Synthesis In Situ Composite TiAl-Based with Particulate Al₂O₃ Reinforcement by Powder Metallurgy Route

Abstract:

A major effort has been made over last 20 or so years to introduce TiAl-based alloys into the market-place as engineering component. Recently, titanium aluminide based composites are competitive candidate for aerospace use due to the favorable properties of matrix material, such as low density, high specific strength and relative good properties at elevate temperature [1-4]. The amount of aluminum in titanium alloys exceeds that used in conventional alloys and can range from 10 to 48at%. This concentration of aluminum allows the formation of an in-situ alumina reinforcement which is responsible for the excellent oxidation, sulfidation and carburization resistance at temperatures of 1000°C and higher. However, their brittleness and rapid crack growth rate at low to intermediate temperature hinders their application/3/. Nevertheless, nanostructure of monolithic TiAl is unstable at elevate temperatures which deteriorate the high temperature properties. In order to improve the high temperature strength of intermetallic, ceramic particles can be utilized as reinforcements [4, 5]. Recently, in-situ techniques have been utilized to fabricate TiAl-Al₂O₃ composite through displacement reaction between TiO₂ and Al in planetary ball milling and subsequence heat treatment. The knowledge of reaction characteristic in the Al-TiO₂ system is great importance to optimize the processing/4, 6/. The chemical compatibility with the iron aluminide matrix at temperature above 1000°C is an important factor for the selection of reinforcements because extreme interfacial reaction during processing results in the degradation of mechanical properties [3, 4].

• Periodical: Advanced Materials Research (Volume 858)
• Pages: 159-163
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.858.159
• Online since: November 2013
• Authors: Tran Duc Huy, Nguyen Hong Hai, Keiichi N. Ishihihara
• Keywords: Al₂O₃, In Situ Composite, TiAl-Based

References

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DOI: 10.1016/j.jallcom.2008.12.047

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DOI: 10.1016/s0921-5093(98)00770-9

[5] Carl Koch; Nanostructure Science and Technology, Kluwer Academic Publishers (1999).

[6] Tran Duc Huy, Nurulakmal Mohd Sharif, Zuhailawati Hussain, Keiichi N. Ishihara, characterization of FeAl by powder Metallurygy Route, the 17th Electron microscopy Society Malaysia Scientific Conference (EMSM) and 18th Annual General Meeting EMSM, 18-20th December 2008, Kuala Lumpur, Malaysia.