Revisiting hydrogen embrittlement models and hydrogen-induced homogeneous nucleation of dislocations
Revisiting hydrogen embrittlement models and hydrogen-induced homogeneous nucleation of dislocations
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DOI：
10.1016/j.scriptamat.2009.09.037
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发表时间：
2010-01-01
影响因子：
6
通讯作者：
Kirchheim, Reiner
中科院分区：
文献类型：
--
作者：
Kirchheim, Reiner
解释氢脆所造成的增强局部塑性模型进行了讨论，在一个新的概念描述溶质缺陷相互作用的热力学框架。溶质原子在具有过量γ的缺陷处偏析被称为缺陷剂，因为它们降低缺陷γ的缺陷形成能，类似于表面活性剂与表面的作用。相应的减少量由d γ =-γ d μ给出，其中μ是破坏剂的化学势。这个方程适用于最近的纳米压痕结果，并揭示了一个较低的能量障碍的位错环的存在下，氢的产生。(C)2009 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Models explaining hydrogen embrittlement as caused by enhanced local plasticity are discussed in the light of a novel concept describing solute-defect interaction in a thermodynamic framework. Solute atoms segregating at defects with an excess Gamma are called defactants because they lower the defect formation energy of defects gamma, analagous to the action of surfactants with surfaces. The corresponding decrease is given by d gamma = -Gamma d mu, where mu is the chemical potential of the defactant. This equation is applied to recent nanoindentation results, and reveals a lower energy barrier for the generation of dislocation loops in the presence of hydrogen. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.