Considerations in the Development of Tantalum Base Alloys

Buckman, R. W.; Goodspeed, R.C.

doi:10.1007/978-1-4684-9120-3_10

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…This results in a significant hafnium concentration in the matrix which has a deleterious effect on creep resistance (ref. 4). For this reason the best creep properties are achieved in alloys containing the Ta2C precipitate since these alloys have hafnium concentrations of the order of 1 percent.…”

Section: Creep Behaviormentioning

confidence: 99%

Development of High Strength Tantalum Base Alloys.

Buckman¹,

Begley²

1970

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This paper describes the development of tantalum base alloys intended for application in advanced space power systems. For components such as piping in alkali metal Rankine cycle systems, radioisotope capsules, and fuel claddings in nuclear reactors, critical property criteria include excellent fabricability, good welding characteristics, long time thermal stability, and high creep strength. Tantalum base alloys which successfully meet these criteria were achieved by a balanced combination of solid solution and dispersed phase strengthening, as typified by the alloy ASTAR-811C (Ta-8W-lRe-0.7Hf-0.025C). This alloy has creep strength significantly superior to T-111 (Ta-8W-2Hf) at temperatures up to 2600' F, without sacrifice of fabricability or welding characteristics. The DBTT of TIG welds is of the order of -250' F, and that of recrystallized base metal is below -320' F. Data a r e presented for tensile and long time creep properties of this alloy, and the role of carbide precipitates in improving high temperature strength is discussed.Greatly improved high temperature tensile and creep properties can be achieved by an increase in tungsten level and by a substitution of nitrogen f o r carbon. While this strength increase is obtained with some sacrifice in fabricability, the alloys of increased solute level are attractive for high temperature applications where weldability is not a critical design requirement.

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Section: Creep Behaviormentioning

confidence: 99%

Development of High Strength Tantalum Base Alloys.

Buckman¹,

Begley²

1970

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“…The tantalum alloy T-111 (Ta-8%W-2%Hf) (all compositions are in weight per cent) because of its demonstrated compatibility with liquid alkali metals, and combination of strength, fabricability and weldability was selected by NASA-Lewis (now NASA-Glenn) Research Center as the baseline reference alloy for the space nuclear power systems in the mid 1960's (Moss et al, 1969). NASA Lewis Research Center sponsored tantalum alloy development to extend the operating temperature of T-111 without compromising its fabricability and/or liquid alkali metal corrosion properties; and the composition developed was ASTAR-811C (Ta-8%W-1%Re-1%Hf-0.025%C) Goodspeed, 1968 andBegley 1969). Effort on molybdenum and tungsten alloys was limited since these materials were difficult to fabricate in all the required forms and exhibited poor weldability characteristics.…”

Section: Introductionmentioning

confidence: 99%

Nuclear Space Power Systems Materials Requirements

Buckman¹

2004

AIP Conference Proceedings

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Low energy electron microscopy studies of steps on single crystal thin films of refractory metals Abstract. High specific energy is required for space nuclear power systems. This generally means high operating temperatures and the only alloy class of materials available for construction of such systems are the refractory metals niobium, tantalum, molybdenum and tungsten. The refractory metals in the past have been the construction materials selected for nuclear space power systems. The objective of this paper will be to review the past history and requirements for space nuclear power systems from the early 1960's through the SP-100 program. Also presented will be the past and present status of refractory metal alloy technology and what will be needed to support the next advanced nuclear space power system. The next generation of advanced nuclear space power systems can benefit from the review of this past experience. Because of a decline in the refractory metal industry in the United States, ready availability of specific refractory metal alloys is limited.

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Symposium on metallurgy and technology of refractory metal alloys—A state-of-the-art review

Machlin

1968

JOM

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Considerations in the Development of Tantalum Base Alloys

Cited by 6 publications

References 5 publications

Development of High Strength Tantalum Base Alloys.

Development of High Strength Tantalum Base Alloys.

Nuclear Space Power Systems Materials Requirements

Symposium on metallurgy and technology of refractory metal alloys—A state-of-the-art review

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