Design of strain-transformable titanium alloys

Castany, Philippe; Gloriant, T.; Sun, Fan; Prima, Frédéric

doi:10.1016/j.crhy.2018.10.004

Cited by 39 publications

(26 citation statements)

References 72 publications

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“…Ti-11Mo-5Sn-5Nb ). This diagram has been extensively utilised to produce alloys with desired TWIP or combined TWIP/TRIP effects [4] . The electronic parameters of TWIP Ti alloys [23][24][25][26][27][28][29][30] were calculated and the alloy compositions are located in the Bo − Md map in Fig.…”

Section: Ti-mo Vectormentioning

confidence: 99%

“…{332} 113 is the dominant twinning mode for all documented alloys. Although straininduced β → ω transformation is observed in some of the Ti-V and Ti-Cr based alloys, ω phase transformation is known to have a marginal contribution to strain-hardening [4] . A significant advantage of TWIP Ti alloys compared to the TRIP/TWIP ones is that the yield strength of the former can easily achieve over 600 MPa with controlled grain size and solid solution hardening, whilst preserving excellent ductility and ultimate strength.…”

Section: Ti-mo Vectormentioning

confidence: 99%

“…including strain-induced α martensitic transformation (orthorhombic) [4] , strain-induced ω phase transformation (hexagonal or trigonal) [5] , {332} 113 twinning [6] , {112} 111 twinning [7] and dislocation slip [8] . In general it is believed that the required fault energy ( γ FE , the energy to inelastically shear the material in one-atomic-layer) to operate the different deformation modes follows: [9,10] .…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Evolution and Strain-Hardening in TWIP Ti Alloys

Zhao

Dye

et al. 2019

SSRN Journal

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a b s t r a c tA multiscale dislocation-based model was built to describe, for the first time, the microstructural evolution and strain-hardening of {332} 113 TWIP (twinning-induced plasticity) Ti alloys. This model not only incorporates the reduced dislocation mean free path by emerging twin obstacles, but also quantifies the internal stress fields present at β-matrix/twin interfaces. The model was validated with the novel Ti-11Mo-5Sn-5Nb alloy (wt.%), as well as an extensive series of alloys undergoing {332} 113 twinning at various deformation conditions. The quantitative model revealed that solid solution hardening is the main contributor to the yield stress, where multicomponent alloys or alloys containing eutectoid β-stabilisers exhibited higher yield strength. The evolution of twinning volume fraction, intertwin spacing, dislocation density and flow stress were successfully described. Particular attention was devoted to investigate the effect of strain rate on the twinning kinetics and dislocation annihilation. The modelling results clarified the role of each strengthening mechanism and established the influence of phase stability on twinning enhanced strain-hardening. Strain-hardening stems from the formation of twin obstacles in early stages, whereas the internal stress fields provide a long-lasting strengthening effect throughout the plastic deformation. A tool for alloy design by controlling TWIP is presented.

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Section: Ti-mo Vectormentioning

confidence: 99%

Section: Ti-mo Vectormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructural Evolution and Strain-Hardening in TWIP Ti Alloys

Zhao

Dye

et al. 2019

SSRN Journal

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“…There is a recent incentive to transfer this successful material's design concept to metastable Ti alloys (Castany et al, 2018;Brozek et al, 2016;Sun et al, 2014). Ti alloys have recently experienced increased popularity due to new processing techniques, most prominently the emerging field of additive manufacturing (Froes, 2013).…”

Section: Introductionmentioning

confidence: 99%

Predicting the available work from deformation-induced α′′ martensite formation in metastable β Ti alloys

Nießen¹,

Pereloma²,

Saleh³

2020

J Appl Crystallogr

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Deformation-induced α′′ martensite formation is essential to the mechanical properties of a variety of metastable β Ti alloys by extending elasticity or contributing to work-hardening during plastic deformation. Nevertheless, to date, a comprehensive analysis of the effect of β texture and applied stress state on the martensitic transformation to α′′ is still lacking. The present study therefore provides a detailed analysis of the work which is made available from the shape strain of the martensitic transformation under a variety of in-plane stress states and as a function of β crystal orientation. The available work was found to strongly depend on the applied stress state and the parent grain orientation. The shape strain of the martensitic transformation was obtained from applying the phenomenological theory of martensite crystallography. In cases where this theory was not applicable, an approximation of the shape strain by the Bain strain was found to provide a good approximation of the available work. Analysis of three different metastable β Ti alloys showed no strong effect of the alloy composition on the available work. Martensite formation from typical cold- and warm-rolling β texture components under different stress states is discussed. Cases are highlighted to show how the cold- and warm-rolling β textures can be tailored to hinder martensite formation upon subsequent industrial forming operations.

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“…Titanium alloys are extensively used in many applications from biomedical devices to aeronautics, owing to their good strength-to-weight ratio, high corrosion resistance, enhanced hardenability and excellent biocompatibility [1][2][3][4]. Focusing on metallic biomaterials, much effort has been devoted to investigating the β titanium alloys made of nontoxic elements [5][6][7][8], especially employing Mo alloying element [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, thermo-mechanical properties and Portevin-Le Chatelier effect in metastable β Ti-xMo alloys

Luo

Castany

Thuillier

2019

Materials Science and Engineering: A

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The microstructure, mechanical properties and Portevin-Le Chatelier (PLC) effect in Ti-xMo alloys (x=10, 12, 15 and 18 wt%), in the temperature range of 250-350 °C with strain rates from 10-3 s-1 to 10-4 s-1 , are systematically investigated in tension by using transmission electron microscopy and Gleeble 3500 testing machine combined with a digital image correlation technique. Results show that Young modulus decreases with increasing Mo contents, which is related to a more stable β phase matrix and a decrease of ω phase fraction. Moreover, the values of Young modulus and 0.2% offset yield strength at elevated temperature are higher than the ones at room temperature in all the Ti-xMo alloys, except the Ti-18Mo alloy which shows an opposite result. These macroscopic features are consistent with the ω phase precipitation in deformed Ti-xMo alloys, due to the combined effects of ω phase strengthening and temperature softening. Furthermore, the serration type transforms from A to A+B, then to B and eventually to C as increasing temperature and decreasing strain rate as well as Mo contents, which mainly depends on the spatial cohesion of PLC bands influenced by the intensity of ω precipitate-dislocation interactions. Finally, the peak value of maximum stress drop magnitude appears in Ti-12Mo alloy and increases with decreasing the strain rate, which is attributed to a stronger intensity of ω precipitate-dislocation interactions caused by reducing dislocations movement and

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Design of strain-transformable titanium alloys

Cited by 39 publications

References 72 publications

Microstructural Evolution and Strain-Hardening in TWIP Ti Alloys

Microstructural Evolution and Strain-Hardening in TWIP Ti Alloys

Predicting the available work from deformation-induced α′′ martensite formation in metastable β Ti alloys

Microstructure, thermo-mechanical properties and Portevin-Le Chatelier effect in metastable β Ti-xMo alloys

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