Texture Evolution and Dislocation Behavior in a Nickel-Based Superalloy during Hot Compression
Texture Evolution and Dislocation Behavior in a Nickel-Based Superalloy during Hot Compression
复制标题
镍基高温合金热压缩过程中的织构演变和位错行为
DOI：
10.1002/adem.201900892
复制
发表时间：
2019
影响因子：
3.6
通讯作者：
Ding Yutian
中科院分区：
文献类型：
--
作者：
Gao Zexi;Jia Zhi;Ji Jinjin;Liu Dexue;Guo Tingbiao;Ding Yutian
利用电子背散射衍射（EBSD）技术和透射电子显微镜（TEM）研究了不同温度和应变速率（1 s− 1）下镍基高温合金的织构演化和位错行为。结果表明，在高温变形条件下，没有明显的织构形成，特别是发生了完全动态再结晶。此外，通过在Ni基高温合金上进行DRX过程，容易实现织构弱化，而在晶粒生长期间观察到轻微的强化。根据TEM图像，低温下具有高取向梯度的原始晶界为动态再结晶核提供了良好的位置，这与位错运动密切相关。此外，它的结论是，位错行为在镍基高温合金的塑性变形中起着重要的作用。为镍基高温合金的应用和进一步提高其塑性变形性能提供了理论指导。
Texture evolution and dislocation behavior of Ni‐based superalloys at various temperatures and strain rate of 1 s−1are studied using electron backscatter diffraction (EBSD) technique and transmission electron microscope (TEM). It can be concluded that no significant texture is formed at high deformation temperature, especially for the occurrence of completed dynamic recrystallization (DRX). In addition, texture weakening is easy to realize by conducting DRX process on the Ni‐based superalloys, whereas a slight strengthening is observed during grain growth. Based on the TEM images, the original grain boundary with high orientation gradient at low temperature provides an excellent position for DRX nuclei, which is strongly related with the dislocation motion. Moreover, it is concluded that the dislocation behavior plays a significant role in the plastic deformation of the Ni‐based superalloys. Herein, theoretical guidance for the application of nickel‐based superalloys and furthermore enhancement of their plastic deformation properties is provided.