The Subregular Model For Multiple Amorphous Alloys

Amorphous alloys, as a new kind of material which were first concerned by scientists in30’s of the last century. This new materials were popular with many fields because of their prominent properties, such as high strength, high hardness, high catalytic activity, high corrosion resistance etc. Since1980s, various of critical size of bulk metallic glasses had been prepared, such as Pd-Ni-P, Ln-Al-TM, Mg-TM-RE, Mg-Cu-Y-M, Cu-, Zr-etc. However, most of these researches on amorphous alloys were still focused on the empirical experiments, and under the limitation of experiments, the data obtained by experiments were not so exactly. So it is very important to predict the amorphous alloys ability in theory. In our team, we improved a new model called ’subregular model’, basing on the famous’Miedema Theory’, to predict the amorphous forming ability and the amorphous forming ranges of the multicomponent alloys system. In this paper, this new model had been used to calculate the amorphous formation enthalpy of Ni-Nb-M alloy, to predict the amorphous forming ability and amorphous forming ranges of Zr-Al-Cu-RE alloy. Some other alloys were also calculated and compared with experimental data, the agreement shows very well. Morever, some conclusions were obtained:1. Ni-Nb can form amorphous alloys with Early transition metals very well in the eutectic composition range of Ni-Nb.2. For (ZryAl1-y)0.75(Cu1-xREx)0.25, while y=0.5or0.6, it can form amorphous well.3. While Zr and Al at a certain content, with more and more Cu was replaced by RE, the amorphous forming ranges of Zr-Al-Cu-RE become smaller, and the amorphous stability reduced.4. While Cu was replaced by RE at a certain content, with Zr content increased, Al content decreased, the amorphous forming ranges of (ZryAl1-y)0.75(Cu1-xREx)0.25become smaller, and the amorphous stability reduced.