Hydrogen diffusion in ultrafine-grained palladium: Roles of dislocations and grain boundaries

被引：74
|
作者：
Iwaoka, Hideaki [1 ,2 ]
Arita, Makoto [1 ]
Horita, Zenji [1 ,2 ]
机构：
[1] Kyushu Univ, Fac Engn, Dept Mat Sci & Engn, Fukuoka 8190395, Japan
[2] Kyushu Univ, WPI, Int Inst Carbon Neutral Energy Res, Fukuoka 8190395, Japan
来源：
ACTA MATERIALIA | 2016年 / 107卷
关键词：
High-pressure torsion; Grain boundary diffusion; Palladium; Hydrogen; HIGH-PRESSURE TORSION; ELECTROCHEMICAL METHODS; NANOCRYSTALLINE NICKEL; MECHANICAL-PROPERTIES; THERMAL-ANALYSIS; PURE ALUMINUM; DEFORMED IRON; PERMEATION; METALS; TRANSPORT;
D O I：
10.1016/j.actamat.2016.01.069
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Diffusion behavior of hydrogen in ultrafine-grained palladium (Pd) is investigated by electrochemical permeation tests. The ultrafine-grained structure is produced by severe plastic deformation through high-pressure torsion (HPT). The diffusion behavior is compared with an annealed state with a coarse grained structure and a cold-rolled state with dislocations and subgrain structures. Hydrogen permeation is analyzed in absorption step and desorption step at five different temperatures in the range of 15 -35 degrees C. Hydrogen diffusion is retarded due to hydrogen trapping by dislocations. Grain boundaries act as rapid diffusion paths for hydrogen so that hydrogen diffusion is enhanced in the HPT-processed Pd samples with the ultrafine-grained structures. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：168 / 177
页数：10
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