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首页> 外文会议>Eighth International Fatigue Congress Vol.3, Jun 3-7, 2002, Stockholm, Sweden >CYCLIC PLASTICITY OF POLYCRYSTALLINE NICKEL FROM MICROSCALE TO SUBMICROSCALE
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CYCLIC PLASTICITY OF POLYCRYSTALLINE NICKEL FROM MICROSCALE TO SUBMICROSCALE

机译：从微米级到亚微米级的多晶镍的循环塑性

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摘要

The influence of the grain size D and of the initial defect structure (IDS) on the cyclic plasticity of microcrystalline and submicrocrystalline nickel was investigated. Samples of four material classes, produced by severe plastic deformation combined with special annealing procedures as well as by pulsed electrodeposition, were cyclically deformed at room temperature. Using different methods of electron microscopy a detailed characterisation of the grain structure and of the defect structure was performed in the initial stage and after fatigue. The cyclic stress-strain response (CSSR) of the different material types is discussed and compared with that of "conventional"-grained nickel, where the CSSR is only weakly dependent on the grain size: (ⅰ) The resistance against microstructure changes is shown to depend strongly on the IDS and the processing procedure, (ⅱ) For dislocation clustering in patterns a lower threshold of D seems to exist, (ⅲ) Finally, at grain sizes below some micrometers the CSSR becomes significantly dependent on D.
机译：研究了晶粒度D和初始缺陷结构（IDS）对微晶镍和亚微晶镍循环塑性的影响。通过严重的塑性变形结合特殊的退火程序以及通过脉冲电沉积产生的四种材料类别的样品在室温下周期性变形。在疲劳的初始阶段和疲劳之后，使用不同的电子显微镜方法对晶粒结构和缺陷结构进行了详细的表征。对不同材料类型的循环应力-应变响应（CSSR）进行了讨论，并将其与“常规”晶粒镍的循环应力-应变响应进行比较，后者仅弱依赖于晶粒尺寸：（ⅰ）显示了对微观结构变化的抵抗力在很大程度上取决于IDS和加工程序，（For）对于图案中的位错聚类，似乎存在较低的D阈值，（ⅲ）最后，在小于几微米的晶粒尺寸下，CSSR显着取决于D。

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