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In Situ Analysis of the Phase Transformation Kinetics in the β-Water-Quenched Ti-5Al-5Mo-5V-3Cr-1Zr Alloy during Ageing after Fast Heating

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Department of Materials Engineering, São Carlos School of Engineering, University of São Paulo, Av. João Dagnone, 1100, 13563-120 São Carlos, SP, Brazil
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Institute of Materials Science, Joining and Forming, Graz University of Technology, Kopernikusgasse 24, 8010 Graz, Austria
3
Department of Materials Science and Engineering, Saarland University, Campus D3.3, 66123 Saarbrücken, Germany
*
Author to whom correspondence should be addressed.
Quantum Beam Sci. 2020, 4(1), 12; https://doi.org/10.3390/qubs4010012
Received: 31 October 2019 / Revised: 13 January 2020 / Accepted: 11 February 2020 / Published: 21 February 2020
Thermal treatments are the main route to achieve improvements in mechanical properties of β-metastable titanium alloys developed for structural applications in automotive and aerospace industries. Therefore, it is of vital importance to determine phase transformation kinetics and mechanisms of nucleation and precipitation during heat treatment of these alloys. In this context, the present paper focuses on the assessment of solid-state transformations in a β-water-quenched Ti-5Al-5Mo-5V-3Cr-1Zr alloy during the early stages of ageing treatment at 500 °C. In situ tracking of transformations was performed using high-energy synchrotron X-ray diffraction. The transformation sequence β + ω → α + α”iso + β is proposed to take place during this stage. Results show that isothermal α” phase precipitates from ω and from spinodal decomposition domains of the β phase, whereas α nucleates from ω, β and also from α” with different morphologies. Isothermal α” is considered to be the regulator of transformation kinetics. Hardness measurements confirm the presence of ω, although this phase was not detected by X-ray diffraction during the in situ treatment. View Full-Text
Keywords: high-energy X-ray diffraction; near-beta titanium alloys; ageing; Rietveld refinement; spinodal decomposition; metastable phases; Ti-55531 high-energy X-ray diffraction; near-beta titanium alloys; ageing; Rietveld refinement; spinodal decomposition; metastable phases; Ti-55531
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MDPI and ACS Style

Paiotti Marcondes Guimarães, R.; Callegari, B.; Warchomicka, F.; Aristizabal, K.; Soldera, F.; Mücklich, F.; Cavalcanti Pinto, H. In Situ Analysis of the Phase Transformation Kinetics in the β-Water-Quenched Ti-5Al-5Mo-5V-3Cr-1Zr Alloy during Ageing after Fast Heating. Quantum Beam Sci. 2020, 4, 12. https://doi.org/10.3390/qubs4010012

AMA Style

Paiotti Marcondes Guimarães R, Callegari B, Warchomicka F, Aristizabal K, Soldera F, Mücklich F, Cavalcanti Pinto H. In Situ Analysis of the Phase Transformation Kinetics in the β-Water-Quenched Ti-5Al-5Mo-5V-3Cr-1Zr Alloy during Ageing after Fast Heating. Quantum Beam Science. 2020; 4(1):12. https://doi.org/10.3390/qubs4010012

Chicago/Turabian Style

Paiotti Marcondes Guimarães, Rafael; Callegari, Bruna; Warchomicka, Fernando; Aristizabal, Katherine; Soldera, Flavio; Mücklich, Frank; Cavalcanti Pinto, Haroldo. 2020. "In Situ Analysis of the Phase Transformation Kinetics in the β-Water-Quenched Ti-5Al-5Mo-5V-3Cr-1Zr Alloy during Ageing after Fast Heating" Quantum Beam Sci. 4, no. 1: 12. https://doi.org/10.3390/qubs4010012

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