Structure and Mechanical Behaviour of Cu‐Zr‐Ni‐Al Amorphous Alloys Produced by Rapid Solidification

Abstract

The amorphous ribbons of Cu 50 Zr 40 Ni 5 Al 5 alloy were manufactured by rapid solidification. The ribbons were investigated by X-ray diffraction (XRD), scanning electron microscopy coupled with energy dispersive spectroscopy (SEM-EDX) and differential scanning calorimetry (DSC). The activation energy of the crystallisation in amorphous alloys was determined by Kissenger technique. The mechanical properties of the ribbons were characterized using Vickers microhardness (HV) tester. According to the XRD and SEM results, the Cu 50 Zr 40 Ni 5 Al 5 alloys have a fully amorphous structure. The EDX analysis of the ribbons showed that compositional homogeneity of the Cu 50 Zr 40 Ni 5 Al 5 alloy was fairly high. From the DSC curves of the amorphous ribbons, it was determined that glass transition temperature (T g) is around 440-442°C and super-cooled liquid region (ΔT x = T x-T x) before crystallisation is around 61-64°C. The microhardness of the as-quenched ribbons was measured about 550 HV. However, this microhardness value decreased with increasing annealing temperature and it was calculated about 465 HV after annealing temperature of 800°C.

Investigation on Mechanical and Electrical Properties of Cu-Ti Nanocomposite Produced by Mechanical Alloying

“…A variety of methods have been used to produce Cu-Ti alloys, for instance melting and casting processes or solid-state processing like powder metallurgy. In particular, new methods such as rapid solidification, severe plastic deformation (SPD), accumulative rollbonding (ARB), electrolysis, high-energy milling and sol-gel have been proposed to prepare Cu-Ti alloys [17][18][19][20][21][22]. Among these approaches, mechanical alloying (MA) due to simplicity and cheapness of the process, being ecofriendly and homogenous dispersion of the second phase, has a special place for the production of Cu-Ti alloys.…”