scholarly journals Spheroidization Behavior of Nano-Primary Silicon Induced by Neodymium under High-Current Pulsed Electron Beam Irradiation

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1408
Author(s):  
Liang Hu ◽  
Kui Li ◽  
Bo Gao ◽  
Ning Xu ◽  
Zhuang Liu ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Silicon Crystal ◽  
Primary Silicon ◽  
Crystal Plane ◽  
High Current ◽  
Silicon Phase ◽  
Tribological Test ◽  
Pulsed Electron Beam ◽  
Study Results

The spheroidization behavior of the nano-primary silicon phase induced by Nd under high-current pulsed electron beam (HCPEB) irradiation was investigated in this study. The study results revealed that, compared to the Al–17.5Si alloy, spheroidized nano-primary silicon phase emerged in the alloy’s HCPEB-irradiated surface layer due to the presence of Nd. Because Nd was abundantly enriched on the fast-growing silicon crystal plane, its surface tension was reduced under the extreme undercooling caused by HCPEB irradiation, causing the growth velocity of each crystal plane to be the same and spherical nanometers of silicon to appear. The spheroidization of nano-primary silicon phases occurred in the remelted layer. The microhardness test revealed that Nd could depress the microhardness of the Al matrix at the same number of pulses, but conversely increase the microhardness of the primary silicon phase, compared to the Al–17.5Si alloy. The tribological test showed that the presence of spherical nano-primary silicon could significantly improve the alloy’s tribological property.

Blue photoluminescent Si nanocrystals prepared by high-current pulsed electron beam irradiation

RSC Advances ◽  
2013 ◽  
Vol 3 (39) ◽  
pp. 17998 ◽  
Author(s):  
Peng Lv ◽  
Zaiqiang Zhang ◽  
Xiaotong Wang ◽  
Xiuli Hou ◽  
Qingfeng Guan
Keyword(s):  
Electron Beam ◽  
Electron Beam Irradiation ◽  
High Current ◽  
Beam Irradiation ◽  
Pulsed Electron Beam ◽  
Si Nanocrystals

scholarly journals The Influence of Neodymium Element on the Crater Structure Formed on Al-17.5Si Alloy Surface Processed by High-Current Pulsed Electron Beam

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 922
Author(s):  
Kui Li ◽  
Bo Gao ◽  
Ning Xu ◽  
Yue Sun ◽  
Vladimir Viktorovich Denisov ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electron Beam ◽  
Primary Silicon ◽  
Structural Defects ◽  
Metallic Materials ◽  
High Current ◽  
Metallic Material ◽  
Pulsed Electron Beam ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis

The effect of neodymium element on the elimination of crater structures on the surface of Al-17.5Si metallic materials processed by high-current pulsed electron beam was investigated in this study. Field emission scanning electron microscopy analysis indicated that the grain sizes of Al-17.5Si metallic materials were reduced and craters were removed from surfaces of the processed Al-17.5Si metallic material after addition of Nd. This can be attributed to the efficient transfer of heat accumulated in rich-silicon (primary silicon) areas without the eruption of a primary silicon phase if the size of primary silicon grains are small. The X-ray diffraction analysis indicates that all diffraction peaks are broadened because of the presence of structural defects, grain refinement and stress state. Electron probe micro-analyzer analysis demonstrated that Al and Nd were evenly distributed on the surface of the treated alloy, which could be attributed to the diffusion of the element. Transmission electron microscopy analysis showed that nano-Al and nano-Si cellular textures were generated during the treated process. The formation of these structures can be attributed to rapid heating and cooling effects by the treatment. Finally, electrochemical tests revealed that the corrosion current density of Al-17.5Si metallic materials (with Nd, 0.3 wt.%.) surface decreased by three orders of magnitude compared with that of the processed Al-17.5Si metallic material surfaces (without Nd). This can be attributed to the elimination of craters and grain refining.

Microstructures of pure nickel induced by high-current pulsed electron beam irradiation

2016 ◽  
Vol 52 (5) ◽  
pp. 869-875 ◽  
Author(s):  
Conglin Zhang ◽  
Yuanwang Zhang ◽  
Nana Tian ◽  
Shi Chen ◽  
Zhen Qian ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Pure Nickel ◽  
High Current ◽  
Beam Irradiation ◽  
Pulsed Electron Beam

scholarly journals Microstructure and Properties of Mechanical Alloying Al-Zr Coating by High Current Pulsed Electron Beam Irradiation

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2398
Author(s):  
Xiangcheng Li ◽  
Huiru Liu ◽  
Nana Tian ◽  
Conglin Zhang ◽  
Peng Lyu ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Pure Aluminum ◽  
Surface Hardness ◽  
Alloyed Layer ◽  
High Current ◽  
Beam Irradiation ◽  
Pulsed Electron Beam ◽  
Al Coating ◽  
Aluminum Material

The “HOPE-I” type high-current pulsed electron beam (HCPEB) equipment was used to irradiate the pure aluminum material with Zr coating preset by ball milling to realize the alloying of a Zr–Al coating surface. The microstructure and phase analysis were conducted by XRD, SEM, and TEM. The experimental results show that after Zr alloying on the Al surface by HCPEB, a layer of 15 μm was formed on the surface of the sample, which was mainly composed of Zr and Al–Zr intermetallic compounds. A large number of Al3Zr (Ll2) particles was uniformly distributed in the alloyed layer, and the Al grains were obviously refined. In addition, the surface hardness and corrosion resistance of the samples were improved significantly after HCPEB irradiation.

Microstructural Modification of Brush-Plated Nanocrystalline Cr by High Current Pulsed Electron Beam Irradiation

2016 ◽  
Vol 41 ◽  
pp. 87-95 ◽  
Author(s):  
Jian Jun Hu ◽  
Lin Jiang Chai ◽  
Hong Bin Xu ◽  
Chao Ping Ma ◽  
Shu Bin Deng
Keyword(s):  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Thermal Stresses ◽  
Electron Beam Treatment ◽  
High Current ◽  
Beam Irradiation ◽  
Pulsed Electron Beam ◽  
Small Nodule ◽  
Before And After ◽  
Surface Microstructures

Cr layer was fabricated on 40Cr steel by electric brush plating process and then treated by high current pulsed electron beam irradiation technique. Surface microstructures of specimens before and after the irradiation were investigated. Results show that Cr surface is composed of uniformly distributed small nodule units which are composed of fine Cr particles smaller than 100nm. After high current pulsed electron beam treatment, many cracks are found on surface. The main reason is possibly due to the quasi-static thermal stresses accumulated along the surface of the specimens during the electron beam treatment. The surface grain grow from Cr particles because of heating by electron beam, and their size is less than 200nm.

Sign in / Sign up

Export Citation Format

Share Document