β Ti-Fe 合金の等温時効挙動

概要

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The isothermal aging behavior of Ti-5, 8 and 10mass%Fe alloys at 673K, 723K and 773K was investigated by resistivity and hardness measurements, X-ray diffractometry and transmission electron microscopy. The Time-Temperature-Transformation diagram of the alloys was determined. In Ti-5 mass%Fe and Ti-8 mass%Fe, the isothermal ω phase precipitated by aging at all of the aging temperatures. Because the isothermal ω phase did not precipitate by 773K aging in T-10mass%Fe, the upper temperature limit for precipitation of isothermal ω phase in Ti-10mass%Fe will situate between 723K and 773K. Incubation period prior to nucleation of α phase is shortened with elevating aging temperature. The influence of Fe content on the time for nucleation of α phase was not clear. Only at 723K, resistivity and hardness of all specimens show second abrupt decrease by more than 600ks aging, which suggests the precipitation of TiFe.
社団法人日本鉄鋼協会の論文
1998-11-01