Grain boundary statistics in nano-structured iron produced by high pressure torsion
Grain boundary statistics in nano-structured iron produced by high pressure torsion
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DOI：
10.1016/j.msea.2004.08.071
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发表时间：
2005-01-15
期刊：
影响因子：
6.4
通讯作者：
Fecht, HJ
中科院分区：
文献类型：
--
作者：
Ivanisenko, Y;Valiev, RZ;Fecht, HJ
利用透射电子显微镜（TEM）和取向成像显微镜（OIM）研究了Armco铁在高压扭转（HPT）变形后的显微组织和晶界取向偏差谱。结果表明，在y=210和420的剪切应变下，HPT变形可形成平均晶粒尺寸为270和130nm的等轴晶粒结构。HPT铁的错取向光谱具有双峰特征，在低（1-2度）和高错取向角范围内最大。HPT显示特殊边界（Sigma3-Sigma45）的分数显著增加。讨论了高温变形引起的组织变化，并与常规变形模式下的组织变化进行了比较。(C) 2004 Elsevier B.V.版权所有
The microstructure and the spectrum of grain boundary misorientations were studied in Armco iron, following high pressure torsion (HPT) deformation, by means of transmission electron microscopy (TEM) and orientation imaging microscopy (OIM). It was found that HPT deformation results in the formation of an equiaxed grain structure with a mean grain size of 270 and 130nm using a shear strain of y=210 and 420, respectively. The misorientation spectra in HPT iron have a bimodal character with maxima in low (at 1-2degrees) as well as in high misorientation angle ranges. A marked increase in the fraction of special boundaries (Sigma3-Sigma45) was revealed as a result of HPT. The microstructural changes due to HPT are discussed and compared with those obtained during conventional deformation modes. (C) 2004 Elsevier B.V. All rights reserved.