Ultrahigh-temperature tensile properties of a powder metallurgy processed tungsten-3. 6 w/o rhenium-1. 0 w/o thoria alloy

Journal Article · Thu Aug 01 00:00:00 EDT 1991 · Scripta Metallurgica; (United States)

DOI:https://doi.org/10.1016/0956-716X(91)90309-O· OSTI ID:5578809

Luo, A; Jacobson, D L; Shin, K S ^[1]

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1. Arizona State Univ., Tempe, AZ (United States). Dept. of Chemical, Bio and Materials Science Engineering

Metals that have been dispersion hardened with stable oxides provide ideal systems to study the strengthening effect of second-phase particles at high temperatures. Thoria (ThO{sub 2}), a compound having the highest melting temperature among all the metallic oxides, is one of the most promising second-phase particles in strengthening tungsten at ultrahigh temperatures. On the other hand, tungsten has been severely limited due to the difficulties experienced in fabrication. An effective way to lower the ductile-brittle transition temperature of tungsten is to alloy with rhenium at a composition of about 4.0 weight percent rhenium. Therefore, it is necessary to add both thoria and rhenium to tungsten in order to improve the high-temperature strength and room-temperature fabricability. The present paper reports the tensile properties of a thoria particle strengthened W-Re alloy at ultrahigh temperatures. The present study was focused on the strengthening mechanism of dispersed thoria particles in the W-Re matrix and the deformation behavior of a power metallurgy processed W-Re-ThO{sub 2} alloy in a temperatures range of 1400 to 2600 K.

• OSTI ID: 5578809
• Journal Information: Scripta Metallurgica; (United States), Journal Name: Scripta Metallurgica; (United States) Vol. 25:8; ISSN 0036-9748; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
360104 -- Metals & Alloys-- Physical Properties
ACTINIDE ALLOYS
ACTINIDE COMPOUNDS
ALLOYS
BRITTLENESS
CHALCOGENIDES
CHEMICAL COMPOSITION
DISPERSION HARDENING
DUCTILE-BRITTLE TRANSITIONS
FABRICATION
FRACTURE MECHANICS
HARDENING
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
MATERIALS
MECHANICAL PROPERTIES
MECHANICS
METALLURGY
OXIDES
OXYGEN COMPOUNDS
PHASE STABILITY
POWDER METALLURGY
REFRACTORY METAL COMPOUNDS
RHENIUM ADDITIONS
RHENIUM ALLOYS
RHENIUM COMPOUNDS
RHENIUM OXIDES
STABILITY
STRAIN HARDENING
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TENSILE PROPERTIES
THORIUM ADDITIONS
THORIUM ALLOYS
THORIUM COMPOUNDS
THORIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN ALLOYS