γ基TiAl金属間化合物の強度および破壊じん性の温度依存性

概要

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Bending strength and fracture toughness tests were carried out on four kinds of gamma base Titanium Aluminides with different microstructures in the temperature range from room temperature to 1000℃. Both bending strength and fracture toughness at room temperature were highest for the one with lamellar structure and lowest for the one with equiaxed structure. Fracture toughness increased with an increase in temperature up to a critical temperature and then decreased. Chromium addition, which stabilizes ductile β phase, significantly improved high temperature fracture toughness. The critical temperature at the maximum fracture toughness, which corresponds to recrystallization temperature, was around 800℃ for binary and chromium added TiAl, while that for niobium added one was about 1000℃.
社団法人日本材料学会の論文
1994-02-15