Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2014 - zeszyt 2

Novel, Fe-based functional bulk amorphous materials obtained using suction casting method

MARCIN NABIAŁEK

nr katalogowy: 84297

Nowadays are being searched materials with better functional properties, than currently applied. For a sure, as such group of materials can be treated bulk amorphous alloys (BMGs), which are characterized by much better properties than their crystalline counterparts [1]. Metallic amorphous alloys are known since 70's of previous age when P. Duwez has found novel method at that time, for production amorphous metallic ribbons [2, 3]. This method was successfully adapted by scientists and industrials and is used to nowadays [4]. Amorphous ribbons are produced by injection of liquid alloy onto rotating with high linear speed (usually around 30 m/s), copper cylinder [4÷6]. Ingots of pre-alloy are made from melted, in plasma arc, proper quantities of atomic elements. Melting of ingots during production process is made in quartz capillary, using induction furnace of medium power [5]. Further, liquid alloy is injected from capillary under a pressure of neutral gas onto copper drum, rotating with linear velocity in range from 104 K/s to 106 K/s [1, 3, 6]. Such large cooling speed do not provide the possibility of producing a material with larger dimensions, which greatly limits the possibilities of its use. Therefore, for three decades were sought ways to produce amorphous materials with larger than the critical thickness of 100 microns, in the case of amorphous ribbons. Of course, during these thirty years, several alloys in the form of rods with a thickness of more than 1 mm were prepared, but recipe giving the possibility of systematic receiving bulk amorphous materials, were not found. The breakthrough came in 1989 when Akihisa Inoue and colleagues proposed three criteria giving the possibility of producing amorphous alloys with thicknesses previously unachievable [1]: 1. Alloy must consist of more than three components, 2. Atomic radii at least of the main alloying elements must differ by more than 12%, 3. The alloying ele[...]

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