Mechanical properties of nanophase TiO sub 2 as determined by nanoindentation

Journal Article · Tue May 01 00:00:00 EDT 1990 · Journal of Materials Research; (USA)

DOI:https://doi.org/10.1557/JMR.1990.1073· OSTI ID:7073731

Mayo, M J ^[1]; Siegel, R W; Narayanasamy, A ^[2]; Nix, W D ^[3]

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1. Ceramics Development Division, Sandia National Laboratories, P. O. Box 5800, Albuquerque, New Mexico 87185 (USA)
2. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (USA)
3. Department of Materials Science Engineering, Stanford University, Stanford, California 94305 (USA)

Nanoindenter techniques have been used to determine the hardness, Young's modulus, and strain rate sensitivity of nanophase TiO{sub 2}, which is currently available only in very small quantities and which cannot be tested by most conventional techniques. Hardness and Young's modulus both increase linearly with sintering temperature over the range 25--900 {degree}C but come to within only 50--70% of the single crystal values. Strain rate sensitivity, on the other hand, is measurably greater for this material than for single crystal rutile, and the value of strain rate sensitivity increases as the grain size and the sintering temperature are decreased. In its as-compacted form, the strain rate sensitivity of nanophase TiO{sub 2} is approximately a quarter that of lead at room temperature, indicating a potential for significant ductility in these ceramic materials. Finally, a significant scatter in hardness values has been detected within individual nanophase samples. This is interpreted as arising from microstructural inhomogeneity in these materials.

• DOE Contract Number: AC04-76DP00789; W-31109-ENG-38; FG03-89ER45387
• OSTI ID: 7073731
• Journal Information: Journal of Materials Research; (USA), Vol. 5:5; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
TITANIUM OXIDES
MECHANICAL PROPERTIES
SINTERING
GRANULAR MATERIALS
HARDNESS
MICROSTRUCTURE
STRAINS
YOUNG MODULUS
CHALCOGENIDES
CRYSTAL STRUCTURE
FABRICATION
MATERIALS
OXIDES
OXYGEN COMPOUNDS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies