The indentation behaviours of Ni-based single crystal (NBSX) superalloy in different crystal orientations are studied by indentation tests and Electron Backscattered Diffraction (EBSD) analysis. The effects of crystal orientations on pile-up modes, dominant slip system distribution and geometrically necessary dislocation (GND) density distribution are revealed by experiments and crystal plasticity finite element (CPFE) simulation. The results and analysis of pyramid and cone indentations show that the pile-up modes produced by different azimuths are significantly different due to the off-plane displacement distribution. The differences of crystallographic slip behaviors under different crystal orientations induce different slip line and indentation symmetry patterns. EBSD observation and CPFE analysis indicate the dependence of GND density distribution on crystal orientations. The results of indentation tests, EBSD observation and CPFE simulation achieve good agreements.

通过压痕测试和电子背散射衍射（EBSD）分析研究了镍基单晶（NBSX）高温合金在不同晶体取向下的压痕行为。通过实验和晶体塑性有限元（CPFE）模拟，揭示了晶体取向对堆积模式，支配滑移系统分布和几何上必要的位错（GND）密度分布的影响。金字塔和圆锥压痕的结果和分析表明，由于平面外的位移分布，不同方位角产生的堆积模式显着不同。不同晶体取向下的晶体滑移行为的差异引起了不同的滑移线和压痕对称图案。EBSD观察和CPFE分析表明GND密度分布与晶体取向有关。压痕测试，EBSD观察和CPFE模拟的结果取得了良好的一致性。