摘要
采用大变形异步叠轧的方法制备超细晶铜材,从宏观上研究异步叠轧组织变化过程。分析研究表明轧制过程原始等轴晶粒在板面方向上被压扁并延展,当变形量大到一定程度,部分压扁的晶粒碎化;原始等轴晶纵向在轧制过程中晶粒由等轴晶逐渐被拉长成纤维组织,随着应变量的增加,纤维组织逐渐变细长,部分纤维组织在进一步叠轧过程中断掉;横向上晶粒也是逐渐压扁拉长,同时晶粒内部以及晶界多处发生滑移(或兼有孪生)。异步叠轧过程中宏观的组织变化过程类似与同步叠轧过程。均匀的轧制组织再结晶退火后可以获得均匀超细晶,通过再结晶处理,可以获得晶粒尺寸在2μm以下的超细晶铜材。
The microstructure evolution during fabricating UFG-Copper （Ultra Fine Grain） with SD-AARB （Severe DeformatiorrAsymmetrical Accumulative Roll-Bonding） method is studied on macro scale. The analysis shows that grains are staved and extend along sheet plane in ARB process, and some staved grains break when strain reaches some value; grains in the longitudinal direction that is parallel with the rolling axis are elongated to fiber mierostrueture, the fiber becomes thinner with strain, and some fiber structure rupture; grains in transverse direction also are staved and elongated, and slipping or twins occur within the grain or on the grain boundaries. Microstructure evolution in AARB process is similar to that in ARB process on macro scale. Homogeneous UFCvCopper is obtained when the uniform rolling structure is recrystallized and UFCrCopper with the grain size below 2μm ean be obtained after further recrystallized.
出处
《新技术新工艺》
2006年第4期96-99,共4页
New Technology & New Process
