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Titel
Influence of Ag and Co additions on glass-forming ability, thermal and mechanical properties of Cu–Zr–Al bulk metallic glasses
Autor*in
B. Escher
IFW Dresden, Institute for Complex Materials, Germany
Autor*in
U. Kühn
IFW Dresden, Institute for Complex Materials, Germany
Autor*in
J. Eckert
IFW Dresden, Institute for Complex Materials, Germany
... show all
Abstract
In this study, the effect different amounts of Ag and Co have on thermal stability, phase formation and mechanical properties of the glass-forming alloys (Cu0.5Zr0.5)95-x-yAl5AgxCoy (2 ≤ x ≤ 5 and 0 ≤ y ≤ 2) and Cu47.5-yZr47.5Al5Coy (0 ≤ y ≤ 2) was investigated, respectively. The addition of Ag increases the glass-forming ability (GFA) of the alloys by enhancing the stability of the undercooled melt and by simultaneously reducing the stability of the B2 CuZr high-temperature phase. Co instead, has the opposite effect. It leads to an increased thermal stability of the B2 phase, as well as a decreased stability of the undercooled melt and, consequently, lowers the GFA of the alloys. Moreover, a metastable big cube phase precipitates in some alloys stabilized by oxygen, which is introduced during casting. There is a strong interdependence between the phase formation and the tendency of the present alloys to vitrify. This correlation can be captured by the K-parameter (Song et al. 2011 [1]) calculated from the respective transformation temperatures. The plastic strain of the present ternary, quaternary and quinary alloys reflects the GFA as well: the higher the tendency to form a glass, the smaller the plastic strain. Once B2 crystals precipitate in the glass, the plasticity is enhanced significantly.
Objekt-Typ
Sprache
Englisch [eng]
Stichwort
amorphous materialsmetallic glassesmechanical propertiescalorimetryX- ray diffraction
Verfügbarkeitsdatum
2018-07-02
Datum der Annahme zur Veröffentlichung
2016
Seitenanfang
90
Seitenende
98
Erschienen in
Titel
Materials Science and Engineering: A
Band
673
Verlag
Elsevier BV
Projektnummer
I1309 – Austrian Science Fund (FWF)
Persistent identifier
https://phaidra.univie.ac.at/o:944951
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