Modeling of the Formation of Stress-Induced omega Phase in Metastable beta Titanium Alloys

0499135 - ÚJF 2019 RIV PL eng J - Článek v odborném periodiku
Knapek, M. - Kozlík, J. - Čapek, Jan - Seiner, Hanuš - Šmilauerová, J. - Janeček, M.
Modeling of the Formation of Stress-Induced omega Phase in Metastable beta Titanium Alloys.
Acta Physica Polonica A. Roč. 134, č. 3 (2018), s. 769-773. ISSN 0587-4246. E-ISSN 1898-794X.
[14th International Symposium on Physics of Materials (ISPMA). Prague, 10.09.2017-15.09.2017]
Grant CEP: GA ČR GA17-04871S
Institucionální podpora: RVO:61388998 ; RVO:61389005
Klíčová slova: Ti alloys * beta titanium alloys * transformation
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.); Acoustics (UT-L)
Impakt faktor: 0.545, rok: 2018

Titanium alloys are materials with exceptional properties including high specific strength, extreme corrosion resistance, and biocompatibility. Among them, metastable beta titanium alloys are a prospective group exhibiting complex phase transformations which can be employed to improve the performance of the material. Microstructural mechanisms controlling phase transformations in these alloys are not completely understood. In this work, we propose a continuum-based model describing non-diffusional, displacive, reversible beta -> omega phase transformation which leads to a formation of stress-induced omega(def) phase. The proposed model utilizes a well-developed mathematical theory of martensitic phase transitions based on the Cauchy-Born hypothesis, and reformulates this theory to describe the crystallographic mechanism of beta -> omega(def) phase transformation. The model evaluates compatibility criteria at the interfaces between beta and omega(def) phases in relation to the external stress and provides conditions for the formation of omega(def) phase.
Trvalý link: http://hdl.handle.net/11104/0291403