Tungsten recrystallization and cracking under ITER-relevant heat loads

Budaev, V.P.; Martynenko, Yu. V.; Karpov, A. V.; Belova, N. E.; Житлухин, А. М.; Климов, Н. С.; Podkovyrov, V. L.; Barsuk, V.A.; Putrik, A. B.; Yaroshevskaya, A.D.; Giniyatulin, R.; Safronov, V.M.; Khimchenko, L. N.

doi:10.1016/j.jnucmat.2014.11.129

Cited by 52 publications

(22 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Second, the laser beam thermal shock test includes beam-on and beam-off stages. During this period, a large temperature gradient would be generated on the surface of the composite, inducing that the thermal stress (tensile stress) worked on the surface of the specimen and resulted in the formation of cracks [21]. To study the detailed information of the W-TiC composite after the thermal shock test, the magnified images of selected areas were performed and are shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Microstructure evolutions of the W–TiC composite conducted by dual-effects from thermal shock and He-ion irradiation

et al. 2019

View full text Add to dashboard Cite

Considering that tungsten (W) materials served as the plasma-facing material in the fusion reactor would be exposed to edgelocalized modes (ELMs)-like thermal shock loading accompanied with He-ion irradiation, the W-TiC composite produced with a wet-chemical method was conducted by the dual effects from the laser beam thermal shock first and He-ion irradiation later in this work. The microstructure changes of the W-TiC composite before and after two tests were characterized by scanning electron microscopy or transmission electron microscopy. After the laser beam thermal shock test, there was an obvious interface on the exposed surface of the W-TiC composite. Several main cracks and melting areas could be found nearby the interface and center, respectively. Furthermore, a mixture of tungsten oxide and TiC was easy to aggregate and form into circle areas surrounding the melting area. The thermal shock tested that W-TiC composite was then subjected to the He-ion irradiation. The typical features of fuzz structures could be detected on the surface of the W-TiC composite apart from the center of the melting area. Notably, several nano-sized He bubbles deeply distributed at grain boundaries in the melting area, owing to the grain boundary functioning as the free path for He diffusion.

show abstract

Section: Methodsmentioning

confidence: 99%

Microstructure evolutions of the W–TiC composite conducted by dual-effects from thermal shock and He-ion irradiation

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Usually, W serves in high temperature and may undergo recrystallization. For example, W is considered as the plasma facing material (PFM) in future fusion reactor and will be subjected to intensive heat loads, which will result in the rapid temperature increase of W and further lead to recrystallization and grain growth [4][5][6][7]. Thus the functional and structural performance of W after recrystallization should be concerned.…”

Section: Introductionmentioning

confidence: 99%

Texture evolution of tungsten materials during recrystallization

Zhang¹,

Zheng²,

Huang³

et al. 2020

Mater. Res. Express

View full text Add to dashboard Cite

Some functional and structural performance of tungsten (W) are related to its texture characteristics. Usually, W serves in high temperature and may undergo recrystallization. Thus it's necessary to evaluate the recrystallization texture of W. In our previous studies, pure W (PW) and W-1.0wt%La 2 O 3 (WL10) were deformed via unidirectional rolling (UNR), cross rolling (CRR) and clock rolling (CLR) with 80% reduction. In the present paper, PW-UNR, PW-CRR, PW-CLR and WL10-UNR were subjected to annealing at 2073 K for 2 h to achieve recrystallization and figure out the evolution mechanism of recrystallization texture in W materials. Besides, the effect of La 2 O 3 on recrystallization texture of W was discussed. The results indicated that the fiber textures in rolling state were transformed into isolated textures after recrystallization. {001}〈uvw〉 isolated texture formed in the recrystallized W may be mainly resulted from the texture inheritance. {113}〈361〉 isolated texture formed in the recrystallized WL10-UNR may be attributed to the orientated growth of {113}〈361〉 grains with high grain boundary mobility facilitated by La 2 O 3 . Generally, isolated textures near θ-fiber were strengthened while γ-fiber was weakened for W during recrystallization, which is an effective method to achieve W with more {001} and less {111} textures.

show abstract

“…Согласно проведённым ранее исследованиям на плазменном ускорителе КСПУ-Т (ГНЦ РФ ТРИНИТИ, Россия) [3] и установке на основе электронного пучка JUDITH (Forschungszentrum Jülich, Германия) [4] установлено, что формирование трещин на поверхности вольфрама является основным механизмом разрушения вольфрама при импульсных тепловых нагрузках, лежащих ниже порога плавления его поверхности. При превышении порога плавления существенный вклад в общую эрозию вносят движение расплавленного слоя и выброс капель [5].…”

Section: Introductionunclassified