Microstructure homogeneity in various metallic materials heavily deformed by accumulative roll-bonding
Microstructure homogeneity in various metallic materials heavily deformed by accumulative roll-bonding
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DOI：
10.1016/j.msea.2006.02.028
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发表时间：
2006-05-15
期刊：
影响因子：
6.4
通讯作者：
Kamikawa, N.
中科院分区：
文献类型：
--
作者：
Li, B. L.;Tsuji, N.;Kamikawa, N.
各种金属材料(铝、铜、36%Ni钢和IF钢)通过累积滚压成形(ARB)获得了4.8的当量应变。用电子背散射图谱(EBSP)分析了组织随厚度变化的均匀性。在所有研究材料中，ARB处理后的板材均填充有细长的超细晶组织。虽然在早期的ARB循环中，轧制过程中由于大摩擦而产生的多余剪切应变导致了组织的不均匀，但重复ARB循环使组织变得非常均匀。除纯铜的高角度晶界比例在50%左右外，其余高角度晶界的比例均在70%以上。在ARB过程中，由于材料的高纯度和绝热加热，铜中大量的低角度晶界被归因于部分再结晶。显微维氏硬度值在板材厚度方向上是均匀的，与组织的均匀性相对应。(C)2006爱思唯尔B.V.保留所有权利。
Various kinds of metallic materials (Al, Cu, 36% Ni steel and IF steel) were severely deformed to an equivalent strain of 4.8 by the accumulative roll-bonding (ARB) process. The microstructure homogeneity through the sheet thickness was studied by the electron back scattering pattern (EBSP) analysis. The ARB processed sheets were homogeneously filled with the elongated ultrafine grained structure in all the studied materials. Though redundant shear strain due to large friction during rolling caused inhomogeneous microstructure through thickness in early ARB cycle, repetition of the ARB cycle made the microstructure quite uniform. The fraction of high angle grain boundaries was above 70% except for pure copper, where the high angle boundary fraction was around 50%. The large fraction of low angle boundaries in copper was attributed to partial recrystallization during the ARB process due to high purity of the material and adiabatic heating. The micro Vickers hardness values were homogeneous through the sheet thickness, corresponding to the microstructure homogeneity. (c) 2006 Elsevier B.V. All rights reserved.