Pb-Sn共晶合金の圧縮変形における組織変化と超塑性

概要

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Deformation behavior and the microstructral evolution with strain were studied in the Pb-Sn eutectic alloys which were solidified at different cooling rates. The flow behavior of the as-cast specimens was explores in copression tests. Stress-strain curves showed a maximum stress at several percent strain, after which the flow stress decreased to a steady state. The flow stress level of the rapidly solidified specimens with finer mcrostructures was always lower than that of the slowly solidified specimens. The microstrucures of specimens changed during deformation, which was introduced mainly by dynamic recrystallization. Equi-axed recrystallized grains formed during deformation increased with strain. As a result, the deformation became superplastic and the strain-rate sensitivity index m increased from 0.2 to 0.4. The as-cast materials, which showed low ductility in tensile tests, can show superplastic behavior in compression tests due to the microstructural evolution during deformation.
社団法人日本材料学会の論文
1989-09-15