当前位置: X-MOL 学术J. Mech. Phys. Solids › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Quantifying hydrogen concentration in the vicinity of zirconium hydrides and deformation twins
Journal of the Mechanics and Physics of Solids ( IF 5.3 ) Pub Date : 2020-12-24 , DOI: 10.1016/j.jmps.2020.104287
Alireza Tondro , Hamidreza Abdolvand

This study focuses on investigating the effects of the localized stresses that develop during formation of zirconium hydrides on the redistribution of hydrogen atoms in the zirconium matrix. A coupled mass diffusion and crystal plasticity finite element approach is used. The effects of the transformation strain associated with the formation of hydrides within various combinations of soft-hard grains and tri-crystals are studied. In addition, the interaction between intergranular and intragranular hydrides with grain boundaries is investigated. It is shown that hydrogen atoms tend to diffuse towards the tips of hydrides and away from their sides due to the tensile and compressive hydrostatic stresses that respectively develop at these two locations. This results in the propagation of a hydride along its axial direction. It is further shown that under a tensile applied stress, hydrides tend to form and propagate within hard grains, where stress hotspots with high tensile hydrostatic stresses develop. Lastly, it is shown that hydrogen atoms tend to diffuse towards twin tips, particularly when the twin tip is located near a harder grain.



中文翻译:

量化氢化锆和变形孪晶附近的氢浓度

这项研究的重点是调查在氢化锆形成过程中产生的局部应力对氢原子在锆基体中的重新分布的影响。使用耦合的质量扩散和晶体可塑性有限元方法。研究了在软硬晶粒和三晶的各种组合中与氢化物形成相关的相变应变的影响。另外,研究了晶间和晶内氢化物与晶界之间的相互作用。结果表明,由于在这两个位置分别产生的拉伸和压缩静液压应力,氢原子倾向于向氢化物尖端扩散,并远离其侧面扩散。这导致氢化物沿其轴向传播。进一步表明,在施加拉应力的情况下,氢化物趋于在硬晶粒内形成并传播,在硬晶粒内会出现具有高拉伸静水应力的应力热点。最后,表明氢原子倾向于向双尖端扩散,特别是当双尖端位于较硬的晶粒附近时。

更新日期:2021-01-06
down
wechat
bug