金属組織
銅合金の導電率に及ぼす冷間圧延加工の影響
キーワード:
Cu–Cr based alloy,
C2600,
Cr system precipitate,
Electrical conductivity,
Transmission Electron Microscope
2020 年 59 巻 1 号 p. 86-90
詳細
2020 年 59 巻 1 号 p. 86-90
Changes in electrical conductivity and mechanical characteristics, after cold rolling up to a maximum cold working ratio of 80％, were investigated for a CuCrTi alloy, Corson copper alloy and C2600. Electrical conductivity of all alloys decreased with increasing cold rolling working ratio. The drop in electrical conductivity was different among the alloys. In the case of C2600, it was about 3％ IACS, while in the case of CuCrTi alloy, the drop was about 8％ IACS. Changes in volume resistivity were investigated while maintaining a temperature of 300℃, and in the results, C2600 exhibited a trend thought to be recovery of processing strain. With CuCrTi alloy, on the other hand, there was no change in volume resistivity. The results of TEM observation of internal structure showed a trend of reduction due to rolling of Cr–based precipitate, suggesting that resolution of Cr–based precipitate is one cause of the drop in electrical conductivity.
