Zaki, A., El-Hadad, S., Khalifa, W. (2025). Thermal Oxidation Effects on Sub-Surface Microstructure and Mechanical Properties of Cast and Forged α/β Titanium Alloys . International Journal of Materials Technology and Innovation, 5(1), 50-58. doi: 10.21608/ijmti.2025.436308
Ahmed Zaki; Shimaa El-Hadad; Waleed Khalifa. "Thermal Oxidation Effects on Sub-Surface Microstructure and Mechanical Properties of Cast and Forged α/β Titanium Alloys ". International Journal of Materials Technology and Innovation, 5, 1, 2025, 50-58. doi: 10.21608/ijmti.2025.436308
Zaki, A., El-Hadad, S., Khalifa, W. (2025). 'Thermal Oxidation Effects on Sub-Surface Microstructure and Mechanical Properties of Cast and Forged α/β Titanium Alloys ', International Journal of Materials Technology and Innovation, 5(1), pp. 50-58. doi: 10.21608/ijmti.2025.436308
Zaki, A., El-Hadad, S., Khalifa, W. Thermal Oxidation Effects on Sub-Surface Microstructure and Mechanical Properties of Cast and Forged α/β Titanium Alloys . International Journal of Materials Technology and Innovation, 2025; 5(1): 50-58. doi: 10.21608/ijmti.2025.436308
Thermal Oxidation Effects on Sub-Surface Microstructure and Mechanical Properties of Cast and Forged α/β Titanium Alloys
1Faculty of Engineering, Dept. of Mining, Petroleum and Metallurgical Engineering
2Central Metallurgical R&D Institute
3Faculty of Engineering, Cairo University
Abstract
Ti-6Al-7Nb (Ti67) alloy has recently been developed to replace the commercial Ti6Al4V (Ti64) biometallic alloy because of the reported toxicity of the elemental vanadium. Thermal oxidation is an important processing method applied to improve the hardness and wear properties of such titanium alloys. Since the developed alloy, Ti67, contains Nb as beta phase stabilizing element instead of V in case of Ti64, it is expected to behave differently upon processing by thermal oxidation. In addition, this behavior may be influenced by the processing method. Therefore, it is of interest to investigate the influence of thermal oxidation on the surface properties of Ti67 alloy in its forged and cast conditions and compare the results to the commonly used Ti64 alloy. It was observed that the thickness of alpha case formed in Ti64 after oxidation at (1173 K-1373 K) (900-1100 oC) was greater than in Ti67. In addition, the equiaxed microstructure of the forged samples showed a thicker alpha case than the widmanstätten microstructure of the cast samples for the two alloys. Both forged and cast Ti64 showed significant improvement in dry sliding wear resistance after thermal oxidation at (1173 K-1373 K) (900 °C and 1100 °C), while alloy Ti67 showed less improvement despite the improved surface hardness.
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