Evolution of plastic deformation in heavily deformed and recrystallized tungsten of ITER specification studied by TEM

被引：45
作者：
Dubinko, A. [1 ,2 ]
Terentyev, D. [1 ]
Bakaeva, A. [1 ,2 ]
Verbeken, K. [3 ]
Wirtz, M. [4 ]
Hernandez-Mayoral, M. [5 ]
机构：
[1] SCK CEN, Inst Nucl Mat Sci, Struct Mat Grp, B-2400 Mol, Belgium
[2] Univ Ghent, Dept Appl Phys, St Pietersnieuwstr 41, B-9000 Ghent, Belgium
[3] Univ Ghent, Dept Mat Text & Chem Engn, Technol Pk 903, B-9052 Ghent, Belgium
[4] Forschungszentrum Julich, Inst Energie & Klimaforsch, D-52425 Julich, Germany
[5] CIEMAT, Div Mat, E-28040 Madrid, Spain
来源：
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2017年 / 66卷
关键词：
Tungsten; Deformation; Plasticity; Dislocations; SINGLE-CRYSTALS; TEMPERATURE; INDENTATION; ALLOYS; FLOW; LAW;
D O I：
10.1016/j.ijrmhm.2017.03.004
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Microstructure induced by plastic deformation at 600 degrees C in as-fabricated and recrystallized tungsten grades of ITER specification is studied by means of transmission electron microscopy (TEM). Both grades are produced by AG Plansee and being used by fusion community as research material for plasma facing and high heat flux components. Reference microstructure was investigated by a combination of TEM, scanning electron microscopy and nano-indentation techniques. TEM was applied to investigate the necking region in the tensile samples deformed up to similar to 30% of stain. The deformation-induced microstructure was characterized and compared for the two grades in terms of the dislocation density, heterogeneity, observation of pile-ups and tangles specifically near high angle grain boundaries, The obtained evolution of the dislocation density was compared with the prediction of the previously developed thermo-mechanical model for the plastic deformation of polycrystalline tungsten and a good agreement was found without modification of the original parameter set. (C) 2017 Elsevier Ltd. All rights reserved.
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收藏
页码：105 / 115
页数：11
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