[Kovove materialy - Metallic materials]
    Thu - July 19, 2018 - 08:10 No. of hits : 944747 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 49 (2011), Issue 1

Formation of two amorphous phases in the Ni60Nb18Y22 alloy after high pressure torsion
STRAUMAL, B. B., MAZILKIN, A. A., PROTASOVA, S. G., GOLL, D., BARETZKY, B., BAKAI, A. S., DOBATKIN, S. V.
vol. 49 (2011), no. 1, pp. 17 - 22

Abstract
It has been demonstrated for the first time that severe plastic deformation (SPD) permits to produce the metallic alloys containing two coexisting amorphous phases from the crystalline multiphase alloy. The as-cast Ni60Nb18Y22 alloy was coarse-grained and contained mainly NiY phase (grain size 25 μm) and also NbNi3, Ni2Y, Ni7Y2 and Ni3Y phases (grain size 3-5 μm). High pressure torsion (4 GPa, 10 torsions) completely changed the structure. The sample after SPD contained two glassy phases and two other nanocrystalline NiY and Nb15Ni2 phases (grain size about 20 nm). The coarse-grained alloy was mainly ferromagnetic with a small paramagnetic component. After SPD the alloy becomes strongly diamagnetic with a small ferromagnetic component. Therefore, it has been revealed that severe plastic deformation allows one to produce the composite amorphous alloys.

Key words
severe plastic deformation, Y-Ni-Nb alloys, amorphous phases

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


Article abstracts updated: 2018-06-27 07:09      
Articles in press revised: 2017-11-14 12:19     
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