Abstract
In this study, the effects of the Ca addition on the glass forming ability (GFA), thermal stability, microhardness and corrosion resistance of as-spun Zr66.7−xNi33.3Cax (x=0, 1, 3 and 5at.%) alloys have been investigated using X-ray diffraction (XRD), differential scanning calorimetry (DSC), Vickers-type hardness tester and electrochemical measurement. The corroded sample surfaces were examined using field emission scanning electron microscopy (FESEM). The results show that the Ca addition can effectively enhance the GFA of the as-spun Zr-based alloys. Moreover, the Zr63.7Ni33.3Ca3 metallic glass shows the highest thermal stability indicated by the largest activation energy for crystallization. The Ca addition can effectively enhance the microhardness and 3at.% Ca addition exhibits the highest microhardness value. The corrosion resistance of the Zr-based metallic glasses in 0.5M NaCl, 1M HCl and 1M NaOH solutions has been tested by electrochemical workstation. 5at.% Ca addition effectively improve the corrosion resistance of Zr-based metallic glasses in chloride-containing solutions, and all the Zr-based metallic glasses exhibit good corrosion resistance in NaOH solution.
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