skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The Effect of the Presence of 2 wt% Hafnium in T-111

Abstract

Tantalum alloys have been used by the U.S. Department of Energy as structural alloys for space nuclear power systems such as Radioisotopic Thermoelectric Generators (RTG) since the 1960s. Tantalum alloys are attractive for high temperature structural applications due to their high melting point, excellent formability, good thermal conductivity, good ductility (even at low temperatures), corrosion resistance, and weldability. A number of tantalum alloys have been developed over the years to increase high-temperature strength (Ta-10%W), and reduce creep strain (T-111). These tantalum alloys have demonstrated sufficient high-temperature toughness to survive prolonged exposure to the RTG's working environment. Due to the commercial unavailability of the tantalum alloy T-111, Ta-10%W is a possible candidate replacement material because of its high melting point (3037 deg. C), high elastic modulus (207 GPa), high yield, ultimate tensile strengths at both ambient and elevated temperatures, excellent ductility, and exceptional creep properties. Ta-10%W is also attractive due its commercial availability and low cost when compared to T-111. The objective of this paper is to compare and contrast Ta-10%W and T-111 for high-temperature nuclear based power conversion applications and to document research that must be conducted to fully characterize both materials.

Authors:
 [1];  [2];  [3]
  1. University of Dayton, 300 College Park Dayton OH 45469-0240 (United States)
  2. University of Dayton Research Institute, 300 College Park Dayton OH 45469-0102 (United States)
  3. Argonne National Laboratory, P.O. Box 2528, Idaho Falls, ID 83403-2528 (United States)
Publication Date:
OSTI Identifier:
20798016
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 813; Journal Issue: 1; Conference: 10. conference on thermophysics applications in microgravity; 23. symposium on space nuclear power and propulsion; 4. conference on human/robotic technology and the national vision for space exploration; 4. symposium on space colonization; 3. symposium on new frontiers and future concepts, Albuquerque, NM (United States), 12-16 Feb 2006; Other Information: DOI: 10.1063/1.2169256; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 36 MATERIALS SCIENCE; COMPARATIVE EVALUATIONS; CORROSION RESISTANCE; CREEP; DUCTILITY; ENERGY CONVERSION; HAFNIUM; HAFNIUM ALLOYS; MELTING POINTS; NUCLEAR POWER; POWER GENERATION; PRESSURE RANGE GIGA PA; RADIOISOTOPES; REACTOR MATERIALS; SPACE VEHICLES; STRAINS; TANTALUM ALLOYS; TESTING; THERMAL CONDUCTIVITY; THERMOELECTRIC GENERATORS; WELDABILITY; NESDPS Office of Nuclear Energy Space and Defense Power Systems

Citation Formats

Barklay, Chadwick D., Kramer, Daniel P., and Miller, Roger G. The Effect of the Presence of 2 wt% Hafnium in T-111. United States: N. p., 2006. Web. doi:10.1063/1.2169256.
Barklay, Chadwick D., Kramer, Daniel P., & Miller, Roger G. The Effect of the Presence of 2 wt% Hafnium in T-111. United States. doi:10.1063/1.2169256.
Barklay, Chadwick D., Kramer, Daniel P., and Miller, Roger G. Fri . "The Effect of the Presence of 2 wt% Hafnium in T-111". United States. doi:10.1063/1.2169256.
@article{osti_20798016,
title = {The Effect of the Presence of 2 wt% Hafnium in T-111},
author = {Barklay, Chadwick D. and Kramer, Daniel P. and Miller, Roger G.},
abstractNote = {Tantalum alloys have been used by the U.S. Department of Energy as structural alloys for space nuclear power systems such as Radioisotopic Thermoelectric Generators (RTG) since the 1960s. Tantalum alloys are attractive for high temperature structural applications due to their high melting point, excellent formability, good thermal conductivity, good ductility (even at low temperatures), corrosion resistance, and weldability. A number of tantalum alloys have been developed over the years to increase high-temperature strength (Ta-10%W), and reduce creep strain (T-111). These tantalum alloys have demonstrated sufficient high-temperature toughness to survive prolonged exposure to the RTG's working environment. Due to the commercial unavailability of the tantalum alloy T-111, Ta-10%W is a possible candidate replacement material because of its high melting point (3037 deg. C), high elastic modulus (207 GPa), high yield, ultimate tensile strengths at both ambient and elevated temperatures, excellent ductility, and exceptional creep properties. Ta-10%W is also attractive due its commercial availability and low cost when compared to T-111. The objective of this paper is to compare and contrast Ta-10%W and T-111 for high-temperature nuclear based power conversion applications and to document research that must be conducted to fully characterize both materials.},
doi = {10.1063/1.2169256},
journal = {AIP Conference Proceedings},
number = 1,
volume = 813,
place = {United States},
year = {Fri Jan 20 00:00:00 EST 2006},
month = {Fri Jan 20 00:00:00 EST 2006}
}