Electrochemical and Corrosion Behavior of Nanocrystalline TiNi-Based Alloys and Composite

In this work TiNi-based nanocrystalline alloys and composite were produced by mechanical alloying process with subsequent annealing at 750 ◦C for 0.5 h. Mechanical alloying was performed in a SPEX 8000 Mixer Mill. TiNi alloy was chemically modi ed by Ag elemental powder. Silver content equaled 5 wt%. X-ray di raction analyses revealed formation of TiNi main phase after annealing. Additionally, two minor phases Ti2Ni and TiNi3 were detected for unmodi ed alloy. Crystallites of obtained powders were nanosized. Corrosion and electrochemical measurements were performed in 6 M KOH solution. All synthesized materials were used as negative electrode for Ni-MHx batteries. Ag addition positively a ects on stability of discharge capacity of TiNi alloy during of charge/discharge tests.