Is superplasticity in the future of nanophase materials

Conference · Sun Jul 01 00:00:00 EDT 1990

OSTI ID:6336198

Siegel, R W

The ultrafine grain sizes and high diffusivities in nanophase materials assembled from atomic clusters suggest that these materials may have a strong tendency toward superplastic mechanical behavior. Both small grain size and enhanced diffusivity can be expected to lead to increased diffusional creep rates as well as to a significantly greater propensity for grain boundary sliding. Recent mechanical properties measurements at room temperature on nanophase Cu, Pd, and TiO{sub 2}, however, give no indications of superplasticity. Nonetheless, significant ductility has been clearly demonstrated in these studies of both nanophase ceramics and metals. The synthesis of cluster-assembled nanophase materials is described and the salient features of what is known of their structure and mechanical properties is reviewed. Finally, the answer to the question posed in the title is addressed. 34 refs., 6 figs.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6336198
• Report Number(s): CONF-900466-96; ON: DE91006079
• Resource Relation: Conference: Spring meeting of the Materials Research Society (MRS), San Francisco, CA (USA), 16-21 Apr 1990
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER
MECHANICAL PROPERTIES
PALLADIUM
TITANIUM OXIDES
DUCTILITY
GRAIN BOUNDARIES
GRAIN SIZE
HARDNESS
PLASTICITY
STRAIN RATE
SYNTHESIS
CHALCOGENIDES
CRYSTAL STRUCTURE
ELEMENTS
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
SIZE
TENSILE PROPERTIES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
360103* - Metals & Alloys- Mechanical Properties
360203 - Ceramics
Cermets
& Refractories- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies