Effect of crystal orientation on the indentation behaviour of Ni-based single crystal superalloy
Effect of crystal orientation on the indentation behaviour of Ni-based single crystal superalloy
复制标题
晶体取向对镍基单晶高温合金压痕行为的影响
DOI：
10.1016/j.msea.2019.138893
复制
发表时间：
2020-01-31
期刊：
影响因子：
6.4
通讯作者：
Shi, Huiji
中科院分区：
文献类型：
--
作者：
Han, Qi-Nan;Rui, Shao-Shi;Shi, Huiji
通过压痕试验和电子背散射衍射（EBSD）分析，研究了镍基单晶高温合金在不同晶向下的压痕行为。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、主导滑移系统分布和几何必要位错（GND）密度分布的影响。对锥体和金字塔压痕的分析结果表明，由于离面位移分布的影响，不同方位角产生的堆积模式有显著差异。不同晶体取向下晶体滑移行为的差异导致了不同的滑移线和压痕对称模式。EBSD观测和CPFE分析表明，GND密度分布与晶体取向有关。压痕试验、EBSD观测和CPFE模拟结果吻合较好。
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.