Effect of water quench on V_(40)Ti_(26)Cr_(26)Fe_8 hydrogen storage alloy

Water quench technicals had been widely used in heat treatment of V-based hydrogen storage alloy caused its efficiency of improving composition homogeneous and effective hydrogen capacity.In this paper,effect of water quench on V40Ti26Cr26Fe8 was investigated.and compared with annealed sample,according to micro structure analyse,annealed sample included C14 Laves phase.These phases partly dissolved in BCC phase after water quenched.The increasing of Ti content of BCC structure was observed after water quench and caused decreasing of plateau pressure.The microstrain and vacancy derived during water quench process made PCT curve of water quenched alloy more slopy and increased the hysteresis of absorption/desorption process.Also,the disfigurement derived during water quench process led part of FCC di-hydride stable,caused the loss of hydrogen storage capacity.