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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Activation of dislocation sources in γ-phases of nickel-base superalloys studied by use of atomic-force microscopy and transmission electron microscopy
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Activation of dislocation sources in γ-phases of nickel-base superalloys studied by use of atomic-force microscopy and transmission electron microscopy

机译：原子力显微镜和透射电子显微镜研究镍基高温合金γ相中位错源的活化

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摘要

Using in situ atomic force microscopy (AFM) and post-mortem transmission electron microscopy (TEM), the activation of dislocation sources in γ-phases of nickel-base superalloys has been investigated. Sources, at the origin of slip bands containing numerous pile-ups of several tens of dislocations, are heterogeneously distributed. They are a few micrometers apart. The physical reason for such an heterogeneity is the presence of short-range order which induces a high friction stress acting against the dislocation movement. A description of the solid solution as a combination of soft and hard areas is proposed. Dislocation sources can be activated in areas where the friction is low while the presence of hard zones hinders their operation. This distribution of hard and soft zones results from the local variations of short-range order. The distribution of the sources indicates that soft regions are a few micrometers apart.
机译：使用原位原子力显微镜（AFM）和事后透射电子显微镜（TEM），研究了镍基高温合金γ相中位错源的活化。在包含数十个位错的大量堆积的滑移带的起源处，源是不均匀分布的。它们相距几微米。这种异质性的物理原因是短程有序的存在，该短程有序产生了引起位错运动的高摩擦应力。建议将固溶体描述为软区域和硬区域的组合。位错源可在摩擦力低的区域激活，而硬区的存在会阻碍其运行。硬区和软区的这种分布是由短程顺序的局部变化引起的。源的分布表明，软区域相距几微米。

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