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Influence of the oxidation behavior of Ti–6Al–4V alloy in dry air on the oxide layer microstructure

Lamiaa Z. Mohamed, S. S. Abd Elmomen, and Shimaa El-Hadad

Mining, Petroleum, and Metallurgical Engineering Department, Faculty of Engineering, Cairo University, Giza, Egypt

 

E-mail: lamiaa.zaky@cu.edu.eg

Received: 3 August 2021  Accepted: 5 November 2021

Abstract:

The effects of isothermal oxidation parameters on the oxidation kinetics and morphology of the oxides layers obtained on Ti–6Al–4V alloy (Ti64) at 650, 750 and 850 °C for 50 h in dry air were studied. Morphology of the oxide scales was examined by scanning electron microscopy (SEM) and the energy-dispersive X-ray analysis (EDX). The phases in the scales were characterized by X-ray diffraction. The rate of oxidation at the different temperatures was described by a parabolic equation, and the oxidation activation energy value was 191.7 kJ/mol. The parabolic rate constants were 8.80 × 10–9, 7.48 × 10–8 and 7.68 × 10–7 g2/(cm4.h) at 650 °C, 750 °C and 850 °C, respectively. The morphologies through the cross section of the oxide layers were analyzed by SEM, spot and line EDX. The analysis of the oxide scale revealed mainly TiO2 and small amount of Al2O3. The oxide layers were discontinuous and non-protective layers at 750 °C and 850 °C.

Keywords: High-temperature oxidation; Ti–6Al–4 V alloy; Microstructure; Activation energy

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-021-01976-2

 

Chemical Papers 76 (3) 1627–1638 (2022)

Wednesday, May 29, 2024

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