Tensile stress-driven cracking of W fuzz over W crystal under fusion-relevant He ion irradiations

被引：31

作者：

Fan, Hongyu ^{[1
]}

Zhang, Yang ^{[1
,2
]}

Liu, Dongping ^{[1
,2
]}

Niu, Chunjie ^{[2
]}

Liu, Lu ^{[2
]}

Ni, Weiyuan ^{[1
]}

Xia, Yang ^{[3
]}

Bi, Zhenhua ^{[1
]}

Hong, Yi ^{[1
]}

Benstetter, Guenther ^{[4
]}

Lei, Guangjiu ^{[5
]}

机构：

[1] Dalian Minzu Univ, Sch Phys & Mat Engn, Dalian 116600, Peoples R China

[2] Dalian Univ Technol, Sch Elect Engn, Dalian 116024, Peoples R China

[3] Liaoning Normal Univ, Sch Phys & Elect Technol, Dalian 116029, Peoples R China

[4] Deggendorf Inst Technol, Fac Elect Engn & Media Technol, D-94469 Deggendorf, Germany

[5] Southwestern Inst Phys SWIP, Chengdu 610225, Sichuan, Peoples R China

来源：

NUCLEAR FUSION | 2020年 / 60卷 / 04期

基金：

美国国家科学基金会;

关键词：

tensile stress; ion irradiations; W fuzz; He bubble; FRACTURE-MECHANISM MAPS; BUBBLE-GROWTH; LOW-ENERGY; TUNGSTEN; METALS; FCC;

D O I：

10.1088/1741-4326/ab71bb

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Although W fuzz is formed in the divertor region of the fusion reactor, no theory may clearly explain the W fuzz growth mechanism. In this study, we observe the growth process of W fuzz over W crystal under ITER-relevant He ion irradiations. We propose the tensile stress-driven cracking of nano-structured fuzz during the initial growth of W fuzz. We demonstrate that the existence of tensile stress is due to the swelling of He nano-bubbles in the fuzz. After this cracking, the W fuzz breaks away from the planar network and grows over the W surface, where the micro-stress in the W surface layer acts as the driving force.

引用

页数：9

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