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Electrochemical hydrogen storage, mechanical and thermal behaviors of novel Mg-based alloy

In this study, Mg65Ni25Y5B5 metallic glass by melt spinning technique was examined in terms of its electrochemical hydrogen storage characteristic, mechanical and thermal behaviors. The XRD and SEM results indicated that the alloy ribbon has a fully amorphous structure. The thermal behavior of the alloy ribbon was determined using flash differential scanning calorimetry (Flash DSC). According to Flash DSC results, the amorphous alloy ribbon exhibited distinct glass transition temperature (T g ) and wide supercooled liquid region (ΔT x = T x − T g ) before crystallization. Accordingly, T g and ΔT x are 195 °C and 63 °C, respectively. Mechanical behavior of the Mg-based alloy at room temperature was determined by means of Vickers microhardness (HV) tester. The microhardness value of the alloy ribbon was measured 336,8 HV. The discharge capacity of the Mg65Ni25Y5B5 alloy reached 313 mAhg−1. The cycle stability revealed that the alloy ribbon protected at least 76.7% of its initial discharge capacity at 12th charge-discharge cycle.