Effect of Applied Stress on Formation of &amp;omega;-Phase in &amp;beta;-Ti Alloys

Nishizawa, H.; Sukedai, Eiichi; Liu, W.; Hashimoto, H.

doi:10.2320/matertrans1989.39.609

Cited by 24 publications

(9 citation statements)

References 16 publications

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“…4(c) and (d), larger particles are visible, and it has been confirmed that they are !-phase (athermal !-phase) structure particles by means of HREM method. 6) These results suggest that to ! phase transformations do not occur at 0.5 GPa pressurizing, but instead occurs at 0.7 GPa pressurizing.…”

Section: )mentioning

confidence: 80%

Nucleation Behaviour of β to ω Phase Transformations in β-Type Ti-Mo Alloys

et al. 2011

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Nucleation behaviour of to ! phase transformations in -type Ti alloys has been investigated using electron microscopy in four cases; (1) along the f112gh11 " 1 1i twin boundary, at which compressive stress occurs, (2) by means of aging under tensile stressing, (3) on the effects on the amounts of quenched-in vacancy in specimens quenched-in from two different temperatures, and (4) due to cooling to 131 K. Results show that the formation of nucleation-sites is enhanced by both compressive-stress along the twin boundary and tensile-stress during aging. In a specimen quenched from a higher temperature, the formation of nucleation-sites increases. It is considered that quenched-in vacancies and their clusters become nucleation-sites of to ! phase transformations. The phase transformation occurs due to cooling to 131 K. It is also found that the formation of new nucleation-sites cannot be reproduced and that they moved randomly.

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Section: )mentioning

confidence: 80%

Nucleation Behaviour of β to ω Phase Transformations in β-Type Ti-Mo Alloys

et al. 2011

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“…Previous to this work, Nishizawa et al [8] investigated the effect of an applied stress on the nucleation of ω phase in the Ti-20Mo alloy aged at 350°C, and showed that a tensile stress applied during ageing promotes the nucleation of ω phase. We have found that application of a tensile stress of 400MPa during ageing the same alloy at 350°C…”

Section: Growth Kineticsmentioning

confidence: 99%

“…It is widely known that application of an elastic stress during the ageing process of many age-hardenable alloy systems significantly affects the resulting microstructures, in particular the distribution of strengthening precipitates [1][2][3][4][5][6][7][8][9][10]. Particularly, for Al-Cu alloys, the effect of directional stress on the orientation distribution of precipitate structures has been invetigated extensively [2,5,7,9].…”

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confidence: 99%

Stress-assisted nucleation and growth of γ″ and γ′ precipitates in a Cu–1.2 wt%Be–0.1 wt%Co alloy aged at 320°C

Monzen

Okawara

Watanabe

2012

Philosophical Magazine

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“…Since the size of 8 Mo atoms is smaller than that of Ti atoms, the increase in Mo atoms within the β-Ti matrix causes the decrease in the lattice parameter. The lattice parameter of the TSA-FA specimen decreases more rapidly than that of the FA-FA specimen, although eventually the lattice parameters of both specimens converge on the same value of 0.3232 nm.…”

Section: °Cmentioning

confidence: 99%

“…In order to evaluate the effect of an applied tensile stress on the nucleation of ω precipitated phase in Ti-20Mo alloy specimens aged at 350°C, Nishizawa et al [8] have measured the number of ω precipitates in constant areas in the stress-free and stress-aged specimens, and concluded that a tensile stress applied during aging promotes the nucleation of ω precipitates. The structure of the ω phase in an aged Ti-14Mo alloy is hexagonal with a=0.2820 nm and c=0.4606 nm [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of external stress on nucleation of ellipsoidal ω precipitates in a Ti–20 wt% Mo alloy

2014

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The effects of an external stress on the formation of ellipsoidal ω phase precipitates have been examined for a Ti-20wt%Mo alloy aged at 300°C. Application of a tensile stress accelerates the nucleation of ω precipitates but a compressive stress does not significantly affect it. Estimates of the average misfit strains along the loading and the transverse directions, based on the misfit strains of ω precipitates, from measurements of the length change and the lattice parameter reveal preferential formation of specific ω variants among crystallographically-equivalent four ones, which depends on the sense of the applied stress. This is supported by the result of the dependence of the number density of an ω variant on its misfit strain along the loading direction. This result, together with the dependence of the formation of ω precipitates on the sense of the applied stress, can be well understood through the interaction energy due to the presence of misfit strains between the applied stress and ω precipitate.

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Effect of Applied Stress on Formation of ω-Phase in β-Ti Alloys

Cited by 24 publications

References 16 publications

Nucleation Behaviour of β to ω Phase Transformations in β-Type Ti-Mo Alloys

Nucleation Behaviour of β to ω Phase Transformations in β-Type Ti-Mo Alloys

Stress-assisted nucleation and growth of γ″ and γ′ precipitates in a Cu–1.2 wt%Be–0.1 wt%Co alloy aged at 320°C

Effect of external stress on nucleation of ellipsoidal ω precipitates in a Ti–20 wt% Mo alloy

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Effect of Applied Stress on Formation of &omega;-Phase in &beta;-Ti Alloys

Cited by 24 publications

References 16 publications

Nucleation Behaviour of &beta; to &omega; Phase Transformations in &beta;-Type Ti-Mo Alloys

Nucleation Behaviour of &beta; to &omega; Phase Transformations in &beta;-Type Ti-Mo Alloys

Stress-assisted nucleation and growth of γ″ and γ′ precipitates in a Cu–1.2 wt%Be–0.1 wt%Co alloy aged at 320°C

Effect of external stress on nucleation of ellipsoidal ω precipitates in a Ti–20 wt% Mo alloy

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Effect of Applied Stress on Formation of ω-Phase in β-Ti Alloys

Nucleation Behaviour of β to ω Phase Transformations in β-Type Ti-Mo Alloys

Nucleation Behaviour of β to ω Phase Transformations in β-Type Ti-Mo Alloys