<i>In situ</i>study of the continuous cooling transformation behaviour of Ti–Al alloys within the two-phase (α + γ) region

Kim, J. S.; Park, J. K.; Chun, Chang-Hwan; Kim, G. H.

doi:10.1080/01418610108217136

Cited by 4 publications

(1 citation statement)

References 10 publications

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“…perature real-time measurement apparatus, [7,8] which was Thin foils for transmission electron microscopy (TEM) modified to operate under high vacuum. observation were prepared using a jet electrolytic polisher in a solution of 10 pct perchloric acid and 90 pct methanol.…”

Section: Introductionmentioning

confidence: 99%

In-situ measurement of continuous cooling β → α transformation behavior of CP-Ti

Park

2002

Metall Mater Trans A

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The ␤ → ␣ transformation kinetics of CP-Ti during continuous cooling was measured using a fully computer-controlled resistivity-temperature real-time measurement apparatus. Unlike the pure Ti case, the massive transformation occurs at medium cooling rates, about 90 ЊC/s to 600 ЊC/s. Its start temperature is estimated to be about 890 ЊC, which is close to the T 0 temperature. The reason for the appearance of massive transformation in CP-Ti is because CP-Ti contains a significant amount of Fe as an impurity, which leads to the T 0 (␤ → ␣ ) vs composition curve being parallel to the composition axis due to its retrograde solubility. The martensitic transformation starts to occur at a cooling rate of about 500 ЊC/s, which is much slower than that (about 3000 ЊC/s) reported in a pure Ti case. This retardation effect of martensitic transformation is also believed to arise from the presence of Fe in CP-Ti, which is a strong ␤ stabilizer.

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Section: Introductionmentioning

confidence: 99%

In-situ measurement of continuous cooling β → α transformation behavior of CP-Ti

Park

2002

Metall Mater Trans A

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In-situ study on γ phase transformation behaviour of γ-TiAl alloys at different cooling rates

Luo

et al. 2022

Progress in Natural Science: Materials International

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Effect of Cr and Si additions on the continuous-cooling-transformation kinetics of γ-based Ti–45 at.% A1 alloy

Lee

Park

2001

Philosophical Magazine A

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The eOE ect of Cr and Si additions on the continuous-cooling-transformation (CCT) kinetics of Ti45Al alloy has been studied at cooling rates from about 0.5 to 5008C s ¡1 using our recently constructed in-situ real-time resistivity±temperature measurement apparatus. The a ! g L lamellar reaction occurs at slow cooling rates and only the a ! a 2 ordering reaction occurs at fast cooling rates; no massive reaction occurs at intermediate cooling rates. The addition of Cr results in a simple decrease in the reaction temperatures for the a ! g L lamellar reaction without a change in the critical cooling rate for the ordering reaction only, in partial agreement with the depression of the a transus temperature. The ordering start temperature was measured to be slightly higher. The addition of Si, on the other hand, signi®cantly accelerates the kinetics of a ! g L lamellar reaction by shifting its CCT curve towards a higher temperature and a shorter time. This is because silicides formed at high temperatures on grain boundaries raise the g-phase nucleation temperature and also because Si enhances its growth rate, probably by increasing the chemical diOE usivity of a phase. The addition of Cr to a Si-containing Ti±45 at.% Al alloy signi®cantly re®nes its lamellar spacing either by suppressing the Si segregation to grain boundaries or by reducing the a g interfacial energy. The antiphase domain size in the a 2 phase is distinctively small in the Si-containing alloy probably owing to its interfacial segregation tendency.

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In situstudy of the continuous cooling transformation behaviour of Ti–Al alloys within the two-phase (α + γ) region

Cited by 4 publications

References 10 publications

In-situ measurement of continuous cooling β → α transformation behavior of CP-Ti

In-situ measurement of continuous cooling β → α transformation behavior of CP-Ti

In-situ study on γ phase transformation behaviour of γ-TiAl alloys at different cooling rates

Effect of Cr and Si additions on the continuous-cooling-transformation kinetics of γ-based Ti–45 at.% A1 alloy

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