STUDY OF INTERMETALLIC COMPOUNDS.
Abstract
A new class of alloys based on intermetallic compounds in the titanium-aluminum system has shown the potential for application in the temperature range of 650 to 900 C (1200 to 1650 F). This program investigated alloys based on the TiAl (gamma) compound. The portion of the program reported herein was divided into three parts: alloy optimization, process optimization and alloy characterization. The objective of the alloy optimization program was to identify an alloy with superior stress rupture strength. a number of ternary alloys based on TiAl+W were prepared and examined. Trends in tensile and stress rupture properties were determined and the alloy Ti-48(33)al-2(9) was selected for characterization. Hot isothermal pressing (HIP) parameters were developed for producing large billets from prealloyed powder. The optimum alloy was processed into a large billet using the hot isothermal pressing method and evaluated in terms of tensile, stress rupture and fatigue properties. The observed stress rupture properties were much better than previously reported (AFML-TR-78-129). (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1979
- Accession Number
- ADB048378
Entities
People
- Thomas E. O'connell
Organizations
- Pratt & Whitney