Abstract
Ti–Al matrix alloy reinforced with a high content of boron was fabricated by using a high-temperature alloying method and powder metallurgy technique (P/M). The preparation method of Ti–Al–B alloying powder was put forward. Phases, microstructure, and mechanical properties of the alloys were investigated. Wear and friction performance were studied by using a ball-on-disc tribotester sliding against a Si3N4 ceramic ball from 23 °C (room temperature) to 900 °C. The Ti–Al–B alloy had a higher specific strength than that of the Ti–Al alloy. The boron element obviously enhanced the wear resistance and mechanical properties of the alloys because of the formation of borides (TiB2 and AlB2) in matrices and the stable oxide film on the wear tracks. Friction coefficients of alloys were independent of the boron element. The wear mechanisms of the alloys transferred from fatigue wear to oxidative wear with the increase in temperature.
Highlights
Titanium alloys are characterized by low density, high strength, and oxidation resistance; they have been widely used as high-temperature mechanical components such as nozzles, divergent flaps and blades in aviation industries, and braking systems [1,2,3,4,5,6]
The mechanical parts could suffer from severe wear at high temperatures
The solid lubricants can decrease the friction and wear of titanium matrix composites at elevated temperatures, the solid lubricants destroy the mechanical properties of materials [18,19,21,23]
Summary
Titanium alloys are characterized by low density, high strength, and oxidation resistance; they have been widely used as high-temperature mechanical components such as nozzles, divergent flaps and blades in aviation industries, and braking systems [1,2,3,4,5,6]. It is necessary to study the wear and friction properties of titanium matrix alloys at high temperatures. Investigations of tribological properties of Ti matrix materials have been done, alloys showed low wear resistance [7,8]. This will limit the application of Ti alloys. The solid lubricants can decrease the friction and wear of titanium matrix composites at elevated temperatures, the solid lubricants destroy the mechanical properties of materials [18,19,21,23]. We make an attempt to balance the mechanical properties and friction coefficient as well as wear of titanium alloys at elevated temperatures.
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