603 コルソン系銅合金における曲げ割れ発生と組織の関係(材料と組織,オーガナイズドセッション)

概要

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In recent years, higher mechanical properties are being demanded in thin sheets of copper alloys with the miniaturization of electric and electronic parts. Above all, because the materials for connector are usually subjected to heavy bending, good bending properties are especially required together with strength, electrical conductivity, etc. In this study, crack initiation in bending deformation in a Corson series copper alloy related to its texture was investigated. The alloy was melted, cast, hot-rolled to 12mm thickness, scalped to 10mm thickness, cut into plates of 30×30mm, Sheet specimens of 0.3mm thickness were prepared from the plates through three different processes: (i) cold-rolled to 2.5mm, solution-treated at 800℃ for 1h, water-cooled, cold-rolled to 1.6mm, aged at 480℃ for 1h and finally old-rolled to 0.3mm; (ii) cold-rolled to 0.3mm, solution-treated at 800℃ for 1h, water-cooled, and finally aged at 480°C for 3h; (iii) cold-rolled to 0.6mm, solution-treated at 800°C for lh, water-cooled, cold-rolled to 0.3mm, and finally aged at 480℃ for 3h. Test pieces of 20×10mm ware cut from the sheets in the longitudinal (GW.: Good Way) and transverse (B.D.: Bad Way) directions. Then, crystal orientation was characterized by EBSD, microscopically, and bend deformation was conducted.
社団法人日本機械学会の論文
2008-09-12