On the elastic moduli of nanocrystalline Fe, Cu, Ni, and Cu--Ni alloys prepared by mechanical milling/alloying
- Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695-7907 (United States)
- Department of Materials Science, Rice University, Houston, Texas 77251-1892 (United States)
The Young`s moduli of nanocrystalline, Fe, Cu, Ni, and Cu--Ni alloys prepared by mechanical milling/alloying have been measured by the nanoindentation technique. The results indicate that the Young`s moduli of nanocrystalline Cu, Ni, and Cu--Ni alloys with a grain size ranging from 17 to 26 nm are similar to those of the corresponding polycrystals. The dependence of Young`s modulus of nanocrystalline Fe on grain size corresponds well to a theoretical prediction, which suggests that the change in the Young and shear moduli of nanocrystalline materials, free of porosity, with a grain size larger than about 4 nm, should be very limited ({lt}10%). It is likely that reported large decreases in the Young and shear moduli of nanocrystalline materials prepared by gas-condensation/vacuum consolidation result from a relatively large volume fraction of pores. {copyright} 1995 {ital Materials} {ital Research} {ital Society}.
- Research Organization:
- Oak Ridge Institute of Science and Education
- DOE Contract Number:
- AC05-76OR00033; AC05-84OR21400
- OSTI ID:
- 124909
- Journal Information:
- Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 11 Vol. 10; ISSN JMREEE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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