Investigation on the deformation mechanisms and size-dependent hardening effect of He bubbles in 84 dpa neutron irradiated Inconel X-750

被引：13

作者：

Wang, Qiang ^{[1
]}

Judge, Colin D. ^{[2
]}

Howard, Cameron ^{[2
]}

Mattucci, Mitchell ^{[1
]}

Rajakumar, Heygaan ^{[1
]}

Hoendermis, Seanna ^{[1
]}

Dixon, Chris ^{[1
]}

Daymond, Mark R. ^{[3
]}

Bickel, Grant ^{[1
]}

机构：

[1] Canadian Nucl Labs CNL, 286 Plant Rd, Chalk River, ON K0J 1J0, Canada

[2] Idaho Natl Lab, 1955 N Fremont Ave, Idaho Falls, ID 83415 USA

[3] Queens Univ, Dept Mech & Mat Engn, Kingston, ON K7L 3N6, Canada

来源：

NUCLEAR MATERIALS AND ENERGY | 2021年 / 28卷

关键词：

CANDU; Inconel X-750; Helium bubbles: irradiation hardening; Deformation mechanism; MICROSTRUCTURAL EVOLUTION; DISLOCATION; HELIUM; IRON;

D O I：

10.1016/j.nme.2021.101025

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Microstructural characterization and calculation of how several intrinsic features contribute to the mechanical properties of highly strained Inconel X-750 alloy specimens irradiated to 84 dpa at two distinct temperature ranges (300 degrees C-330 degrees C and 120 degrees C-280 degrees C) were performed. The individual contributions of different microstructural features to the critical resolved shear stress (CRSS) of the material, including the gamma matrix, gamma' precipitates, irradiation induced defects, and helium bubbles, were calculated. The obstacle strength of He bubbles was found to be size-dependent and a critical size was determined. For bubbles < 2.4 nm, the obstacle strength is only approximately 0.03 while it can be as high as 0.55 for bubbles > 6.6 nm. In the high temperature range (300-330 degrees C) irradiated specimen, localised dislocation slip was found responsible for the failure of the specimen during micro-tensile testing, associated with significant helium bubble elongation. Elongation of helium bubbles on both the primary and adjacent secondary {111} planes was likely induced by the cross slip of screw dislocations. Nanotwins were also found adjacent to the shear failure surface in the high temperature specimen, but no elongated bubbles were found within the nano-twinned region. In the low temperature range (120-280 degrees C) irradiated highly strained specimen, a dislocation network structure was revealed.

引用

页数：11

共 1 条

[1] Effect of He-irradiation fluence on the size-dependent hardening and deformation of nanostructured Mo/Zr multilayers
Wu, S. H.
Cheng, P. M.
Wu, K.
Hou, Z. Q.
Wang, Y. Q.
Liang, X. Q.
Li, J.
Kuang, J.
Zhang, J. Y.
Liu, G.
Sun, J.
INTERNATIONAL JOURNAL OF PLASTICITY, 2018, 111 : 36 - 52

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