NDLI: Transmission electron microscopy investigation of boundaries between amorphous “grains” in Ni$_{50}$Nb$_{20}$Y$

Content Provider	Springer Nature Link
Author	Mazilkin, A. A. Abrosimova, G. E. Protasova, S. G. Straumal, B. B. Schütz, G. Dobatkin, S. V. Bakai, A. S.
Copyright Year	2011
Abstract	Some of the authors of this article recently demonstrated that severe plastic deformation permits the production of metallic alloys containing two coexisting amorphous phases from the crystalline multiphase Ni$_{60}$Nb$_{18}$Y$_{22}$ alloy. The aim herein is to provide a detailed description of the microstructure of this system of coexisting amorphous phases by transmission electron microscopy (TEM) analysis. As-cast Ni$_{50}$Nb$_{20}$Y$_{30}$ alloy was coarse grained and contained mainly NiY phase (grain size 25 μm) as well as NbNi$_{3}$, Ni$_{2}$Y, Ni$_{7}$Y$_{2}$, and Ni$_{3}$Y phases (grain size 3–5 μm). High-pressure torsion (4 GPa, 10 torsions) completely changed the structure. After severe plastic deformation (SPD), the sample contained two glassy phases and two other nanocrystalline NiY and Nb$_{15}$Ni$_{2}$ phases (grain size about 20 nm). Bright-field TEM micrographs showed fine, 5–10 nm, round bubbles of bright Y-rich amorphous phase embedded in darker Nb-rich “grains.” In turn, the dark Nb-rich grains were separated by layers of bright Y-rich amorphous phase a few nanometers thick. This stricture permits one to speak about mutual wetting of “grain boundaries” in both amorphous phases.
Starting Page	4336
Ending Page	4342
Page Count	7
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	46
Issue Number	12
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2011-02-08
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Materials Science Mechanics Characterization and Evaluation of Materials Crystallography Continuum Mechanics and Mechanics of Materials Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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