Nb-Ti Based Alloy Powder Prepared by Hydride-Dehydride Method

Micro-fine lightweight Nb-Ti based alloy powder was fabricated by a hydride-dehydride method, and the hydrogen absorption/desorption behavior was investigated. Results show that obvious hydrogen absorption occurs at 300℃, and the absorbed hydrogen quantity reaches a saturation value of 1.12 wt% at 400℃. Binary and ternary hydrides (Nb0.803V0.197H, Nb0.696V0.304H and TiHx) are formed after hydrogenation. Hydrogen-induced embrittlement facilitates the pulverization of the thin alloy plate. During dehydrogenation process, hydrogen content is effectively reduced to 0.001 wt% at 300℃. Phase transformation from niobium or titanium hydrides to single phase solid solution alloy (β phase) is achieved. Oxygen content of the powder increases with increasing hydrogenation or dehydrogenation temperature due to the high reactivity of constituent elements with oxygen, and both hydrogenation and dehydrogenation temperature of 400℃ is selected in order to prevent severe oxygen intake. Micro-fine Nb-based alloy powder with average particle size 2O5 and TiO2. Copyright © 2020, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.