Information on deformation mechanisms in nanocrystalline Pd–10% Au inferred from texture analysis

Information on deformation mechanisms in nanocrystalline Pd–10% Au inferred from texture analysis
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信息%20on%20变形%20机制%20in%20纳米晶%20Pdâ10%%20Au%20推断%20来自%20纹理%20分析

DOI:
10.1007/s10853-010-4552-y
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发表时间:
2010
影响因子:
4.5
通讯作者:
H.-J. Fecht
H.-J. Fecht
中科院分区:
材料科学3区
文献类型:
--
作者:
Yu. Ivanisenko;W. Skrotzki;R. Chulist;T. Lippmann;L. Kurmanaeva;H.-J. Fecht

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目前对纳米晶材料的变形机制还缺乏了解。研究了nc Pd-10% Au合金(晶粒尺寸约15 nm)高压扭转后的显微组织,揭示了各种变形过程的特征,如协同晶界滑动(GBS)、剪切带、位错滑移和孪晶。为了估计这些过程对总应变的贡献,比较了在相同剪切应变下NC和粗晶(CG)样品中形成的扭转织构。用同步辐射测量了织构。cg样品中剪切织构特征分量的强度是nc样品中的两倍,表明nc样品中位错滑移不太明显。认为TEM所揭示的大量GBS协同面对合金的塑性有贡献。
There is still a lack of understanding of deformation mechanisms in nanocrystalline (nc) materials. Studies on microstructures formed in nc Pd–10% Au (grain size about 15 nm) after high pressure torsion revealed signatures of various deformation processes as cooperative grain boundary sliding (GBS), shear banding, dislocation slip and twinning. In order to estimate contributions of these processes to total strain, a comparison was made between torsion textures formed in nc and coarse grained (cg) samples after identical shear strain. The textures were measured with synchrotron radiation. Intensities of characteristic components of the shear texture are two times stronger in the cg sample than in the nc one, indicating that dislocation slip is less significant in the nc sample. It is proposed that numerous planes of cooperative GBS revealed by TEM contribute to plasticity of nc alloy.
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发表时间: 2005
期刊:
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