金属組織
Cu–Zn系合金におけるヘテロナノ組織と機械的特性に及ぼす圧延方法の影響
キーワード:
Cu–Zn alloy,
heterogeneous–nano structure,
heavy cold rolling,
cross rolling,
mechanical property
2022 年 61 巻 1 号 p. 56-61
詳細
2022 年 61 巻 1 号 p. 56-61
The heterogeneous–nano (HN) structure consisting of “eye”–shaped twin domains, shear bands and lamellar grains is developed by heavy cold rolling of FCC metals and alloys with low stacking fault energy, and it provides superior strength/ductility balance. In this study, a Cu–Zn system alloy was subjected to two different rolling methods, and the effects of rolling methods on the development of the HN structure and mechanical properties were investigated. Some specimens were subjected to conventional unidirectional rolling up to a 90％ reduction in thickness. The others were cross–rolled to 90％, in which the rolling direction was rotated by 90° for each rolling pass. The 90％ cold rolling by both methods successfully introduced the typical HN structure. The cross–rolled specimen exhibited more isotropic mechanical properties than those of the unidirectionally rolled one. The more isotropic mechanical properties of the cross–rolled specimens were attributed to the more isotropic microstructure developed.
