Ti-Al系金属間化合物のキャビテーション壊食特性

概要

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Cavitation erosion of cast and sintered Ti-Al-based intermetallic compounds (Ti-48 Al and Ti 50 Al) was studied using a vibratory apparatus. The erosion resistance of intermetallic compounds is 20 to 70 times higher than that of pure titanium. Cavitation produces wavy undulations on the surface of intermetallic compounds. Microcracks are formed at the tip of the wavy undulations, where material removal occurs. The erosion resistance of sintered intermetallic compounds is slightly higher than that of cast compounds because of their smaller grain size. Ti-Al-based intermetallic compounds contain γ single phase and lamellar phase (γ phase and α_2 phase). The γ single phase is more work-hardened than the lamellar phase due to the accumulation of twinning deformations produced by the repeated action of cavitation bubble collapse pressures. Therefore, the erosion resistance increases with an increase in volume of the γ single phase, that is, the resistance of Ti-50 Al is higher than that of Ti-48 Al. It was concluded that the erosion resistance of intermetallic compounds can be evaluated in terms of HV^2/E, where E is Young's modulus and HV is Vickers hardness after work-hardening due to cavitation.
一般社団法人日本機械学会の論文
1996-09-25