The effect of hydrogenation on the fracture of Ti2AlNb-based alloy during ball milling

• Published in: Journal of alloys and compounds Vol. 902; p. 163794
• Main Authors: Senkevich, K.S., Pozhoga, O.Z., Kudryavtsev, E.A., Zasypkin, V.V.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 05.05.2022; Elsevier BV
• Subjects: Ball milling; Composition effects; Dispersion; HDH-powders; Hydrides; Hydrogen; Intermetallic compounds; Intermetallic hydride; Phase composition; Rapid solidification; Solid solutions; Ti2AlNb orthorhombic alloys; Ti2AlNb orthorhombic alloys; Ball milling; HDH-powders; Intermetallic hydride; Rapid solidification
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2022.163794

•Hydrogenation of the rapidly solidified alloy is carried out up to 2.0 wt% H.•The phase evolution of Ti2AlNb-based alloy depending on hydrogen content is shown.•Ductility strongly decreases in the alloy containing 0.5 wt% H or higher.•The formation of intermetallic hydride affects greatly the extent of alloy powdering. In this work we have studied the effect of phase composition and microstructure of a rapidly solidified Ti2AlNb-based alloy containing hydrogen on deformation of the alloy during ball milling and production of a fine-dispersed powder. Hydrogen is introduced into the alloy up to a concentration of 2.0 wt%. The X-Ray diffraction (XRD) analysis and Scanning Electron Microscopy (SEM) show that the alloy has the following phase compositions depending on hydrogen content: β + O, β/β-hydride, β/β-hydride + intermetallic hydride (Ti2AlNbHx) or a single-phase intermetallic hydride. It is found that in the hydrogenated β + O alloy containing a small amount of hydrogen a strong decrease in ductility occurs, but this does not affect the ball milling and synthesis of the fine-dispersed powder. Efficient milling of the rapidly solidified alloy has been achieved when hydrogen content was 1.2 wt% and exceeding this value when a transformation from the H-saturated solid solution into a hydride phase is observed in the alloy or the formation of a single phase hydride occurs.