Abstract
Zr-based Bulk metallic glasses exhibit incredible corrosion resistance and glass forming ability, however, these properties need further enhancement to meet the practical use. In this study, Zr63Fe2.5Cu23Al11.5, a new type of Zr-based bulk metallic glass was fabricated. Potentiodynamic polarization techniques were used to measure the corrosion resistance of this alloy. Furthermore, crystallization behavior and kinetics of Zr63Fe2.5Cu23Al11.5 bulk metallic glass were investigated by using differential scanning calorimetry of non-isothermal model. Kissinger and Ozawa methods were used for calculating activation energies of crystallization and the mechanism of crystallization was analyzed by Johnson-Mehl-Avrami-Kolmogorow methods. The results suggest that this specified metallic glass system possesses a relatively high thermal stability and glass forming ability. Moreover, the crystallization procedure is mainly dominated by nucleation with an increasing rate. The study demonstrates that the slight composition adjustment of Zr–Fe–Cu–Al system bulk metallic glass can make a considerable contribution to higher glass forming and thermal stability as well as corrosion resistance.
Highlights
Zr-based bulk metallic glasses (BMGs) have drawn an increasing attention in recent years for their unique properties, such as high hardness, superior strength, excellent fracture toughness, enhanced elastic limit as well as improved corrosion resistance [1, 2]
Due to the instrument we used in the present work, the critical diameter of Zr60Cu20Fe10Al10 BMG is 1 mm (Figure 1a), while the critical diameter of Zr63Fe2.5Cu23Al11.5 BMG is 5 mm (Figure 1b), which shows that the glass forming ability (GFA) of Zr63Fe2.5Cu23Al11.5 BMG is much better than that of Zr60Cu20Fe10Al10
The results indicate that Zr63Fe2.5Cu23Al11.5 BMG may have extensive application prospect compared with Zr60Cu20Fe10Al10 BMG in building practical parts
Summary
Zr-based BMGs have drawn an increasing attention in recent years for their unique properties, such as high hardness, superior strength, excellent fracture toughness, enhanced elastic limit as well as improved corrosion resistance [1, 2]. Limited GFA is a major restriction in the application of BMGs as structural materials. To build practical BMG parts, hot forming during super-cooled liquid region is often employed [9], the occurrence of partial crystallization may take place because of the thermal effect. The corrosion resistance of Zr-based bulk metallic glasses (BMGs) with amorphous structure is 1–2 orders of magnitude higher than their crystalline counter parts, for the lacking of structural defects such as dislocations or grain boundaries in BMGs [10,11,12,13]. The building up of high performance BMG parts calls for a good thermal stability of BMGs to avoid the formation of crystalline phases. The understanding of crystallization from kinetic aspect is important since the competition between nucleation and growth during the generating of crystalline phase can be quantified through the kinetic characters
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