Hydrogen diffusivity of Nb56-xWxTi23Co21 alloys under non-dilute conditions and its analysis based on hydrogen chemical potential
Hydrogen diffusivity of Nb56-xWxTi23Co21 alloys under non-dilute conditions and its analysis based on hydrogen chemical potential
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Nb56-xWxTi23Co21合金非稀释条件下的氢扩散系数及其基于氢化学势的分析
DOI：
10.1016/j.jallcom.2019.05.324
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发表时间：
2019-08
影响因子：
6.2
通讯作者：
Dongmei Liu
中科院分区：
文献类型：
--
作者：
Kunjun Zhu;Xinzhong Li;Yuxin Yang;Ruirun Chen;Yanqing Su;Jingjie Guo;Dongmei Liu
研究了Nb_（56-x）W_xTi_（23）Co_（21）（x = 0，5，10）合金的显微组织和渗氢性能。从非稀释条件下氢的化学势角度讨论了W对Nb 56-xWxTi 23 Co21合金氢扩散率的合金化作用。所有铸锭均由初生bcc-（Nb）和共晶（bcc-（Nb）+B2-TiCo）组织组成。氢渗透通量J与PCT因子fPCT之间呈线性关系，由此估算出氢扩散系数。W替代Nb导致本征氢扩散系数D_（max）的提高。随着W含量的增加，氢原子在稳定间隙位之间跳跃的势垒逐渐降低。浓度依赖的扩散系数D随着氢浓度的增加而增加。
Microstructure and hydrogen permeation of Nb56-xWxTi23Co21(x = 0, 5, 10) alloys have been investigated. The alloying effect of W on the hydrogen diffusivity of Nb56-xWxTi23Co21alloys was discussed from a perspective of the chemical potential of hydrogen under non-dilute condition. All as-cast ingots were consisted of primary bcc-(Nb) and eutectic (bcc-(Nb)+B2-TiCo) structure. The relation between the hydrogen permeation fluxJand the PCT factorfPCTis linear, from which the hydrogen diffusion coefficients were evaluated. The substituting Nb by W leads to improved intrinsic hydrogen diffusion coefficientD∗. With increasing W content, the potential barrier for hydrogen atoms hopping between stable interstitial sites gradually decreases. The concentration-dependent diffusion coefficientDincreases with increasing hydrogen concentration.
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