Hydrogenation of (Zr69.5Al7.5Cu12Ni11)100 − xTix quasicrystalline alloys and its effect on their structural and microhardness behavior

•Hydrogen storage properties of (Zr69.5Al7.5Cu12Ni11)100 − xTix quasicrystalline alloys.•Influence of hydrogenation on the structure/microstructure and microhardness behavior of quasicrystalline alloys.•The study is focused on the structure/microstructure-property correlations.

The present study deals with the microstructural changes with respect to the addition of Ti and their correlation with hydrogen storage characteristics of (Zr69.5Al7.5Cu12Ni11)100 − xTix (x = 0, 4 and 12) quasicrystalline alloys. The grain size of quasicrystals decreases with addition of Ti. It has been found that the alloy with x = 0 absorbed 1.20 wt. %, whereas the alloys with x = 4 and 12 absorbed 1.38 wt. % and 1.56 wt. % of hydrogen respectively. Hydrogenation was found to exhibit a significant effect on the structure/microstructure and microhardness behavior of (Zr69.5Al7.5Cu12Ni11)100 − xTix quasicrystalline alloys. Variation in the microhardness behavior has been discussed based on a structure–property correlation.