当前位置: X-MOL 学术Vacuum › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Properties of a rapidly solidified Ni–Nb layer prepared using a high-current pulsed electron beam
Vacuum ( IF 4 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.vacuum.2020.109362
Pingping Sun , Conglin Zhang , Jie Cai , Peng Lyu , Yunxue Jin , Qingfeng Guan

Abstract In this study, the surface of a bulk crystalline Ni–Nb powder metallurgy (PM) sample of a glass-forming composition was investigated using high-current pulsed electron-beam (HCPEB) irradiation, which also improved the surface properties. Unlike the original crystalline sample, X-ray diffraction (XRD) of the surface shows an amorphous phase following HCPEB exposure. Transmission electron microscopy (TEM) reveals that, after the Ni–Nb PM samples were exposed to 20 or 30 pulses of HCPEB irradiation, the re-melted layer contains localized nanocrystalline regions within an amorphous matrix. The scanning electron microscopy (SEM) results indicate that, after 30 pulses, a re-melted layer about 5 μm in thickness forms on the surface of the Ni–Nb PM samples. Meanwhile, a large number of cracks and craters were observed on the re-melted layer. In addition, the micro-hardness tests reveal that the micro-hardness improves significantly after HCPEB irradiation. The microhardness of the sample was the highest after the 30 pulses, which was 1.5 times that of the original sample. Furthermore, potentiodynamic polarization tests indicate that the irradiated samples of corrosion resistance were not enhanced compare to the initial samples, due to the formation of cracks providing a Cl− etching channel that accelerates the corrosion rate.

中文翻译:

使用高电流脉冲电子束制备的快速凝固 Ni-Nb 层的特性

摘要 在这项研究中,使用高电流脉冲电子束 (HCPEB) 辐射研究了玻璃形成成分的块状结晶 Ni-Nb 粉末冶金 (PM) 样品的表面,这也改善了表面性能。与原始结晶样品不同,在 HCPEB 暴露后,表面的 X 射线衍射 (XRD) 显示出无定形相。透射电子显微镜 (TEM) 显示,在将 Ni-Nb PM 样品暴露于 20 或 30 个脉冲 HCPEB 照射后,重新熔化的层在非晶基体中包含局部纳米晶区域。扫描电子显微镜 (SEM) 结果表明,在 30 个脉冲后,在 Ni-Nb PM 样品表面形成约 5 μm 厚的重熔层。同时,在重熔层上观察到大量裂纹和凹坑。此外,显微硬度测试表明,HCPEB辐照后显微硬度显着提高。30个脉冲后试样的显微硬度最高,是原始试样的1.5倍。此外,动电位极化测试表明,与初始样品相比,受辐照样品的耐腐蚀性没有提高,因为裂纹的形成提供了加速腐蚀速率的 Cl-蚀刻通道。
更新日期:2020-07-01
down
wechat
bug