Evolution of helium bubbles in nickel-based alloy by post-implantation annealing

• 作者: Rui Zhu Qin Zhou Li Shi Li-Bin Sun Xin-Xin Wu Sha-Sha Lv Zheng-Cao Li
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: SPECIAL TOPIC—Ion beam modification of materials and applications
• 页码范围: 60-66
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/ac0783

摘要

Nickel-based alloys have been considered as candidate structural materials used in generation IV nuclear reactors serving at high temperatures.In the present study,alloy 617 was irradiated with 180-keV helium ions to a fluence of 3.6× 1017 ions/cm2 at room temperature.Throughout the cross-section transmission electron microscopy (TEM) image,numerous over-pressurized helium bubbles in spherical shape are observed with the actual concentration profile a little deeper than the SRIM predicted result.Post-implantation annealing was conducted at 700 ℃ for 2 h to investigate the bubble evolution.The long-range migration of helium bubbles occurred during the annealing process,which makes the bubbles of the peak region transform into a faceted shape as well.Then the coarsening mechanism of helium bubbles at different depths is discussed and related to the migration and coalescence (MC) mechanism.With the diffusion of nickel atoms slowed down by the alloy elements,the migration and coalescence of bubbles are suppressed in alloy 617,leading to a better helium irradiation resistance.