Interim analysis of long time creep behavior of columbium C-103 alloy. [Nb--10Hf--1Ti--0. 7Zr]
Technical Report
·
OSTI ID:7228059
Analysis of 16 long-time creep tests on columbium C-103 alloy (Cb--10Hf--1Ti--0.7Zr) indicates that the calculated stresses to give 1 percent creep strain in 100,000 hours at 1,255 K (1800 F) are 7.93 and 8.96 MPa (1,150 and 1,300 psi) for fine-grained and course-grained materials, respectively. The apparent activation energy and stress dependence for creep of this alloy are approximately 315 KJ/gmol (75,300 cal/gmol) and 2.51, respectively, based on Dorn--Sherby types of relations. However, the 90 percent confidence limits on these values are wide because of the limited data currently available. (auth)
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
- OSTI ID:
- 7228059
- Report Number(s):
- N-76-21318; NASA-TM-X-71895; E-8681
- Country of Publication:
- United States
- Language:
- English
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