Flow softening during high temperature deformation of Nb-10 a/o Si in-situ composite
- Wright State Univ., Dayton, OH (United States)
- Air Force Wright Aeronautical Labs., Wright-Patterson AFB, OH (United States). Materials Lab.
In-situ composites, consisting of a brittle intermetallic matrix and a ductile metallic phase, have been of considerable interest as high temperature structural materials. Some of these materials have been shown to have considerably room temperature fracture toughness. The ductile metallic phase plays a major role in toughening the composite by bridging cracks in the brittle matrix. Recent work on the high temperature deformation of Nb-10 a/o Si alloy showed that the material undergoes flow softening during deformation. Flow softening is manifested by the decrease in flow stress with increasing strain, and is typically observed during deformation when extensive dislocation annihilation is taking place. Flow softening has been observed in two-phase alloys, such as Al-Mg alloys, Zr-2.5 Nb and titanium alloys. This paper discusses the mechanism of flow softening occurring during high temperature deformation of Nb-10 a/o Si in-situ composite.
- OSTI ID:
- 6987106
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 27:6; ISSN SCRMEX
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ANNIHILATION
BASIC INTERACTIONS
COMPOSITE MATERIALS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEFORMATION
DISLOCATIONS
ELECTROMAGNETIC INTERACTIONS
IN-SITU PROCESSING
INHIBITION
INTERACTIONS
LINE DEFECTS
MATERIALS
NIOBIUM ALLOYS
PARTICLE INTERACTIONS
PROCESSING
SILICON ALLOYS
STRAINS
STRESSES
TEMPERATURE DEPENDENCE