Strain field evolution during dynamic recrystallization nucleation; A case study on ice
Strain field evolution during dynamic recrystallization nucleation; A case study on ice
复制标题
动态再结晶成核过程中的应变场演化；
DOI：
10.1016/j.actamat.2015.08.033
复制
发表时间：
2015
期刊：
影响因子：
9.4
通讯作者：
P. Vacher
中科院分区：
文献类型：
--
作者：
T. Chauve;M. Montagnat;P. Vacher
利用数字图像相关技术研究了多晶柱状冰蠕变过程中不连续动态再结晶（DDRX）的形核机制。由于柱状微观结构，可以通过比较变形前和变形后的纹理来准确地识别核。在发生核化的三重结周围进行原位DIC分析，以跟踪应变场的演变。应变场的演化与形核机制、局部晶界迁移和亚晶界形成（如倾斜亚晶界和扭结带）密切相关。成核过程与强应变不均匀性相关，由DIC评估的主要应变很好地表征。通过应变局部化沿着新晶界的演化，可以跟踪晶核的生长。扭结带作为靠近三重连接的缓冲区，并容纳平行于轴的剪切。局部应变场似乎是有效地重新分布的再结晶过程中，创建一个新的微观结构更兼容的局部应力。
Nucleation mechanisms occurring during discontinuous dynamic recrystallization (DDRX) is investigated by Digital Image Correlation (DIC) during creep experiment on polycrystalline columnar ice. Thanks to the columnar microstructure, discrimination of the nucleus can be done without ambiguity comparingpre-andpost-deformation texture.In-situDIC analyses are performed around a triple junction were nucleation occurred to follow strain field evolution. Strain field evolution appears strongly linked to nucleation mechanisms, local grain boundary migration and sub-grain boundary formation such as tilt sub-grain boundaries and kink bands. Nucleation processes are correlated with strong strain heterogeneities well characterized by the principal strains evaluated by DIC. It was possible to follow nucleus growth through the evolution of strain localization along the new grain boundaries. Kink bands act as a buffer zone close to the triple junction and accommodate shear parallel to thec-axis. The local strain field appears to be efficiently redistributed by recrystallization processes which create a new microstructure more compatible with the local stresses.
EDML（南极洲）深冰芯中的亚晶界和相关微观结构特征
影响因子：
3.4
作者：
Weikusat;Kipfstuhl;Miyamoto
通讯作者：
Miyamoto