Ultrahigh-Vacuum Creep Behavior of Columbium and Tantalum Alloys at 2000 degs and 2200 degs F for Times Greater Than 1000 Hours
Abstract
Creep tests of 1000 hours and greater were conducted at 2000 degrees and 2200 degrees F on six commercially available refractory alloys at pressures of 10 (exp -8) to 10 (exp -9) torr. The creep behavior of three columbium alloys, FS-85 (Cb + 28Ta + 10W + 1Zr), D-43, (Ch + 10W + 1Zr +0.1C), and Cb-752 (Cb +10W + 2.5Zr), and three tantalum alloys, T-222 (Ta + 9.6W + 2.4Hf + 0.01C), T-111 (Ta + 8W + 2Hf), and Ta-10W (90Ta + 10W) was determined stress-to-density ratios of 2.6x10(exp 4) and 1.3x10(exp 4) inches, respectively, at 2000 degrees and 2200 degrees F. Comparison of creep behavior on the density-compensated basis shows that the tantalum alloy T-222 was the most creep resistant material evaluated. A total creep strain of only 0.1 percent resulted from testing this alloy for 5000 hours. The relative order of creep resistance, on a density-compensated basis, was the same for the materials evaluated at 2000 degrees and 2200 degrees F; T-222, Ta-10W, D43, FS-85, T-111, and Cb-752.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1966
- Accession Number
- ADA454218
Entities
People
- Robert H. Titran
- Robert W. Hall
Organizations
- National Aeronautics and Space Administration