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.
Highlights
Nanoparticles of metastable ω phase occur at a certain composition range in the metastable β alloys of Group IV elements, including important engineering alloys of Ti and Zr [1]
It was widely believed that the formation of the ω phase is a purely displacive transformation accomplished by the collapse of two neighboring (111)β planes and that in this stage the ω particles have the same composition as the parent β matrix [11]
We present the results of anomalous X-ray diffraction (AXRD) measurements on a selected ω diffraction peak in
Summary
Nanoparticles of metastable ω phase occur at a certain composition range in the metastable β alloys of Group IV elements, including important engineering alloys of Ti and Zr [1]. These particles are either ellipsoidal in low misfit systems [2,3] or cuboidal in systems with a higher misfit [4,5]. It was widely believed that the formation of the ω phase is a purely displacive transformation accomplished by the collapse of two neighboring (111)β planes and that in this stage the ω particles have the same composition as the parent β matrix [11]. The lattice parameter a β of the body-centered β phase and the lattice parameters of the hexagonal ω phase obey the formulas
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