Abstract
We studied the crystallization processes, the structure and thermal properties of amorphous alloys Cu50Zr50 and Cu46Zr46Al8 in a wide temperature range. Comparative study of the crystallization kinetics of these amorphous alloys was carried out for the first time using multivariate non-linear regression. It was found that mechanisms of the crystallization of studied metallic glasses are substantially different. The binary alloy is crystallized by branched reaction complex in four steps. For the ternary system was proposed two-step kinetic model of the crystallization process with consecutive reactions. The values of the total energy of activation for each crystallization stage reach to Cu50Zr50: E1 (345.2 kJ/mol); E2 (307.9 kJ/mol), E3 (281.1 kJ/mol), E4 (259.51 kJ/mol) and Cu46Zr46Al8: E1 (350.7 kJ/mol); E2 (150.4 kJ/mol).
Highlights
The Cu-Zr system has unique glass-forming ability (GFA) and so it is the basis for the development of separate class of bulk metallic glasses (BMG) [1,2,3]
The X-ray diffraction (XRD) peaks are rather broad due to the high density of the defects caused by the existence of martensitic phases
The XRD pattern for as-cast Cu46Zr46Al8 alloy is a broad amorphous-like hump with the single pronounced crystalline peak corresponding to B2 CuZr phase (Fig1c)
Summary
The Cu-Zr system has unique glass-forming ability (GFA) and so it is the basis for the development of separate class of bulk metallic glasses (BMG) [1,2,3]. 3. Results and discussion Firstly, we compare the structure and crystallization process of as-cast and suction-cast samples for both the Cu50Zr50 and Cu46Zr46Al8 alloys. It can be seen that as-cast Cu50Zr50 alloy is the mixture of two monoclinic martensitic phases P21/m and Cm (see Fig.1a).
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