Accommodation mechanisms in strain-transformable titanium alloys
Yolaine Danard,Guilhem Martin,Lola Lilensten,Fan Sun,Anthony Seret,Régis Poulain,S.A. Mantri,Raphaëlle Guillou,D. Thiaudière,I. Freiherr von Thüngen,D. Galy,Michaël Piellard,Nathalie Bozzolo,Rajarshi Banerjee,Frédéric Prima +14 more
TLDR
In this article, a β-metastable Ti-alloy is designed with the aim to obtain a TWIP alloy but positioned at the limit between the TRIP/TWIP and the TWIP dominated regime.Abstract:
A new β-metastable Ti-alloy is designed with the aim to obtain a TWIP alloy but positioned at the limit between the TRIP/TWIP and the TWIP dominated regime. The designed alloy exhibits a large ductility combined with an elevated and stable work-hardening rate. Deformation occurring by formation and multiplication of {332} twins is evidenced and followed by in-situ electron microscopy, and no primary stress induced martensite is observed. Since microstructural investigations of the deformation mechanisms show a highly heterogeneous deformation, the reason of the large ductility is then investigated. The spatial strain distribution is characterized by micro-scale digital image correlation, and the highly deformed regions are found to stand at the crossover between twins, or at the intersection between deformation twins and grain boundaries. Detailed electron back-scattered imaging in such regions of interest finally allowed to evidence the formation of thin needles of stress induced martensite. The latter is thus interpreted as an accommodation mechanism, relaxing the local high strain fields, which ensures a large and stable plastic deformation of this newly designed Ti-alloy.read more
Citations
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Role of stress-induced martensite on damage behavior in a metastable titanium alloy
TL;DR: In this article, the authors investigated the damage behavior of a typical model metastable Ti-1023 alloy with dominant stress-induced martensite (SIM) using uniaxial tensile test and nano-indentation measurement.
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Static and dynamic Hall‒Petch relations in {332} TWIP Ti–15Mo alloy
Kai Yao,Xiaohua Min +1 more
TL;DR: In this paper, the effect of grain size on the tensile properties of Ti-15Mo alloy and Ti-1Fe alloy deformed by dislocation slip was examined, and the dynamic Hall-Petch relation was established by the effective grain size.
Journal ArticleDOI
Design of metastable β-Ti alloys with enhanced mechanical properties by coupling αS precipitation strengthening and TRIP effect
Nana Chen,Hongchao Kou,Fengming Qiang,Ke Hua,Chuanyun Wang,Bin Tang,Jinshan Li,Jon M. Molina-Aldareguia +7 more
TL;DR: In this article , a strain-transformable microstructure was successfully designed in a metastable β Ti-7Mo-3Nb-3Cr-3Al alloy by introducing ∼28% α precipitates coupled with the TRIP effect, overcoming the traditional trade-off dilemma between strength and ductility.
A new titanium alloy with a combination of high strength,high strain hardening and improved ductility
TL;DR: In this article, a ternary β-metastable titanium Ti-9Mo-6W (wt.%) was designed and detailed microstructural analysis was performed to understand the deformation process.
References
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