Environmental effect on mechanical properties of L1[sub 2]-ordered (Fe[sub 22]Co[sub 78])[sub 3]V
- Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.
Recently, environmental embrittlement has been investigated in many ordered intermetallics including Co[sub 3]Ti, Ni[sub 3]Al, Ni[sub 3]Si, FeAl, Fe[sub 3]Al, and (Fe,Co)[sub 3]V. At ambient temperatures, the embrittlement is caused mainly by hydrogen released from moisture in air. A number of intermetallics also show a reduction in ductility at elevated temperatures; however, the cause of the ductility reduction is not well understood at the present time. Oxygen is identified as an embrittling agent in Ni[sub 3]Al and Ni[sub 3]Si alloys but apparently not in other alloys such as Ni[sub 3][Si,Ti] and Co[sub 3]Ti. L1[sub 2]-ordered intermetallic alloys with compositions (Fe[sub 22]Co[sub 78])[sub 3]V exhibited moisture-induced hydrogen embrittlement when tested in air at ambient temperatures. Their ductility also decreases with increasing temperature above 500 C and reaches a minimum around the critical ordering temperature [[Tc] = 910 C] when tested in vacuum. At present, there is no detailed study of the environmental effect in (Fe,Co)[sub 3]V at elevated temperatures. In this study, the environmental effect on the ductility and fracture in (Fe,Co)[sub 3]V is investigated at various temperatures and in various atmospheres, and the results are compared with those from other intermetallic alloys.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 7104855
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Vol. 26:11; ISSN 0956-716X
- Country of Publication:
- United States
- Language:
- English
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