Influence of heat treatment on the microstructure and hydrogen storage properties of Ti_(10)V_(77)Cr_6Fe_6Zr alloy

摘要

The as-cast Ti_(10)V_(77)Cr_6Fe_6Zr alloy was heat-treated at 1373 K for 8 h or 1523 K for 5 min and then quenched in water. The influence of heat treatment on the microstructure and hydrogen storage properties of Ti_(10)V_(77)Cr_6Fe_6Zr alloy was investigated systematically. The results show that all of the as-cast and heat-treated alloys consist of BCC main phase and C14 Laves secondary phase. After heat treatment, the phase abundance of BCC enhances and the plateau region of P-C-T curve is flattened, but the hydrogen absorption capacity is decreased. However, the alloy heat-treated at 1523K for 5 min achieves a enhanced hydrogen desorption capacity of 1.82 wt.% at 333 K against 0.1 MPa, which is higher than 1.44 wt.% hydrogen desorption capacity of the as-cast alloy.