Accession Number:

ADA218149

Title:

Improved Toughness Alloys Based on Titanium Aluminides

Descriptive Note:

Final rept. Aug 1985-Mar 1989

Corporate Author:

PRATT AND WHITNEY WEST PALM BEACH FL

Report Date:

1989-10-26

Pagination or Media Count:

223.0

Abstract:

Alloy development programs over the past decade have identified alloys, based on the compound Titanium aluminide alpha-two with tensile and creep properties that indicate applications at temperatures as high as 760C 1400F should be possible. However, rather low values of toughness and impact resistance at temperatures less than 260C 500F lead to concerns over component durability during assembly and service. The objective of this program was to improve the toughness of Ti3Al based alloys. In Phase I, solid solution modifications Task 1, development of a tough second phase Task 2, and formation of rare earth oxide dispersions by rapid solidification Task 3 were investigated. Task 4 evaluated a combination of those alloys and processing techniques from the first three tasks. In Phase II, three alloy systems were selected for scale-up and extensive mechanical property testing. Keywords Titanium aluminides, Rapid solidification, Powder metallurgy, Gas turbines, Fracture toughness, Engines, Turbines.

Subject Categories:

  • Properties of Metals and Alloys
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE