Surface Cracking Behaviors of Ultra-Fine Grained Tungsten Under Edge Plasma Loading in the HT-7 Tokamak

ZHU Dahuan (朱大焕); LIU Yang (刘洋); CHEN Junling (陈俊凌); ZHOU Zhangjian (周张健); YAN Rong (鄢容)

doi:10.1088/1009-0630/15/6/21

Plasma Science and Technology > 2013 > 15(6): 605-608. > DOI: 10.1088/1009-0630/15/6/21

ZHU Dahuan (朱大焕), LIU Yang (刘洋), CHEN Junling (陈俊凌), ZHOU Zhangjian (周张健), YAN Rong (鄢容). Surface Cracking Behaviors of Ultra-Fine Grained Tungsten Under Edge Plasma Loading in the HT-7 Tokamak[J]. Plasma Science and Technology, 2013, 15(6): 605-608. DOI: 10.1088/1009-0630/15/6/21

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Surface Cracking Behaviors of Ultra-Fine Grained Tungsten Under Edge Plasma Loading in the HT-7 Tokamak

1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China 2 University of Science and Technology Beijing, Beijing 100083, China

Funds: supported by the Key Project of Chinese Academy of Sciences (No. KJCX2-YW-N35) and National Natural Science Foundation of China (No. 11175205)

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Received Date: January 08, 2012

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Abstract

Abstract

Tests of the candidate plasma facing materials (PFMs) used in experimental fu- sion devices are essential due to the direct in°uence of in-situ plasma loading. A type of ultra- fine grained (UFG) tungsten sintered by resistance sintering under ultra-high pressure (RSUHP) method has been exposed in the edge plasma of the HT-7 tokamak to investigate its performance under plasma loading. Under cyclic edge plasma loading, the UFG tungsten develops both macro and micro cracks. The macro cracks are attributed to the low temperature brittleness of the tung- sten material itself, while the micro cracks are generated from local intense power flux deposition.
- ultra-fine grain tungsten,
- plasma facing materials,
- cracking behaviors,
- plasma irradiation

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