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Microstructure and mechanical properties of γ-TiAl consolidated by spark plasma sintering

S. Kennedy, S. Kumaran, T. Srinivasa Rao

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Abstract

This paper reports microstructure and mechanical properties of spark plasma sintered γ–TiAl alloys. Prealloyed powders of γ–TiAl added with varying proportions of niobium were mechanically milled in a high energy ball mill with optimized parameters for 20 hours and were consolidated by spark plasma sintering with the temperature of 1100°C for 5 min. Microstructure was analyzed by Scanning and Transmission Electron Microscopes. X-ray Diffraction was used to study the resultant phases. The hardness increases from 980 Hv to 1075 Hv with increasing Nb content and the elastic modulus varies between 222 G Pa to 236 G Pa.

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What this paper is about

This paper reports microstructure and mechanical properties of spark plasma sintered γ–TiAl alloys. Prealloyed powders of γ–TiAl added with varying proportions of niobium were mechanically milled in a high energy ball mill with optimized parameters for 20 hours and were consolidated by spark plasma sintering with the temperature of 1100°C for 5 min. Microstructure was analyzed by Scanning and Transmission Electron Microscopes. X-ray Diffraction was used to study the resultant phases. The hardness increases from 980 Hv to 1075 Hv with increasing Nb content and the elastic modulus varies between 222 G Pa to 236 G Pa.

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Available abstract

This paper reports microstructure and mechanical properties of spark plasma sintered γ–TiAl alloys. Prealloyed powders of γ–TiAl added with varying proportions of niobium were mechanically milled in a high energy ball mill with optimized parameters for 20 hours and were consolidated by spark plasma sintering with the temperature of 1100°C for 5 min. Microstructure was analyzed by Scanning and Transmission Electron Microscopes. X-ray Diffraction was used to study the resultant phases. The hardness increases from 980 Hv to 1075 Hv with increasing Nb content and the elastic modulus varies between 222 G Pa to 236 G Pa.

Key concepts: Materials science, Microstructure, Spark plasma sintering, Ball mill, Niobium, Transmission electron microscopy, Scanning electron microscope, Metallurgy

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