材料科学
氦
气泡
脆化
硬化(计算)
软化
打滑(空气动力学)
聚结(物理)
极限抗拉强度
复合材料
临界切应力
机械
热力学
原子物理学
剪切速率
物理
图层(电子)
天体生物学
粘度
作者
Si‐Mian Liu,Shihao Li,Wei‐Zhong Han
标识
DOI:10.1016/j.jmst.2019.03.015
摘要
Radiation-induced helium bubbles are detrimental to the mechanical properties of metals, usually causing severe hardening and embrittlement. Hexagonal close-packed (HCP) α-Zr alloys are one of the primary structural materials for nuclear applications, however, the effect of helium bubbles on their deformation and fracture behaviors still remains unexplored. Here, we found that ordered helium bubbles prefer to align along the basal plane in HCP α-Zr. Micro-scale in situ tensile tests revealed that helium bubbles less than 8 nm in size can increase the critical resolved shear stress of the prismatic slip. However, once the helium bubbles are larger than 8 nm, a bubble-softening effect happens due to a decrease in number density of helium bubbles and an increase in porosity. Once the Schmid factor of basal slip is considerably higher than prismatic slip, bubble coalescence along the basal plane becomes the major failure mode in helium-irradiated α-Zr.
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