INVESTIGATION OF TANTALUM AND ITS ALLOYS
Abstract
Minor (1 to 2%) reactive metal (Zr, Hf) additions to Ta-W-Mo alloys effect pronounced strengthening at 1925 C (3500 F) with minimal degradation of low-temperature alloy behavior. Additions of carbon to alloys containing reactive metals degrade both 1925 C (3500 F) strength and low temperature behavior; however, ZrC dispersions exhibit pronounced strengthening at lower temperatures (1480 C (2700 F)). Solution-process anneals for alloys containing ZrC dispersion greatly increase strength at 1480 C (2700 F), but seriously impair fabricability and ductility. Mo is a less effective strengthener than W as an alloying addition to tantalum. W additions provide higher stress-rupture strengths with less degrading effects on low-temperature ductility than do equivalent atomic percentages of molybdenum. Welding increases the ductile-to- brittle transition temperature of Ta-W-Mo alloys by 300 to 500 C (540 to 900 F). Re and Ru additions showed little or no superiority to W as solid solution strengtheners, when both high-and low temperature effects were considered.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1963
- Accession Number
- AD0406757
Entities
People
- Edwin S. Bartlett
- Frank F. Schmidt
- Horace R. Ogden
Organizations
- Battelle Memorial Institute