焼入れ Ti-5Fe 合金の比抵抗, 組織に及ぼす Al 添加の影響

概要

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Previous results on β quenched Ti-2∿15%(mass%) Fe alloys suggested that the volume fraction of athermal ω phase (ω_<ath>) was maximum in the Ti-5%Fe alloy. In present work, influence of Al addition to the Ti-5%Fe alloy on the formation of ω_<ath> has been investigated by resistivity and hardness measurement, X-ray and electron diffractometry in the β quenched state. In alloys containing up to 8%Al, optical microscopy reveals single phase structure, and only β phase is detected by X-ray diffraction. Resistivity monotonously increases with Al content. Resistivity ratio between liquid nitrogen and room temperature, ρ_<LN>/ρ_<RT>, shows a maximum at 6%Al, at which hardness shows a minimum. Room temperature electron diffraction pattern due to athermal ω phase is changed by the Al addition from clear spots to diffuse scattering. Similarly as the case of Ti-20V-Al, it is considered that the added Al dissolves substitutionally into β Ti-5%Fe lattice, lowers starting and finishing temperatures of athermal ω phase formation, ω_s and ω_f, and then decreases volume fraction of athermal ω phase at room temperature.
社団法人日本鉄鋼協会の論文
1994-11-01