A new multi-element beta titanium alloy with a high yield strength exhibiting transformation and twinning induced plasticity effects

Sadeghpour, Saeed; Abbasi, S.M.; Morakabati, M.; Kisko, A.; Karjalainen, L.P.; Porter, David

doi:10.1016/j.scriptamat.2017.10.017

Cited by 106 publications

(29 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Instead, a positive effect is expected regarding the evolution of the yield stress, consistently with what observed on the presented stress-strain curves (Figure 3) and with results from the literature for TRIP/TWIP Ti-alloys [see, e.g. (Sadeghpour et al, 2018;Ren et al, 2020)].…”

Section: Toward Complementary Parameters In the Design Methods Of Tripsupporting

confidence: 91%

“…For a few years, strain-transformable titanium alloys have attracted a lot of attention, thanks to their specific mechanical properties, allowing a breakthrough from usual β-metastable titanium alloys mechanical properties (Marteleur et al, 2012;Sun et al, 2013;Brozek et al, 2016;Gao et al, 2018;Ren et al, 2018;Sadeghpour et al, 2018;Lilensten et al, 2019). The combination of Transformation Induced Plasticity (TRIP) and Twinning Induced Plasticity (TWIP) effects is now known to lead to a drastic improvement of both strain-hardening and ductility compared to "classical" titanium alloys.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Influence of Twinning on the Strain–Hardenability in TRIP/TWIP Titanium Alloys: Role of Solute–Solution Strengthening

et al. 2020

View full text Add to dashboard Cite

Transformation Induced Plasticity and Twinning Induced Plasticity (TWIP) titanium alloys are well-known to display a good combination of strain-hardenability and ductility. However, a large range of strain-hardening rates, which cannot be predicted by the actual design method based on electronic parameters, is obtained. In order to explain this wide range of properties, two different alloys displaying a large difference of strain-hardening rates, but similar chemical stability, have been studied and compared: Ti-12Mo and Ti-8.5Cr-1.5Sn (in wt%). Evolution of both twin size and density during in situ tensile tests has been followed by SEM/electron backscatter diffraction mapping, and two distinct behaviors can be highlighted: the growth of existing twins (Ti-12Mo) and the nucleation of new twins (Ti-8.5Cr-1.5Sn) upon loading. The last one may lead to an improvement of the dynamic Hall-Petch effect by multiplication of twin/matrix interfaces, with subsequent improvement of the macroscopic strain-hardening. It is thought that this competition may be related to the crystal lattice distortion induced by the alloying elements and the subsequent reduction of the migration velocity of the twin/matrix interfaces. Impact Statement: This work reports on distinct behaviors of mechanical twins in TRIP/TWIP titanium alloys, highlighting for the first time a competition between growth of existing twins and nucleation of additional twins upon loading. This effect is assumed to be due to the solute-strengthening effect in the studied alloys and modify, as a consequence, the strain-hardenability of the TRIP/TWIP alloys.

show abstract

Section: Toward Complementary Parameters In the Design Methods Of Tripsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

The Influence of Twinning on the Strain–Hardenability in TRIP/TWIP Titanium Alloys: Role of Solute–Solution Strengthening

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Upon increasing the strain to 0.10 and to 0.15, the multiplication and growth of both variants are clearly noticed in Figure 2(b,c). It is worth noting that SIM transformation was not observed during the whole plastic deformation, indicating that the TRIP effects was fully suppressed due to the higher stability of this alloy when compared with the combined TWIP and/or TRIP modes Ti-alloys [7][8][9][10]13,17]. The role of the SIM-produced α is likely to relax the zones where strong stress concentration occurs (typically at the crossing zone of twins).…”

mentioning

confidence: 92%

“…On the other hand, the {332} < 113 > twinning, which usually displays higher CRSS (critical resolved shearing stress) than SIM, leads to significant strain-hardening by dynamic Hall-Petch effect by reducing the mean free path of dislocation slip in BCC grains [6]. Recently, considerable efforts have been dedicated to developing a new family of β Tialloys [7][8][9][10][11] by combining twinning and SIM effects, i.e. the hybrid TWIP/TRIP effects (TWIP: twinninginduced plasticity, TRIP: transformation-induced plasticity), that generally display low yield strength (YS), large uniform elongation and high strain-hardening rate [9].…”

mentioning

confidence: 99%

Strong and ductile beta Ti–18Zr–13Mo alloy with multimodal twinning

Zhang

Sun

Zheng

et al. 2019

Materials Research Letters

View full text Add to dashboard Cite

Body-centred cubic (BCC) Ti-18Zr-13Mo (wt%) alloy displays excellent yield strength (≈ 800 MPa), stable hardening (rate > 1500 MPa) and uniform ductility > 18%, resulting from multi-TWIP (multiple twinning-induced plasticity) strengthening effect. This multimodal mechanisms include microscale {332} < 113 > deformation twinning (DT), nano-scale {112} < 111 > DT and a rare {5 8 11} < 135 > DT mode. Martensitic phase transformation is completely suppressed and the sample stays a single-phase solid solution throughout the deformation. In situ electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) were used to characterize the multi-TWIP and dynamic Hall-Patch effect, with dislocation slip and large grain distortions at twin interfaces. IMPACT STATEMENT The addition of Zr solutes stabilizes β Ti-alloy and completely suppresses phase transformations, allowing {332} < 113 > , {112} < 111 > and {5 8 11} < 135 > multimodal twinning to give a better combination of strength, strain-hardening rate and ductility.

show abstract

“…new area of applica ons for tanium alloys in aerospace, for instance for components with increased capability to endure damage. Over the last few years, several new TRIP/TWIP tanium alloys have been developed and reported in the literature [2][3][4][5][6][7][8][9][10][11][12]. However, their yield stress generally remains rather low (typically below 600MPa) [2][3][4][5][6]16].…”

mentioning

confidence: 99%

Strain-hardenability of new strengthened TRIP/TWIP titanium alloys

et al. 2020

View full text Add to dashboard Cite

A new Ti-Cr based alloy has been developed to reach a TWIP (TWinning Induced Plasticity) effect as the main deformation mechanism. This new composition, involving Fe addition, was derived from a classical TRIP/TWIP alloy Ti-8.5Cr-1.5Al (wt%) (TCA). The main objective is to achieve an optimized strength/hardenability combination by limiting the TRIP (TRansformation Induced Plasticity) effect whose critical resolved shear stress lowers the plasticity threshold. This new alloy Ti-7Cr-1Al-xFe (wt%) (TCAF) displays excellent mechanical properties, with an increased yield strength (with respect to TCA alloy), a very high work-hardening rate and an extremely high fracture strength (UTS=1415MPa), while maintaining an excellent ductility (ε=0.38 at fracture). Both mechanical (tensile tests) and microstructural characterization at different scales (EBSD, XRD) have been performed, evidencing a dense network of fine {332}<113> mechanical twins as well as the presence of stress-induced martensite plates at twins intersections, as a secondary mechanism.

show abstract

A new multi-element beta titanium alloy with a high yield strength exhibiting transformation and twinning induced plasticity effects

Cited by 106 publications

References 28 publications

The Influence of Twinning on the Strain–Hardenability in TRIP/TWIP Titanium Alloys: Role of Solute–Solution Strengthening

The Influence of Twinning on the Strain–Hardenability in TRIP/TWIP Titanium Alloys: Role of Solute–Solution Strengthening

Strong and ductile beta Ti–18Zr–13Mo alloy with multimodal twinning

Strain-hardenability of new strengthened TRIP/TWIP titanium alloys

Contact Info

Product

Resources

About