Formation of superabundant vacancies in M-H alloys and some of its consequences: a review
Formation of superabundant vacancies in M-H alloys and some of its consequences: a review
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DOI：
10.1016/s0925-8388(02)01269-0
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发表时间：
2003-08-11
影响因子：
6.2
通讯作者：
Fukai, Y
中科院分区：
文献类型：
--
作者：
Fukai, Y
过剩空位（SAVs）是指在M-H合金中形成的浓度小于或等于30 at.%的M原子空位。在介绍了高温高氢压下SAV形成的X射线衍射（XRD）结果后，描述了SAV的空位-氢（Vac-H）团簇形成机制，包括Vac-H相互作用的基本信息。该理论最重要的结论之一是，含有SAV的缺陷结构实际上是M-H合金中最稳定的结构，因此只要动力学允许，SAV就应该形成。随后表明，SAVs可以在电沉积过程中形成。SAV的形成，包括M-原子扩散和蠕变的增强的一些后果进行了描述，并提到其可能的影响钢的氢脆。(C)2002 Elsevier B. V.保留所有权利。
Superabundant vacancies (SAVs) are the vacancies of M atoms formed in M-H alloys, of concentrations as large as less than or equal to30 at.%. After presenting some results of SAV formation as revealed by X-ray diffraction (XRD) at high temperatures and high hydrogen pressures, its mechanism in terms of vacancy-hydrogen (Vac-H) cluster formation is described, including the underlying information of Vac-H interactions. One of the most important conclusions of the theory is that defect structures containing SAVs are in fact the most stable structure of M-H alloys, and therefore SAVs should be formed whenever the kinetics allow. It is shown subsequently that SAVs can be formed in the process of electrodeposition. Some of the consequences of SAV formation including the enhancement of M-atom diffusion and creep are described, and its possible implication for hydrogen embrittlement of steels is mentioned. (C) 2002 Elsevier B.V. All rights reserved.