), PRODUCTION, CASTINGS, ADDITION REACTIONS, TEMPERATURE, DUCTILITY, CREEP STRENGTH, MECHANICAL PROPERTIES, VANADIUM.

Subject Categories : Inorganic Chemistry
      Properties of Metals and Alloys
      Fabrication Metallurgy
      Nuclear Physics & Elementary Particle Physics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE