Strength and toughness of a Nb/Nb5Si3 composite
Creators
- 1. UES, Inc., Dayton, OH (United States)
- 2. WL/MLLM, Wright-Patterson, OH (United States)
Description
Recent studies have shown that within the Nb-Si system, the two-phase Nb/Nb5Si3 microstructures exhibit excellent thermochemical stability and resistance to coarsening up to 1500 C. In addition, these Nb/Nb5Si3 'in situ composites' exhibit a good balance in mechanical properties, having a reasonably high strength up to 1500 C and high fracture toughness at room temperature. These combined properties of the composites provide an attractive basis for developing high-temperature structural materials. Studies are currently underway on creep mechanisms and alloying to enhance the oxidation resistance of these composites. Most of the published results on this system pertain to the wrought Nb-10 at. pct Si alloy in which the large primary Nb particles provide toughening while the intermetallic Nb5Si3 phase in the eutectoid microconstituent provides high-temperature strength. The present work was undertaken to determine the strength and toughness of a wrought alloy with near-eutectic composition, Nb-1.65 at. pct Si, at temperatures from 25 C to 1500 C. The increased Si content is known to decrease the volume fraction of the primary Nb particles and increase the overall volume fraction of the Nb5Si3 intermetallic phase
Additional details
Publishing Information
- Journal Title
- Metallurgical Transactions. A, Physical Metallurgy and Materials Science
- Journal Volume
- 24
- Journal Issue
- 2
- Journal Page Range
- p. 501-504.
- ISSN
- 0360-2133
- CODEN
- MTTABN
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 25008856
- Subject category
- S36: MATERIALS SCIENCE;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- CASTING; COMPOSITE MATERIALS; CORROSION RESISTANCE; CREEP; ELECTRON MICROPROBE ANALYSIS; EXPERIMENTAL DATA; EXTRUSION; FRACTURE PROPERTIES; INTERMETALLIC COMPOUNDS; MECHANICAL PROPERTIES; MICROSTRUCTURE; NIOBIUM; NIOBIUM SILICIDES; OXIDATION; SCANNING ELECTRON MICROSCOPY; TEMPERATURE RANGE 1000-4000 K; X-RAY DIFFRACTION
- Descriptors DEC
- ALLOYS; CHEMICAL ANALYSIS; CHEMICAL REACTIONS; COHERENT SCATTERING; CRYSTAL STRUCTURE; DATA; DIFFRACTION; ELECTRON MICROSCOPY; ELEMENTS; FABRICATION; INFORMATION; MATERIALS; MATERIALS WORKING; METALS; MICROANALYSIS; MICROSCOPY; NIOBIUM COMPOUNDS; NONDESTRUCTIVE ANALYSIS; NUMERICAL DATA; SCATTERING; SILICIDES; SILICON COMPOUNDS; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS