He bubbles inhibition and abnormal hardening in GH3535 alloy by niobium element addition
He bubbles inhibition and abnormal hardening in GH3535 alloy by niobium element addition
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DOI：
10.1016/j.jnucmat.2023.154841
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发表时间：
2024-02
影响因子：
3.1
通讯作者：
Chengpeng Liu;Xiang-Xi Ye;Zhenbo Zhu;Shasha Huang;Shijun Zhao;G. Lei;Lin Ge;Xiaona Zhang;Bin Leng;Hefei Huang
中科院分区：
文献类型：
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作者：
Chengpeng Liu;Xiang-Xi Ye;Zhenbo Zhu;Shasha Huang;Shijun Zhao;G. Lei;Lin Ge;Xiaona Zhang;Bin Leng;Hefei Huang
GH 3535和2重量%在750 °C下，用1.2MeV的He离子以1 × 1016，3 × 1016，1 × 1017 ions/cm ~ 2的注量辐照Nb改性的GH 3535（Nb-GH 3535）合金。微观结构的变化，包括He气泡和超晶格相的形成，以及辐射诱导硬化，通过TEM和纳米压痕进行了研究。值得注意的是，Nb-GH 3535表现出更小的尺寸和更低的数密度的He气泡，特别是在较高的注量下，表明Nb对气泡演化的抑制作用。第一性原理计算表明，Nb的存在抑制了He原子和空位的结合，降低了它们的扩散速率，从而阻碍了He气泡的成核和生长。此外，Nb的加入促进了超晶格相的辐照诱导析出，导致Nb-GH 3535合金的更高程度的总硬化。
GH3535 and 2 wt.% Nb-modified GH3535 (Nb-GH3535) alloys were irradiated with 1.2 MeV He ion at fluences of 1 × 1016, 3 × 1016and 1 × 1017ions/cm2at 750 °C. Microstructural changes, including the formation of He bubbles and superlattice phases, as well as the irradiation-induced hardening, were investigated by TEM and nanoindentation. Notably, Nb-GH3535 exhibited a smaller size and lower number density of He bubbles, especially at higher fluences, indicating the inhibitory effect of Nb on bubble evolution. First-principles calculations revealed that the presence of Nb inhibits the combination of He atoms and vacancies, reducing their diffusion rate and consequently impeding the nucleation and growth of He bubbles. Furthermore, the addition of Nb facilitates the irradiation-induced precipitation of the superlattice phase, leading to a higher degree of total hardening in Nb-GH3535 alloy.