Evolution of ω phase during heating of metastable β titanium alloy Ti–15Mo

Zháňal, Pavel; Harcuba, Petr; Hájek, Michal; Smola, Bohumil; Stráský, Josef; Šmilauerová, Jana; Veselý, Jozef; Janeček, Miloš

doi:10.1007/s10853-017-1519-2

Cited by 37 publications

(29 citation statements)

References 40 publications

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“…It was shown that phase transitions in Ti alloys can be detected by means of electrical resistance measurement that is particularly sensitive to evolution of ω phase particles [15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Fig.…”

Section: Electrical Resistance Measurementsmentioning

confidence: 99%

“…The values are presented only in the temperature interval of 445 • C -550 • C. Bellow this temperature, ω particles were too close to each other and the peaks corresponding to these distances were outside of the detector. With the increasing temperature the diffraction maxima approached center of the detector and at temperatures above 550 • C hid behind the beamstop and subsequently disappeared due to dissolution of ω phase at 560 • C [28,30].…”

Section: Sansmentioning

confidence: 99%

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Evolution of distance between ω particles in metastable β-Ti alloy determined from in-situ small angle neutron scattering

et al. 2020

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The evolution of distance between ω particles in metastable β Ti- 15Mo alloy (8.1 in at. %) was determined from in-situ small angle neutron scat- tering (SANS). SANS data were recorded during heating of the material from room temperature to 600 ◦C with the heating rate of 1 ◦C/min. The results agree with previously determined ordering of ω particles in a cubic three-dimensional array with the axes along the cubic axes ⟨100⟩β of the host lattice. The distance between particles, which increases with temperature, was investigated in three orientations with the incident beam parallel to [100]β, [110]β and [111]β.

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Section: Electrical Resistance Measurementsmentioning

confidence: 99%

Section: Sansmentioning

confidence: 99%

Evolution of distance between ω particles in metastable β-Ti alloy determined from in-situ small angle neutron scattering

et al. 2020

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“…It was shown that phase transitions in Ti alloys can be detected by means of electrical resistance measurement, which is particularly sensitive to evolution of !-phase particles (Yoshida & Tsuya, 1956;Luhman et al, 1968;Ho & Collings, 1972;Hill & Polonis, 1987;Ikeda et al, 1988;Prima et al, 2000;Gloriant et al, 2008;Bruneseaux et al, 2008;Zhá ň al et al, 2015Zhá ň al et al, , 2016Zhá ň al et al, , 2017Zhá ň al et al, , 2018Harcuba et al, 2016;Vá clavová et al, 2017). The Matthiessen rule states that the total resistivity tot ðTÞ at any measured temperature T can be written as the sum of two components tot ðTÞ ¼ 0 þ h ðTÞ, where 0 is the temperature-independent residual (i.e.…”

Section: Electrical Resistancementioning

confidence: 99%

In situ detection of stability limit of ω phase in Ti–15Mo alloy during heating

et al. 2019

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Phase transitions in a single crystal of a metastable β‐titanium alloy (Ti‐15Mo) were investigated in situ during heating by synchrotron X‐ray diffraction. The results were compared with previous measurements of electrical resistance. Single‐crystalline samples allowed different crystallographic families of ω‐Ti and α‐Ti phases to be distinguished. The observed evolution of the intensity of the reflections of the ω phase during heating is consistent with the evolution of electrical resistance, which proves that the resistance is affected by the presence of ω‐phase particles. Between approximately 673 and 833 K, both the resistance and the intensity of ω peaks sharply decrease. At 833 K, ω reflections disappear, indicating a complete dissolution of the ω phase due to achieving the solvus temperature of the ω phase in the Ti–15Mo alloy. The synchrotron X‐ray diffraction experiment proved that the disappearance of the ω phase during heating of Ti–15Mo with a heating rate of 5 K min−1 occurs by its dissolution back to the β phase and not by ω → α transformation.

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“…During cooling after sintering (cf. Figure 1), the Ti-15Mo alloy passes firstly through a region of α-phase precipitation in the temperature region of 750-500 • C [8,36]; and then through a region of ω-phase formation in the range of 450-250 • C [37]. One may therefore assume that ω-phase forms during cooling in the material sintered from the initial powder.…”

Section: Spark Plasma Sinteringmentioning

confidence: 99%

“…During quenching, so-called ω ath (athermal) forms by a displacive transformation. When annealing at temperatures in range 250-450 • C, ω iso (isothermal) forms by a diffusional transformation [8]. ω-phase also strengthens the material.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Ti-15Mo Alloy Prepared by Cryogenic Milling and Spark Plasma Sintering

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Kozlík

Bartha

et al. 2019

Metals

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Metastable β-Ti alloy Ti-15Mo was prepared by cryogenic ball milling in a slurry of liquid argon. Material remained ductile even at low temperatures, which suppressed particle refinement, but promoted intensive plastic deformation of individual powder particles. Repetitive deformation of powder particles is similar to the multidirectional rolling and resembles bulk severe plastic deformation (SPD) methods. Initial and milled powders were compacted by spark plasma sintering. Sintered milled powder exhibited a refined microstructure with small β-grains and submicrometer sized α-phase precipitates. The microhardness and the yield tensile strength of the milled powder after sintering at 850 °C attained 350 HV and 1200 MPa, respectively. Low ductility of the material can be attributed to high oxygen content originating from the cryogenic milling. This pioneering work shows that cryogenic milling followed by spark plasma sintering is able to produce two-phase β-Ti alloys with refined microstructure and very high strength levels.

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Evolution of ω phase during heating of metastable β titanium alloy Ti–15Mo

Cited by 37 publications

References 40 publications

Evolution of distance between ω particles in metastable β-Ti alloy determined from in-situ small angle neutron scattering

Evolution of distance between ω particles in metastable β-Ti alloy determined from in-situ small angle neutron scattering

In situ detection of stability limit of ω phase in Ti–15Mo alloy during heating

Mechanical Properties of Ti-15Mo Alloy Prepared by Cryogenic Milling and Spark Plasma Sintering

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