| 摘要 |
This hot-rolled copper plate is made from pure copper having a purity of 99.99 mass% or greater, the average crystal grain diameter being 40 μm or less, and the (&Sgr;3+&Sgr;9) grain boundary length ratio (L(&sgr;3 + &sgr;9)/L), which is the ratio between the total crystal grain boundary length (L) measured by the EBSD method and the sum (L(&sgr;3 + &sgr;9)) of the &Sgr;3 grain boundary length (L&sgr;3) and the &Sgr;9 grain boundary length (L&sgr;9) is 28% or greater. |
