The increase of strength properties at nanocrystal formation

[Display omitted] •Effect of amorphous matrix and nanocrystal size on microhardness is studied.•Dependence of microhardness on nanocrystal size is opposite to Petch-Hall law.•The dependence fits to different type of interaction nanocrystals with shear bands. To obtain a correct estimate of the micro...

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Bibliographic Details
Published in:Materials letters 2017-11, Vol.206, p.64-66
Main Authors: Abrosimova, G., Aronin, A.
Format: Article
Language:English
Subjects:
Edge dislocations
Functional properties
Materials science
Microhardness
Microstructure
Nanocrystalline materials
Nanocrystals
Shear bands
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Summary:[Display omitted] •Effect of amorphous matrix and nanocrystal size on microhardness is studied.•Dependence of microhardness on nanocrystal size is opposite to Petch-Hall law.•The dependence fits to different type of interaction nanocrystals with shear bands. To obtain a correct estimate of the microhardness dependence on the size of nanocrystals, the microhardness of amorphous-nanocrystalline samples with the same fraction of the crystalline phase and the same composition of the amorphous matrix but different sizes of nanocrystals was studied. It is shown that the dependence of microhardness on the nanocrystal size in the size range from 5 to 15nm obeys the inverse Petch-Hall law and corresponds to different mechanisms of interaction nanocrystals with shear bands.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2017.06.098