PROPERTIES AND NANOSTRUCTURES OF MATERIALS PROCESSED BY SPD TECHNIQUES

Conference · Mon Jan 01 04:00:00 EST 2001

OSTI ID:975748

Liao, Xiaoshan; Huang, J ^[1]; Zhu, Y T ^[2]

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1. Jianyu
2. Yuntian Theodore

Metallic materials usually exhibit higher strength but lower ductility after being plastically deformed by conventional techniques such as rolling, drawing and extrusion. In contrast, nanostructured metals and alloys processed by severe plastic deformation (SPD) have demonstrated both high strength and high ductility. This extraordinary mechanical behavior is attributed to the unique nanostructures generated by SPD processing. It demonstrates the possibility of tailoring the microstructures of metals and alloys by SPD to obtain superior mechanical properties. The SPD-generated nanostructures have many features related to deformation, including high dislocation densities, and high- and low-angle grain boundaries in equilibrium or non-equilibrium states. This paper reviews the mechanical properties and the defect structures of SPD-processed nanostructured materials. Keywords: strength, ductility, nanostructures, SPD, non-equilibrium grain boundary

• Research Organization: Los Alamos National Laboratory.
• Sponsoring Organization: DOE
• OSTI ID: 975748
• Report Number(s): LA-UR-01-5211
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
DEFECTS
DEFORMATION
DISLOCATIONS
DUCTILITY
EXTRUSION
GRAIN BOUNDARIES
GRAIN REFINEMENT
MECHANICAL PROPERTIES
NANOSTRUCTURES
PLASTICS
PROCESSING
ROLLING