Effects of alloy composition in alleviating embrittlement problems associated with the tantalum alloy T-111
Technical Report
·
OSTI ID:4171983
The causes of aging embrittlement in T-111 (Ta-8W-2Hf) and the effect of alloy modification were investigated. Results show that T-111 possesses a critical combination of tungsten and hafnium that leads to loss in ductility at - 196$sup 0$C after aging near 1040$sup 0$C. It was found that this occurs because tungsten enhances hafnium segregation to grain boundaries, which also leads to increased susceptibility to hydrogen embrittlement. Aging embrittlement was not observed in tantalum alloys with reduced tungsten or hafnium contents; most of the alloys studied have lower strengths than T-111 and exhibit susceptibility to hydrogen embrittlement. (STAR)
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, Ohio (USA). Lewis Research Center
- NSA Number:
- NSA-33-001248
- OSTI ID:
- 4171983
- Report Number(s):
- N--75-14883; NASA-TN-D--7838; E--7880
- Country of Publication:
- United States
- Language:
- English
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