- Work: Amorphous Al-Ce-Cu-Fe alloys: Glass formation and properties

Amorphous Al-Ce-Cu-Fe alloys: Glass formation and properties

1. Jean-Marie Dubois, Jozef Stefan Institute, Slovenia
2. Luka Kelhar, Slovenia
3. Spomenka Kobe, Jožef Stefan Institute Slovenia, Slovenia

The Al-Cu-Fe system is well known for it contains a quasicrystal, the ultimate degree of lattice complexity in an ordered solid. Susbtitution of Ce for Al atoms cancels formation of the quasicrystals, but favours amorphisation upon rapid solidification from the liquid state. Accordingly, we have studied the solubility range of Ce in this alloy when replacing Al atoms, as well as we have varied the Cu/Fe ratio at constant Al,Ce concentration. We found evidence that the local order in the glass is predominantly icosahedral, which matches the evidence of a very low glass transition temperature in the vicinity of the eutectic concentration known in the binary Al-Ce system. This interesting result can be exploited to prepare bulk specimens by spark plasma sintering, a technique that we used to produce centime-wide specimens. The magnetic properties were studied in a wide composition range and will be reported in the talk.

Key words: Metallic glasses; icosahedral order; formation and stability

Thematic field:

Date: 30.05.2019.

Contemporary Materials 2019 - Savremeni Materijali

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