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Title: Aging Effects on Microstructural and Mechanical Properties of Select Refractory Metal Alloys for Space Reactor Applications

Abstract

Refractory alloys based on niobium, tantalum and molybdenum are potential candidate materials for structural applications in proposed space nuclear reactors. Long-term microstructural stability is a requirement of these materials for their use in this type of creep dominated application. Early work on refractory metal alloys has shown aging embrittlement occurring for some niobium and tantalum-base alloys at temperatures near 40% of their melting temperatures in either the base metal or in weldments. Other work has suggested microstructural instabilities during long-term creep testing leading to decreased creep performance. This paper examines the effect of aging 1,100 hours at 1098, 1248 and 1398 K on the microstructural and mechanical properties of two niobium (Nb-1Zr and FS-85), tantalum (T-111 and ASTAR-811C) and molybdenum (Mo-41Re and Mo-47.5Re) base alloys. Changes in material properties are examined through mechanical tensile testing coupled with electrical resistivity changes and microstructural examination through optical and electron microscopy analysis.

Authors:
 [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Shared Research Equipment Collaborative Research Center
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
931633
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 366; Journal Issue: 1-2
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AGING; ALLOYS; ASTAR 811C; CREEP; ELECTRIC CONDUCTIVITY; ELECTRON MICROSCOPY; HEAT RESISTING ALLOYS; MECHANICAL PROPERTIES; NIOBIUM; REACTORS; REFRACTORY METALS; TANTALUM; NESDPS Office of Nuclear Energy Space and Defense Power Systems

Citation Formats

Leonard, Keith J, Busby, Jeremy T, and Zinkle, Steven J. Aging Effects on Microstructural and Mechanical Properties of Select Refractory Metal Alloys for Space Reactor Applications. United States: N. p., 2007. Web. doi:10.1016/j.jnucmat.2007.03.025.
Leonard, Keith J, Busby, Jeremy T, & Zinkle, Steven J. Aging Effects on Microstructural and Mechanical Properties of Select Refractory Metal Alloys for Space Reactor Applications. United States. doi:10.1016/j.jnucmat.2007.03.025.
Leonard, Keith J, Busby, Jeremy T, and Zinkle, Steven J. Mon . "Aging Effects on Microstructural and Mechanical Properties of Select Refractory Metal Alloys for Space Reactor Applications". United States. doi:10.1016/j.jnucmat.2007.03.025.
@article{osti_931633,
title = {Aging Effects on Microstructural and Mechanical Properties of Select Refractory Metal Alloys for Space Reactor Applications},
author = {Leonard, Keith J and Busby, Jeremy T and Zinkle, Steven J},
abstractNote = {Refractory alloys based on niobium, tantalum and molybdenum are potential candidate materials for structural applications in proposed space nuclear reactors. Long-term microstructural stability is a requirement of these materials for their use in this type of creep dominated application. Early work on refractory metal alloys has shown aging embrittlement occurring for some niobium and tantalum-base alloys at temperatures near 40% of their melting temperatures in either the base metal or in weldments. Other work has suggested microstructural instabilities during long-term creep testing leading to decreased creep performance. This paper examines the effect of aging 1,100 hours at 1098, 1248 and 1398 K on the microstructural and mechanical properties of two niobium (Nb-1Zr and FS-85), tantalum (T-111 and ASTAR-811C) and molybdenum (Mo-41Re and Mo-47.5Re) base alloys. Changes in material properties are examined through mechanical tensile testing coupled with electrical resistivity changes and microstructural examination through optical and electron microscopy analysis.},
doi = {10.1016/j.jnucmat.2007.03.025},
journal = {Journal of Nuclear Materials},
number = 1-2,
volume = 366,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}