Precipitation during recrystallization in Al-Cr alloys
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Recrystallization and precipitation in an Al-0.5%Cr and an Al-0.5%Cr-0.05%Si alloy, solution treated at 640°C and cold rolled, then aged at various temperatures, were studied by measuring electrical resistivity and hardness and by conducting transmission electron microscopic observation. The results obtained are as follows:1) Precipitation was acceleratec by cold work. This acceleration was marked in low temperature aging (>400°C), where recrystallization proceeded gradually.2) Nucleation of the precipitates occurred preferentially at lattice defects, such as dislocations or subboundaries.3) The acceleration of the precipitaion was attributed to easy nucleation at lattice defects. In low temperature aging, the precipitation rate was further incresed by the enhancement of solute diffusion during the gradual progress of recrystallization.4) The precipitates were globular in form in low temperature aging and plates or needles in high temperature aging. The retardation of recrystallization by precipitation was observed.5) The addition of a small amount of Si also enhanced the precipitation and retarded the recrystallization. The retardation of recrystallization was related to the enhancement of the precipitation.6) Precipitate phases at all temepratures were the equilibrium Al7Cr phase.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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