On the design of new β-metastable titanium alloys with improved work hardening rate thanks to simultaneous TRIP and TWIP effects

Marteleur, Matthieu; Sun, Fan; Gloriant, T.; Vermaut, P.; Jacques, Pascal; Prima, Frédéric

doi:10.1016/j.scriptamat.2012.01.049

Cited by 315 publications

(175 citation statements)

References 20 publications

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“…Hot deformed alloys are usually softened by dynamic recovery (DRV) and/or by dynamic recrystallization (DRX). During the former, the dislocations formed during deformation are easily annihilated and readily rearranged as arrays, leading to the formation of subgrains with low angle boundaries, whereas new strain-free grains are formed during DRX [24]. It has been reported that since at low strain rate, such as 10 −3 s −1 , the time required for DRV and DRX is adequate, the softening mechanism is predominant [11].…”

Section: Resultsmentioning

confidence: 99%

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Formation of Deformation-Induced Products in a Metastable-β Titanium Alloy during High Temperature Compression

Samiee

Casillas

Ahmed

et al. 2018

Metals

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A metastable-β titanium alloy, Ti-10V-3Fe-3Al (wt. %), was subjected to thermo-mechanical processing including the compression test at 725 • C, which is below the β transus temperature (780 • C), and at strain rate of 10 −3 s −1 . The presence of phases was determined using transmission electron microscopy and X-ray diffraction. Although the dynamic recovery took place together with slip, both deformation-induced α" martensite and ω were detected as other operating mechanisms for the first time in metastable-β titanium alloy deformed in α + β region. The volume fraction of stress-induced α" was higher than that of the same alloy deformed at room temperature due to a higher strain applied. Stress-induced twinning was not operational, which could be related to the priority of slip mechanism at high temperature resulted from thermally-assisted nucleation and lateral migration of kink-pairs.

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Section: Resultsmentioning

confidence: 99%

“…%) [21], β-Cez alloy [22] and Ti-12 Mo (wt. %) [23,24]. Depending on the beta phase stability and stress conditions (strain rate, strain path, etc.…”

Section: Introductionmentioning

confidence: 99%

Formation of Deformation-Induced Products in a Metastable-β Titanium Alloy during High Temperature Compression

Samiee

Casillas

Ahmed

et al. 2018

Metals

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“…The dark region is made of α phase with a thickness of about 4 µm, whereas thin bright region is shown as the β phase. The transformation from the β phase (bcc) to α phase (hcp) can occur along orientation relationship of (110) β //(0002) α and [1][2][3][4][5][6][7][8][9][10][11] β // [11][12][13][14][15][16][17][18][19][20] α .…”

Section: Methodsmentioning

confidence: 99%

“…In addition, its elongation is also improved with similar value to that of the non-treated as-cast, except for the as-quenched specimen at 1323 K. This improvement of strength and ductility by aging for a short time might be because of the TRIP effect of the retained β phase during tensile deformation, as well as microstructure re nement resulted from the decomposition of α martensite to ne α and β phases after aging treatment. 2,8,15) Figure 4 shows the X-ray diffraction patterns of as-cast, ST, and STA specimens. Figure 4 (a) shows the diffraction pattern of as-cast, having the α (hcp) and β (bcc) phases.…”

Section: Microstructurementioning

confidence: 99%

Effect of Retained β Phase on Mechanical Properties of Cast Ti-6Al-4V Alloy

Woo

Kim

et al. 2017

Mater. Trans.

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We investigated effect of retained β phase on mechanical properties of cast Ti-6Al-4V alloy, after solution treatment and subsequent aging for a short time. The alloy was solution-treated at 1123, 1223 K in the α + β phase region and 1323 K in the β phase region for 1800 s, followed by water quenching. After that, as-quenched specimens were aged at 823 K for 300 s. The peak hardness of heat-treated specimens was obtained by solution treatment at each solution temperature and followed by aging at 823 K for 300 s. It was due to ne α phase transformed from the retained β phase. The tensile strength of specimen as-quenched at 1223 K and subsequent aged at 823 K for 300 s was increased, without signi cantly decreased ductility. This was due to the ne α phase transformed from the retained β phase by subsequent aging for 300 s. This behavior of increased strength without dramatically decreased ductility might be caused by the transformation induced plasticity (TRIP) effect, which is the strain-induced martensite transformation from the retained β phase throughout deformation, even after aging at 823 K for 300 s.

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“…For a metal to be used as a biomaterial, high ductility is desirable to minimize the risk of breakage. The b-type titanium alloys were found to possess higher ductility than a-type titanium alloys because a range of deformation modes including phase transformation, twinning, and/or dislocation slip can be activated simultaneously during deformation [15][16][17][18]. Hence, adding b-phase stability elements, such as iron, tantalum, niobium, and molybdenum, to the binary titanium-zirconium alloy to obtain b-type titanium alloys may be a viable way to improve the ductility.…”

Section: Introductionmentioning

confidence: 99%

Microstructures and mechanical properties of as‐cast titanium–zirconium–molybdenum ternary alloys

Yang

Wang

Shi

et al. 2018

Materialwissenschaft Werkst

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In this study titanium-zirconium-molybdenum alloys (Ti 50 Zr 50 ) 100-x Mo x (xMo; x = 0 at.%, 1 at.%, 3 at.%, 5 at.% or 7 at.%) were investigated, focusing on the effect of molybdenum addition on their microstructures and mechanical properties. Transmission electron microscopy observations revealed that the binary Ti 50 Zr 50 alloy was composed entirely of an acicular hexagonal structure of the a' phase. When the molybdenum content was 1 at.%, the alloy was composed of b and w phases. However, when 3 at.% or more molybdenum was added, only the equiaxed, retained b phase was observed. Tensile tests at room temperature indicated that the mechanical properties of the 1Mo alloy were inferior owing to the embrittlement effects of the w phase and the difficulty of dislocation motion through the w phase. Our research suggested that the 5Mo alloy had excellent ductility (16.5 %) as well as adequate strength (780 MPa). The improved mechanical properties were attributed to the enhanced stability of the b phase and the disappearance of the w phase.

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On the design of new β-metastable titanium alloys with improved work hardening rate thanks to simultaneous TRIP and TWIP effects

Cited by 315 publications

References 20 publications

Formation of Deformation-Induced Products in a Metastable-β Titanium Alloy during High Temperature Compression

Formation of Deformation-Induced Products in a Metastable-β Titanium Alloy during High Temperature Compression

Effect of Retained β Phase on Mechanical Properties of Cast Ti-6Al-4V Alloy

Microstructures and mechanical properties of as‐cast titanium–zirconium–molybdenum ternary alloys

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