Effects of &amp;omega; Phase Formation on Decomposition of &amp;alpha;&amp;Prime;&amp;frasl;&amp;beta; Duplex Phase Structure in a Metastable &amp;beta; Ti Alloy

Ohmori, Yasuya; Natsui, Hiroshi; Nakai, Kenta; Ohtsubo, Hiroyuki

doi:10.2320/matertrans1989.39.40

Cited by 19 publications

(17 citation statements)

References 13 publications

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“…The ω particles are dispersed homogeneously in β phase. Such a precipitation of ω phase 14,26, has also been observed in the alloys of titanium with several other transition elements. Since the aging temperature at 600…”

Section: Tem Observationsmentioning

confidence: 58%

“…They are confirmed to be α martensite from the diffraction pattern in (d). In titanium alloys two types of martensitic phase α [12][13][14] and α 11,[15][16][17][18][19][20][21][22][23][24][25][26][27] could be observed. With increasing in β-stabilized element such as Nb, Ta, and V, α rather than α is prefer to be formed during quenching from β phase field.…”

Section: Tem Observationsmentioning

confidence: 99%

“…These relationships are also in good agreement with the results reported. 15,26) Figure 7 shows (α + Figure 10 shows the phase diagram of Ti-Nb-Zr ternary alloy at 600…”

Section: Tem Observationsmentioning

confidence: 99%

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Phase Decomposition in a Ti-13Nb-13Zr Alloy during Aging at 600°C

et al. 2002

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Phase decomposition in a Ti-13 mass%Nb-13 mass%Zr alloy during isothermal aging at 600 • C has been investigated by means of transmission electron microscopy and Vickers hardness measurements. Specimens solution-treated at 1000 • C in β phase field were quenched and aged at 600 • C in (α + β) region. Beta phase was fully transformed into martensitic α laths by quenching from 1000 • C. Formation of β phase on tempered α lath interfaces occurred during aging. Early in the stage of aging, β phase transformed into α martensite completely by quenching. As increasing in aging time, athermal ω phase was formed in β phase by quenching. Beta phase was stabilized by prolonged aging. Enrichment of Nb content into β phase occurred with increasing in aging time, resulting in the formations of athermal ω phase and (α + β) two-phase structure. The hardness increased with the ω phase formation in β phase, followed by the decrease of hardness due to suppression of ω phase formation induced by enrichment of Nb in β phase.

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Section: Tem Observationsmentioning

confidence: 58%

Section: Tem Observationsmentioning

confidence: 99%

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Phase Decomposition in a Ti-13Nb-13Zr Alloy during Aging at 600°C

et al. 2002

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“…phase in a Ti-10V-2Fe-3Al alloy. 22) On the other hand, the increase in resistivity is attributed to the fluctuation of the concentration of alloying elements such as G.P. zone or spinodal decomposition 23) although there is no clear evidence in titanium alloys at the present time.…”

Section: Discussionmentioning

confidence: 59%

Effect of Cooling Rate on Superelasticity and Microstructure Evolution in Ti-10V-2Fe-3Al and Ti-10V-2Fe-3Al-0.2N Alloys

Tomio

Maki

2009

Mater. Trans.

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A Ti-10V-2Fe-3Al alloy with a small amount of nitrogen shows superelasticity. Controlling of the cooling rate from solution treatment temperature improves superelasticity in both Ti-10V-2Fe-3Al and Ti-10V-2Fe3-Al-0.2N alloys. In this study, a wider range of the cooling rate was examined and microstructure change during slow cooling was investigated through examining quenched and aged specimens by means of hardness and resistivity measurement and transmission electron microscopy. Although superelasticity is improved with a decrease in the cooling rate up to 22 K/s for the N-free alloy and up to 50 K/s for the 0.2N alloy, there is no obvious change in microstructure. It is clarified from the observation of specimens quenched and aged at the temperature range where superelasticity is improved that the phase decomposition occurs through isothermal ! phase precipitation. Therefore, microstructure evolution during slow cooling is considered to be precipitation of isothermal ! phase or its precursor phenomena.

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“…17,18) However, in Ti-Zr based alloy system containing Nb, no athermal ½ phase was detected from XRD results.…”

Section: Phase Constitution Change With Nb Additionmentioning

confidence: 99%

Influence of Nb Addition on Phase Constitution and Mechanical Properties of Biomedical Ti-Zr Based Alloys

2015

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The influence of Nb addition on phase constitution, microstructure and mechanical properties of biomedical equi-atomic Ti-Zr based alloys was investigated. Phase constitution of Ti-Zr based alloys containing Nb rapidly cooled from ¢ single phase changed with Nb addition as follows:Young's moduli of Ti-Zr based alloys subjected to water quenching initially decreased with increasing Nb content. The minimal value was obtained in the Ti-48Zr-4Nb (mol%) composition alloy. The Young's moduli increased in relation to the phase constitution change. In the alloys containing over 4% Nb, their principal phase was changed by subsequent cold rolling, this is mainly because ¢ ¼ ¡A and ¢ ¼ ¡AA stress-induced martensitic transformation occurred. This phase transformation resulted in a decrease of Young's modulus. Furthermore, cold rolling impartd anisotropy to the Young's modulus which caused the value to drop. The Ti-47Zr-6Nb alloy had the lowest value of Young's modulus after cold rolling in this study, 59.5 GPa.

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Effects of ω Phase Formation on Decomposition of α″&frasl;β Duplex Phase Structure in a Metastable β Ti Alloy

Cited by 19 publications

References 13 publications

Phase Decomposition in a Ti-13Nb-13Zr Alloy during Aging at 600°C

Phase Decomposition in a Ti-13Nb-13Zr Alloy during Aging at 600°C

Effect of Cooling Rate on Superelasticity and Microstructure Evolution in Ti-10V-2Fe-3Al and Ti-10V-2Fe-3Al-0.2N Alloys

Influence of Nb Addition on Phase Constitution and Mechanical Properties of Biomedical Ti-Zr Based Alloys

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Effects of &omega; Phase Formation on Decomposition of &alpha;&Prime;&frasl;&beta; Duplex Phase Structure in a Metastable &beta; Ti Alloy

Cited by 19 publications

References 13 publications

Phase Decomposition in a Ti-13Nb-13Zr Alloy during Aging at 600&deg;C

Phase Decomposition in a Ti-13Nb-13Zr Alloy during Aging at 600&deg;C

Effect of Cooling Rate on Superelasticity and Microstructure Evolution in Ti-10V-2Fe-3Al and Ti-10V-2Fe-3Al-0.2N Alloys

Influence of Nb Addition on Phase Constitution and Mechanical Properties of Biomedical Ti-Zr Based Alloys

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Effects of ω Phase Formation on Decomposition of α″&frasl;β Duplex Phase Structure in a Metastable β Ti Alloy

Phase Decomposition in a Ti-13Nb-13Zr Alloy during Aging at 600°C

Phase Decomposition in a Ti-13Nb-13Zr Alloy during Aging at 600°C