Approach to the Theoretical Strength of Ti—Ni—Cu Alloy Nanocrystals by Grain Boundary Design

The grain boundary design was used to introduce boride Ti2B and TiB2nanoparticles of 5 nm in size into grain boundaries of nanocrystalline Ti50Ni25Cu25alloy.As a result,the maximum normalized microhardness was increased by 20%and the theoretical limit of hardness is substantially approached.It is pr...

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Bibliographic Details
Published in:Journal of materials science & technology 2015, Vol.31 (1), p.91-96
Main Authors: Glezer, Alexandr M., Shurygina, Nadezhda A., Blinova, Elena N., Permyakova, Inga E., Firstov, Sergey A.
Format: Article
Language:English
Subjects:
Borides
Electron
Electron microscopy
Grain boundaries
Grain boundary sliding
Hardness
Intermetallic compounds
Microhardness
microscopy
Microhardness
Nanocrystal
Nano
Nanocrystal
Nanocrystals
Nanoparticle
Nanoparticles
Theoretical hardness
Titanium base alloys
Titanium diboride
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Summary:The grain boundary design was used to introduce boride Ti2B and TiB2nanoparticles of 5 nm in size into grain boundaries of nanocrystalline Ti50Ni25Cu25alloy.As a result,the maximum normalized microhardness was increased by 20%and the theoretical limit of hardness is substantially approached.It is proposed that boride nanoparticles suppressed low-temperature grain-boundary sliding and,therefore,shifted the range of the anomalous behavior of Hall-Petch relation toward smaller sizes of the Ti-Ni-Cu nanocrystals.
ISSN:1005-0302
1941-1162
DOI:10.1016/j.jmst.2014.09.006