Improved Toughness Alloys Based on Titanium Aluminides

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.

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Document Details

Document Type
Technical Report
Publication Date
Oct 26, 1989
Accession Number
ADA218149

Entities

People

  • Martin J. Blackburn
  • Michael P. Smith

Organizations

  • Pratt & Whitney

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Chemical Analysis
  • Chemistry
  • Crystal Structure
  • Electron Microscopy
  • Materials
  • Materials Engineering
  • Materials Laboratories
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Mechanical Working
  • Plastic Explosives
  • Rare Earth Elements
  • Solid Solutions
  • Tensile Strength
  • Toughness
  • Transition Metals

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.