The thermodynamics and kinetics of the β → αm transformation in three Ti-X systems

Plichta, M.R.; Aaronson, H.I.; Perepezko, John H.

doi:10.1016/0001-6160(78)90014-7

Cited by 83 publications

(39 citation statements)

References 14 publications

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“…The shape of this phase field resembles a previous result, which described the Ti 5 Si 3 phase as Ti 3 Ti 2 (Ti,Si) 3 . Figure 2-b shows a detail of the Ti-rich corner near the eutectoid reaction, comparing the present assessment with previous experimental (Plitcha et al 1977;Plitcha and Aaronson, 1978) and calculated (Cost, 1998;Fiore et al 2016) phase diagrams. The present assessment showed smaller Si-solubility in the Ti(α) and Ti(β) phases when compared to the calculated phase diagram using COST 507 database (Cost, 1998) and a slightly higher value for the eutectoid temperature.…”

Section: Resultssupporting

confidence: 70%

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Assessment of the Ti-rich corner of the Ti-Si phase diagram using two sublattices to describe the Ti5Si3 phase

2017

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The thermodynamic optimization of Ti-X-Si systems requires that their respective binary systems be constantly updated. The most recent assessments of the Ti-Si phase diagrams used three sublattices to describe the Ti 5 Si 3 phase. The stable version of this phase diagram indicated the presence of Ti(β)+Ti 5 Si 3 →Ti 3 Si and Ti(β)→Ti(α)+Ti 3 Si reactions in the Ti-rich corner, while the metastable version featured the presence of a Ti(β)→Ti(α)+Ti 5 Si 3 reaction. The present investigation assessed these phase diagrams using two sublattices to describe the Ti 5 Si 3 phase in order to simplify the optimization of Ti-X-Si systems.

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Section: Resultssupporting

confidence: 70%

“…In late 70´s, however, careful investigations of the eutectoid reaction of the Ti-Si system were performed without showing any evidence on the presence of the Ti 3 Si phase (Plitcha et al 1977;Plitcha and Aaronson, 1978). They confirmed instead the presence of Ti 5 Si 3 phase at 1148K, Ti(β) → Ti(α) + Ti 5 Si 3 .…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Ti-rich corner of the Ti-Si phase diagram using two sublattices to describe the Ti5Si3 phase

2017

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“…In 1977 and 1978 Aaronson et al 6,7 investigated the eutectoid reaction of the Ti-rich corner of the Ti-Si system, using continuous cooling experiments, microstructural characterization and microanalysis. Isothermal heat-treatments of homogenized samples were carried out at 1023K for 24 and 120 hours.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Ti-Rich Corner of the Ti-Si Phase Diagram: The Recent Dispute About the Eutectoid Reaction

2016

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The thermodynamic optimization of Ti-Si-X systems requires that their respective binary systems are constantly updated. The Ti-Si system has been experimentally investigated since the 1950s and these critical experimental data can be employed to calculate the Ti-Si phase diagram using thermodynamic modeling. The most recent assessment of the Ti-Si system was performed in 1998, showing the presence of stoichiometric Ti 3 Si as stable phase. In the light of the dispute over the stability of Ti 3 Si phase in the eutectoid reaction of the Ti-Si and Ti-X-Si systems, the present work assessed the Ti-rich corner of the "stable" (featuring Ti 3 Si phase) and "metastable" (featuring Ti 5 Si 3 phase) Ti-Si phase diagrams. The phase boundaries, the values of the error of the least-square method of the optimization procedure and the relative standard deviation of the calculated variables of the assessed diagrams; and previous investigations were discussed in order to inspire further experimental work on the eutectoid reaction of the Ti-Si phase diagram.

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“…It has been reported that eutectoid Ti-Au alloy transform from to a supersaturated solid solution of by a massive transformation. 3,4) Although the details of the observed -transformation is not clear, the transformation from to observed in this work is suggested to occur similarly without long-range diffusion as massive or martensitic transformation. This supersaturated solid solution of is, therefore, termed m in this study.…”

Section: Methodsmentioning

confidence: 65%

Effects of Aging on Phase Constitution, Lattice Parameter and Mechanical Properties of Ti-4 mol%Au Near-Eutectoid Alloy

et al. 2007

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Effects of aging on phase constitution, lattice parameters and mechanical properties of Ti-4 mol%Au near-eutectoid alloy were investigated. The alloy was fabricated by Ar arc-melting method, followed by homogenization at 1273 K for 3.6 ks. The ingot was cold-rolled with 95% reduction in thickness, solution treated at 1173 K for 0.9 ks and quenched into ice water. It was found that the apparent phase after the solution treatment was a supersaturated solid solution of (hcp) phase. This supersaturated -phase is termed m , hereafter. The apparent phase of the aged alloys was m regardless of the aging temperature from 373 to 1073 K for 3.6 ks. The 0.2% flow stress was decreased as the aging temperature increased. On the other hand, by the isothermal aging at 973 K, Ti 3 Au with A15 structure was formed and the volume fraction of Ti 3 Au increased with increasing aging time. The 0.2% flow stress of the materials was decreased as the volume fraction of Ti 3 Au increased. This indicates that the Ti 3 Au precipitations are not effective on strengthening of the Ti-Au alloy.

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The thermodynamics and kinetics of the β → αm transformation in three Ti-X systems

Cited by 83 publications

References 14 publications

Assessment of the Ti-rich corner of the Ti-Si phase diagram using two sublattices to describe the Ti5Si3 phase

Assessment of the Ti-rich corner of the Ti-Si phase diagram using two sublattices to describe the Ti5Si3 phase

Assessment of the Ti-Rich Corner of the Ti-Si Phase Diagram: The Recent Dispute About the Eutectoid Reaction

Effects of Aging on Phase Constitution, Lattice Parameter and Mechanical Properties of Ti-4 mol%Au Near-Eutectoid Alloy

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