J 2019

Anomalous X-ray diffraction from omega nanoparticles in beta-Ti(Mo) single crystals

SMILAUEROVA, J., P. HARCUBA, M. CIESLAR, M. JANECEKA, Václav HOLÝ et. al.

Basic information

Original name

Anomalous X-ray diffraction from omega nanoparticles in beta-Ti(Mo) single crystals

Authors

SMILAUEROVA, J., P. HARCUBA, M. CIESLAR, M. JANECEKA and Václav HOLÝ (203 Czech Republic, guarantor, belonging to the institution)

Edition

ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES, CHESTER, INT UNION CRYSTALLOGRAPHY, 2019, 2053-2733

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10403 Physical chemistry

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 1.960

RIV identification code

RIV/00216224:14740/19:00113444

Organization unit

Central European Institute of Technology

DOI

UT WoS

000484157300005

Keywords in English

anomalous X-ray diffraction; metastable beta-Ti alloys; diffuse scattering; omega phase

Tags

Tags

International impact, Reviewed
Změněno: 13/4/2022 08:50, Mgr. Marie Šípková, DiS.

Abstract

V originále

Anomalous X-ray diffraction (AXRD) is a technique which makes use of effects occurring near the energy of an absorption edge of an element present in the studied sample. The intensity of the diffracted radiation exhibits an anomalous decrease when the primary beam energy matches the energy needed to excite an electron from an atomic orbital. The characteristics of this step are sensitive to the concentration of the 'anomalous' element and its spatial distribution in the sample. In the present investigation, AXRD was employed to study omega particles in a metastable beta titanium alloy Ti-15Mo (in wt%). The experiments were done in an energy range around the Mo K edge at 20.0 keV, allowing investigation of the distribution of Mo in the material, which is rejected from the volume of omega particles during their diffusion-driven growth. This paper deals with diffuse scattering patterns around the (006)(beta) diffraction maximum. It was observed that different regions of the diffuse scattering exhibited different variations of diffracted intensity with the incident photon energy near the absorption edge. Numerical simulations of diffuse scattering patterns as well as of energy dependences of the scattered intensity were performed. It was found that the observed patterns and their dependence on the primary beam energy can be explained by taking into account (a) elastic deformation of the beta matrix arising from the presence of slightly misfitting omega particles and (b) the presence of a 'cloud' of a higher Mo concentration around omega particles.