Chemomechanical effects on the separation of interfaces occurring during fracture with emphasis on the hydrogen-iron and hydrogen-nickel system
Chemomechanical effects on the separation of interfaces occurring during fracture with emphasis on the hydrogen-iron and hydrogen-nickel system
复制标题
DOI：
10.1016/j.actamat.2015.07.057
复制
发表时间：
2015-10-15
期刊：
影响因子：
9.4
通讯作者：
Sofronis, Petros
中科院分区：
文献类型：
--
作者：
Kirchheim, Reiner;Somerday, Brian;Sofronis, Petros
在断裂过程中，新的表面由扩展的裂纹形成。根据材料成分的化学势及其迁移率，新形成表面的组成会发生变化。因此，作为断裂功的一部分的表面能将受到影响。这将通过结合代表机械方面的断裂功和涵盖化学方面的吉布斯吸附等温线来处理。与以前的研究相比，本研究提供了一个更普遍的，但也更简单的洞察化学力学效应。在极端情况下，在没有施加外力的情况下，晶格平面的分离或具有共同界面的两个晶体的分离发生。在平均场方法的限制下，对于脆性断裂和溶质的表面偏析，导出了断裂功的封闭解。定性地讨论了化学机械效应，包括位错或空位产生的塑性变形。(C)2015 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
During fracture new surfaces are formed by a propagating crack. Depending on the chemical potential of the constituents of a material and their mobility the composition of the newly formed surfaces changes. Thus the surface energy as part of the work to fracture will be affected. This will be treated by combining the work to fracture representing the mechanical aspect and the Gibbs Adsorption Isotherm covering the chemical aspect. Compared to previous studies the present one provides a more generalized but also a simpler insight into chemomechanical effects. In extreme cases separation of lattice planes or separation of two crystals with a common interface occurs without applied external forces. Closed solutions for the work of fracture are derived for brittle fracture and surface segregation of solutes in the limit of a mean field approach. Chemomechanical effects including plastic deformation by dislocation or vacancy generation are discussed qualitatively. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.