Rate theory and experimental study of the irradiation induced defects in molybdenum alloy

Li, Fang; Chen, Cheng; Guo, Ding; Zhou, Xiong; Chen, Yiheng; Long, Yunxiang; Guo, Liping; Li, Lei; Ren, Qisen; Liao, Yehong; Liu, Tong; Shu, Rui

doi:10.1016/j.jallcom.2021.159751

Cited by 4 publications

(2 citation statements)

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“…However, when Kr 2+ ion irradiates 10-18Cr (at.%) FeCrAl alloy in situ at a slightly higher temperature of 320 • C, the dislocation loop density increased with dose, but reached saturation at 2.5 dpa [7]. The higher irradiation temperature makes the dislocation loop density saturated at a lower dose, which is consistent with the previous simulation results of loop density in Mo [28]. Therefore, the dislocation loop density is expected to reach saturation before 2.5 dpa at the higher irradiation temperature of 330 • C compared to [7].…”

Section: Size and Density Of Dislocation Loopsupporting

confidence: 90%

Ion Irradiation Defects and Hardening in FeCrAl Alloy

Long

Guo

et al. 2022

Metals

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The self-ion irradiation experiments of FeCrAl and Y−FeCrAl alloys are carried out at 330 °C to 1–10 displacements per atom (dpa). The formation of dislocation loops in these alloys is investigated by transmission electron microscopy (TEM) and nano-indentation tests are used to assess the irradiation hardening. A large number of dislocation loops are formed after irradiation, and dislocation network gradually develops above 2.5 dpa. The average size of dislocation loops increases while the number density decreases when the dose was increased. In comparison to a/2<111> dislocation loops, a<100> dislocation loops have a larger average size and higher proportion. Higher temperatures and dose rate can increase the proportion of a<100> dislocation loops. As the dose is increasing, irradiation hardening increases. The addition of yttrium increases the proportion of a<100> dislocation loops and reduces the irradiation hardening due to the high binding energy between yttrium atom and vacancy.

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Section: Size and Density Of Dislocation Loopsupporting

confidence: 90%

Ion Irradiation Defects and Hardening in FeCrAl Alloy

Long

Guo

et al. 2022

Metals

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“…Here, we propose a possible solution to the mentioned issues that could be represented by compact and defect-free high melting point oxide strengthened metallic matrix configurations, integrating highly impermeable materials (e.g., oxides and metals) applicable as hydrogen permeation barriers (HPB). It was previously reported that oxide addition to a metallic matrix could influence the recrystallization behavior [9], while brittleness phenomena could be mitigated by particle dispersion strengthening [10][11][12]. Generally, these oxide-metal structures have been successfully integrated into a wide variety of industrial applications [13][14][15][16][17], and in the last decade, their applicability in the fusion power sector gained more interest while being promoted as high-strength nuclear materials with high resistance to brittleness and permeation [18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Deposition, Morphological, and Mechanical Evaluation of W and Be-Al2O3 and Er2O3 Co-Sputtered Films in Comparison with Pure Oxides

et al. 2021

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Compact and defect-free high melting point oxide strengthened metallic matrix configurations are promising to resolve the hydrogen permeation and brittleness issues relevant to the fusion research community. Previous studies on oxide addition to metallic matrix demonstrated a mitigation in brittleness behavior, while deposition techniques and material configurations are still to be investigated. Thus, here, we report the structural, morphological, and mechanical characterization of metal-oxides thin layers co-deposited by radio frequency (RF)and direct current (DC) magnetron sputtering. A total of six configurations were deposited such as single thin layers of oxides (Al2O3, Er2O3) and co-deposition configurations as metal-oxides (W, Be)—(Al2O3, Er2O3). The study of films roughness by atomic force microscopy (AFM) method show that for Al2O3 metallic-oxides is increased to an extent that could favor gaseous trapping, while co-depositions with Be seem to promote an increased roughness and defects formation probability compared to W co-depositions. Lower elastic modulus on metal-oxide co-depositions was observed, while the indentation hardness increased for Be and decreased for W matrix configurations. These outputs are highly relevant for choosing the proper compact and trap-free configuration that could be categorized as a permeation barrier for hydrogen and furtherly studied in laborious permeation yield campaigns.

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