Experimental evidence of concurrent compositional and structural instabilities leading to ω precipitation in titanium–molybdenum alloys

Devaraj, Arun; Nag, S.; Srinivasan, Raghavan; Williams, R. E. A.; Banerjee, S.; Banerjee, Rajarshi; Fraser, Hamish L.

doi:10.1016/j.actamat.2011.10.008

Cited by 268 publications

(134 citation statements)

References 33 publications

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“…The detailed inspection of electron diraction patterns revealed the extra spots corresponding to the ω-phase [8] and conrmed the orientation relationship between the hexagonal ω and bcc grains [15], see Fig. 1:…”

Section: Resultsmentioning

confidence: 88%

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Phase Transformations in Ti-15Mo Investigated by in situ Electrical Resistance

et al. 2015

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In this study phase transformations in metastable beta Ti15Mo alloy were investigated by an in situ electrical resistance measurement in a wide range of temperatures from 196• C to 850• C. Dierent temperature ranges of the evolution of electrical resistance were correlated with underlying phase transformations. In the low temperature range, stage I (from 196• C to 220• C) the decrease of electrical resistance with increasing temperature is caused by the dissolution of ω ath (formed during quenching by athermal shue transformation) which is accompanied by the relaxation of lattice strain, while the diusional assisted growth of ωiso in the range from 220 • C was conrmed by temperature cycling during repeated in situ resistance runs from RT. Pre-ageing of samples at 300• C promotes the formation of ωiso particles. Subsequently, ω ath particles are not created, which is fully consistent with electrical resistance measurements. The presence of ω ath and the orientation relationship between ω and β were identied by the electron diraction.

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Section: Resultsmentioning

confidence: 88%

“…Particles ω iso grow during annealing and become more chemically stabilized i.e. they dier from surrounding β-matrix in composition [8]. Upon further annealing (around 500…”

mentioning

confidence: 99%

Phase Transformations in Ti-15Mo Investigated by in situ Electrical Resistance

et al. 2015

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“…%) alloy [137]. The bcc β-phase to embryonic ω-phase transformation was recently clarified to occur through a displacive-diffusional process [138][139][140]. These authors demonstrated that the formation of ω-phase-like embryos occurred through competing compositional and structural instabilities arising in the bcc lattice of model binary Ti-Mo alloys during rapid cooling from the high-temperature single β-phase field.…”

Section: Agingmentioning

confidence: 99%

A Review of Metastable Beta Titanium Alloys

Kolli

Devaraj

2018

Metals

462

175

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Abstract:In this article, we provide a broad and extensive review of beta titanium alloys. Beta titanium alloys are an important class of alloys that have found use in demanding applications such as aircraft structures and engines, and orthopedic and orthodontic implants. Their high strength, good corrosion resistance, excellent biocompatibility, and ease of fabrication provide significant advantages compared to other high performance alloys. The body-centered cubic (bcc) β-phase is metastable at temperatures below the beta transus temperature, providing these alloys with a wide range of microstructures and mechanical properties through processing and heat treatment. One attribute important for biomedical applications is the ability to adjust the modulus of elasticity through alloying and altering phase volume fractions. Furthermore, since these alloys are metastable, they experience stress-induced transformations in response to deformation. The attributes of these alloys make them the subject of many recent studies. In addition, researchers are pursuing development of new metastable and near-beta Ti alloys for advanced applications. In this article, we review several important topics of these alloys including phase stability, development history, thermo-mechanical processing and heat treatment, and stress-induced transformations. In addition, we address recent developments in new alloys, phase stability, superelasticity, and additive manufacturing.

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“…It is reported that the w lattice is obtained by the collapse of one pair of (111) [36][37][38]. A transmission electron microscopy investigation of Ti-(18-22)V [wt.%] alloys revealed that the intensities of the w reflections in the Ti-20 V alloy were much weaker than those in Ti-18 V alloy, and the w reflections in the Ti-22 V alloy disappeared, suggesting that formation of the w phase becomes difficult as the stability of the b phase increases [39].…”

Section: Resultsmentioning

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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Experimental evidence of concurrent compositional and structural instabilities leading to ω precipitation in titanium–molybdenum alloys

Cited by 268 publications

References 33 publications

Phase Transformations in Ti-15Mo Investigated by in situ Electrical Resistance

Phase Transformations in Ti-15Mo Investigated by in situ Electrical Resistance

A Review of Metastable Beta Titanium Alloys

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

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