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Bulk metallic glasses from the Zr-Al-Ni-Cu-Nb system

Marcin Malicki

Abstract

Zr – based bulk metallic glasses (BMGs) exhibit interesting mechanical properties since they combine high fracture stress, elastic strain up to 2 %, significant fracture toughness and good corrosion resistance. The addition of the next element to the quaternary alloys often increases the glass forming ability (GFA) and improves mechanical properties. The aim of this work was to study the influence of the minor additions of niobium on the glass forming ability and on the mechanical properties of the Zr-Al-Ni-Cu alloys. The master alloys of the following compositions: Zr60Al15Ni10Cu10Nb5, Zr55Al20Ni10Cu10Nb5, Zr60Al20Ni10Cu5Nb5, Zr60Al20Ni5Cu10Nb5 were prepared by arc melting of pure elements. The ribbons thickness of about 70 - 120 µm and width of 2 mm were melt spun on a copper wheel. Rod shape samples with maximum diameter of 3 mm were produced by casting method into a copper mould. The structure of all alloys was examined by X-ray diffraction. The thermal stability associated with glass transition and crystallization temperature was measured at different heating rates by differential scanning calorimetry. The GFA was investigated on the basis of temperature interval of supercooled liquid region (ΔT). Mechanical properties were examined by microhardness. All results were compared with those obtained for alloy without niobium Zr60Al20Ni10Cu10. Amorphous alloys were successfully manufactured by melt spinning (all ribbons) method. The minor (5 at%) addition of niobium increases the onset temperature of crystallization (thermal stability) and GFA, representing by value of parameter ΔT, in amorphous ribbons. The Vickers microhardness of ribbon was very high and exceeds more than 950 HV0.05. All manufactured rod shape samples were crystalline.
Diploma type
Engineer's / Bachelor of Science
Diploma type
Engineer's thesis
Author
Marcin Malicki (FMSE/DCFM) Marcin Malicki,, Division of Construction and Functional Materials (FMSE/DCFM)Faculty of Materials Science and Engineering (FMSE)
Title in Polish
Masywne szkła metaliczne z układu Zr-Al-Ni-Cu-Nb
Supervisor
Jerzy Latuch (FMSE/DCFM) Jerzy Latuch,, Division of Construction and Functional Materials (FMSE/DCFM)Faculty of Materials Science and Engineering (FMSE)
Certifying unit
Faculty of Materials Science and Engineering (FMSE)
Affiliation unit
Division of Construction and Functional Materials (FMSE/DCFM)
Study subject / specialization
, Inżynieria Materiałowa
Language
(pl) Polish
Status
Finished
Defense Date
07-01-2010
Issue date (year)
2009
Internal identifier
IM-001384
Reviewers
Waldemar Kaszuwara (FMSE/DCFM) Waldemar Kaszuwara,, Division of Construction and Functional Materials (FMSE/DCFM)Faculty of Materials Science and Engineering (FMSE) Andrzej Olszyna (FMSE/DSMP) Andrzej Olszyna,, Division of Ceramic Materials and Polymers (FMSE/DSMP)Faculty of Materials Science and Engineering (FMSE)
Keywords in Polish
SZKŁA METALICZNE, MATERIAŁY AMORFICZNE
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Uniform Resource Identifier
https://repo.pw.edu.pl/info/bachelor/WUTa156120442424469809a40fcc46b51da/
URN
urn:pw-repo:WUTa156120442424469809a40fcc46b51da

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