準安定Ti-Mo合金の延性と応力誘起生成物に関する研究

概要

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The relationships between the mechanical properties and the thermal instability, and the influence of the rolling on Ti-5,14 and 20wt% Mo alloys quenched are studied by hardness testing. The deformation behaviours on these alloys are done in tensile testing at the temperature-range from 77K to 300K. The results obtained are as follows ; (1) It is appeared from the dependence of hardness changes upon the isochronal ageing temperature that in Ti-14wt% Mo alloy the thermal instability is the largest and the ω phase is formed. (2) By the rolling, the formation of ω phase in Ti-14wt% Mo alloy is appearently promoted, and this phenomenon is recognized up to 10% reduction but not for 30% reduction. (3) In tensile testing, it is appeared that Ti-14wt% Mo alloy is homogeneously deformed in twinning, and Ti-20wt% Mo alloy is locally done in slipping. (4) Ti-14wt% Mo alloy has the excellent mechanical properties having remarkable elongation and linear work hardening rate, however Ti-20wt% Mo alloy has small elongation.
岡山理科大学の論文