Subsurface morphology changes due to deuterium bombardment of tungsten

被引：113

作者：

Lindig, S. ^{[1
]}

Balden, M. ^{[1
]}

Alimov, V. Kh ^{[2
]}

Yamanishi, T. ^{[2
]}

Shu, W. M. ^{[3
]}

Roth, J. ^{[1
]}

机构：

[1] Max Planck Inst Plasma Phys, EURATOM Assoc, D-85748 Garching, Germany

[2] Japan Atom Energy Agcy, Tritium Technol Grp, Ibaraki 3191195, Japan

[3] ITER Int Org, F-13108 St Paul Les Durance, France

来源：

PHYSICA SCRIPTA | 2009年 / T138卷

关键词：

PLASMA-FACING MATERIALS; HIGH-FLUX; BLISTER FORMATION; LOW-ENERGY; HYDROGEN RETENTION; SURFACE; CARBON; IRRADIATION; DESORPTION; IMPURITIES;

D O I：

10.1088/0031-8949/2009/T138/014040

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Recrystallized polycrystalline tungsten was exposed to a deuterium plasma beam with high flux (10(22) Dm(-2) s(-1)) and low energy (38 eVD(-1)) to fluences up to 10(27) Dm(-2). The sample temperature was varied between 320 and 800 K. The three-dimensional morphology of blister-like structures and the grain orientation were investigated by scanning electron microscopy combined with focused ion beam cross-sectioning and electron backscattering diffraction. Cracks with distorted areas (<650 K) and large cavities (100-1000 mu m(3)) at grain boundaries (>480 K) were observed beneath the surface. The surface blister-like structures and the defects underneath are correlated along crystallographic orientation of the W grains in accordance to the low-indexed slip system {110} < 111 >. The defects are mobile and accumulate under deuterium loading. Samples exposed near room temperature do not form such large cavities by subsequent heating up to 1300 K. Deuterium bombardment above 700K does not lead to blister-like structures.

引用

页数：5

共 34 条

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