Stress release-induced interfacial twin boundary ω phase formation in a β type Ti-based single crystal displaying stress-induced α” martensitic transformation

Y. Yang 1 P. Castany 1 E. Bertrand 2 M. Cornen 1 J.X. Lin 3, 4 T. Gloriant 1
1 ISCR - Institut des Sciences Chimiques de Rennes
2 IMN - Institut des Matériaux Jean Rouxel
3 CAS - Chinese Academy of Sciences [Beijing]
4 Fujian Institute of Research on the structure of Matter
Abstract : The ω phase transformation in numerous group IV transition metals plays a key role to change the phase stability and modify mechanical properties, although its formation mechanisms and effect to accommodate strains are still unclear. A <1 1 0>β single crystal of β-type Ti-24Nb-4Zr-8Sn alloy (wt. %) is used to investigate the aforementioned problems. This alloy displays a β to α” stress-induced martensitic transformation, which is reversible and leads to superelasticity. Profiles obtained from in situ synchrotron X-ray diffraction during cyclic tensile tests reveal definitely the appearance of ω phase due to applied stress releasing after unloading while these identified ω peaks shall vanish totally on subsequent loading. TEM microstructural observations show its morphology as thin layer locating on the boundary of {1 1 2}<1 1 1>β twins coinciding well with the feature of interfacial twin boundary (ITB) ω phase, which is proved to be formed passively during the reversion of {1 1 0}<1 1 0>α” twins. The martensitic twinning components of {1 1 0}<1 1 0>α” are indeed confirmed from crystallographic reconstructions based on the orientation relationship between the β and α” phases. A geometrical model is hence schematically used to analyze in details the orientation relationships between both deformation {1 1 2}<1 1 1>β twins and ITB-ω phase, as well as with the original {1 1 0}<1 1 0>α” twinning.
Keywords : {1 1 0}<1 1 0>α” Deformation twinning Interfacial phase ITB-ω phase Stress-induced martensitic transformation {1 1 2}<1 1 1> β
Document type :
Journal articles
Complete list of metadatas

Cited literature [29 references]  Display  Hide  Download
https://hal-univ-rennes1.archives-ouvertes.fr/hal-01740146
Contributor : Laurent Jonchère <>
Submitted on : Friday, July 6, 2018 - 9:42:06 AM
Last modification on : Sunday, December 23, 2018 - 7:06:15 PM
Long-term archiving on : Tuesday, October 2, 2018 - 2:41:00 AM

File

Yang et al_Stress release-indu...
Files produced by the author(s)

Identifiers

Collections

UNIV-RENNES1 | UNIV-NANTES | UNIV-RENNES | UR1-UFR-SPM | INC-CNRS | SCR_CM | ISCR | IMN | INSA-RENNES | INSA-GROUPE

Citation

Y. Yang, P. Castany, E. Bertrand, M. Cornen, J.X. Lin, et al.. Stress release-induced interfacial twin boundary ω phase formation in a β type Ti-based single crystal displaying stress-induced α” martensitic transformation. Acta Materialia, Elsevier, 2018, 149, pp.97-107. ⟨10.1016/j.actamat.2018.02.036⟩. ⟨hal-01740146⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

279

Files downloads

115