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Plastic deformation via hierarchical nano-sized martensitic twinning in the metastable beta Ti-24Nb-4Zr-8Sn alloy
Yang, Y.1,2; Castany, P.1; Hao, Y. L.3; Gloriant, T.1
Corresponding AuthorCastany, P.(philippe.castany@insa-rennes.fr)
2020-08-01
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume194Pages:27-39
AbstractA superelastic metastable beta Ti-24Nb-4Zr-8Sn (wt.%) alloy is analyzed in the solution treated state after different applied strains in order to reveal evolution of microstructures and explore plastic deformation mechanisms. Deformation bands are observed by optical microscopy, EBSD and TEM. After 3% of strain, only few thin {332}<113>(beta) twins are observed, while after 5% of strain, complex hierarchically beta twinning structures composed of primary and secondary bands are observed by TEM. Indeed, very thin secondary {332}<113>(beta) twins are observed (about 50 nm in average) and their massive occurrence leads to the loss of the initial {332}<113>(beta) twinning relationship between matrix and primary bands which is transformed passively to an unusual type II <531>(beta) twinning relationship. Similarly, the orientation relationship between matrix and secondary twins tends to another abnormal type I {541}(beta) twinning relationship. As in situ synchrotron XRD experiments show that almost all the beta phase is transformed into alpha '' martensite under loading condition, a crystallographic reconstructing method is then used to determine the real alpha '' orientation before stress releasing. The relaxed {332}<113>(beta) twins is found to correspond perfectly to the reversion of {130}<310>(alpha '' )martensitic twins occurring under loading condition. The unusual twinning relationships between matrix and primary/secondary twins are shown to correspond to type II <512>(alpha '') and no twinning relationships in alpha '' martensite, respectively. Schmid factor analyses show that the activation of primary twins obeys the Schmid law. However, the activation of secondary twins disobeys the Schmid law due to the variant selection of alpha '' martensite occurring during primary twinning. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
KeywordMetastable beta titanium Ti2448 alloy plastic deformation twinning secondary twinning alpha '' martensite
Funding OrganizationNational Science Foundation for Young Scientists of China
DOI10.1016/j.actamat.2020.04.021
Indexed BySCI
Language英语
Funding ProjectNational Science Foundation for Young Scientists of China[51801199]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000542971400003
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/139518
Collection中国科学院金属研究所
Corresponding AuthorCastany, P.
Affiliation1.Univ Rennes, CNRS, INSA Rennes, ISCR,UMR 6226, F-35000 Rennes, France
2.Guangdong Univ Technol, Sch Electromech Engn, Guangzhou 510006, Peoples R China
3.Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Yang, Y.,Castany, P.,Hao, Y. L.,et al. Plastic deformation via hierarchical nano-sized martensitic twinning in the metastable beta Ti-24Nb-4Zr-8Sn alloy[J]. ACTA MATERIALIA,2020,194:27-39.
APA Yang, Y.,Castany, P.,Hao, Y. L.,&Gloriant, T..(2020).Plastic deformation via hierarchical nano-sized martensitic twinning in the metastable beta Ti-24Nb-4Zr-8Sn alloy.ACTA MATERIALIA,194,27-39.
MLA Yang, Y.,et al."Plastic deformation via hierarchical nano-sized martensitic twinning in the metastable beta Ti-24Nb-4Zr-8Sn alloy".ACTA MATERIALIA 194(2020):27-39.
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