Composition of <i>ω</i>-Phase Particles in Ti(Mo) Alloys Studied by Anomalous X-ray Diffraction

Abstract

Nanoparticles of hexagonal ω phase in bcc-Ti(Mo) single crystals ( β phase) occur due to a diffusionless athermal β to ω transformation and they grow during follow-up ageing at elevated temperatures, while the alloying atoms (Mo in our case) are expelled from the nanoparticle volumes. We investigated the Mo content in growing ω nanoparticles by anomalous X-ray diffraction and demonstrate that the Mo expulsion from the ω phase is not full; a thin shell of a nanoparticles where the β to ω transformation is not complete still contains a considerable amount of Mo atoms.

Keywords

• Ti alloys
• <i>ω</i> nanoparticles
• anomalous X-ray diffraction