Cu-4%Ti 合金の二相混合組織の形成における再結晶・粒成長(結晶粒成長)(<特集>再結晶・粒成長)

概要

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Fine dual-phase structure consisting of recrystallized α-Cu grains and Cu_3Ti precipitates at grain boundary corners is obtained in a Cu-4% Ti alloy by the following processing : solution treatment, heavy cold work and annealing. Details of deformation structure, interaction between recrystallization and precipitation and kinetics of grain growth in the dual-phase structure, have been investigated by means of transmission electron and optical microscopy. The results are as follows. (1) The formation of the dual-phase structure occurs at cell structure in cold-rolled specimems. (2) Recrystallization of α-Cu phase and precipitation of Cu_3Ti particles proceed simultaniously in the early stage of annealing at 750℃, and Cu_3Ti particles located at the grain boundary corners grow preferentially during further annealing. On the other hand, high density of titanium rich zones first precipitate during annealing below 650℃. and recrystallization process is retarded by the zones. Heterogenious precipitation of Cu_3Ti particles at the cell walls causes dissolution of the zones and accerelates recrystallization. The lower the annealing temperature, the finer dual-phase structure is formed. (3) Relations between mean radius, R^^- and annealing time, t in grain growth of α-Cu and Cu_3Ti phases, are both described by the following equation, R^^-^4-R^^-^4_0=kt.
社団法人日本鉄鋼協会の論文
1984-11-01