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.

scholarly journals Damage and structural defects in the surface lager of pure molybdenum induced by high-current pulsed electron beam

2013 ◽  
Vol 62 (23) ◽  
pp. 236103
Author(s):  
Ji Le ◽  
Yang Sheng-Zhi ◽  
Cai Jie ◽  
Li Yan ◽  
Wang Xiao-Tong ◽  
...  
Keyword(s):  
Electron Beam ◽  
Structural Defects ◽  
High Current ◽  
Pulsed Electron Beam ◽  
Pure Molybdenum

SURFACE MODIFICATION OF METALLIC MATERIALS BY HIGH CURRENT PULSED ELECTRON BEAM

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1713-1718 ◽  
Author(s):  
SHENGZHI HAO ◽  
CHUANG DONG ◽  
MINCAI LI ◽  
XIANGDONG ZHANG ◽  
PINGSHENG WU
Keyword(s):  
Surface Modification ◽  
Electron Beam ◽  
Research Work ◽  
Equilibrium Temperature ◽  
Metallic Materials ◽  
High Current ◽  
Near Surface ◽  
Pulsed Electron Beam ◽  
Structure State ◽  
Working Parameters

High current pulsed electron beam (HCPEB) has been developing as a useful tool for surface modification of materials. This paper presents our research work on surface modification of metallic materials, such as mold steel, stainless steel and magnesium alloy, with a HCPEB equipment of working parameters as electron energy 27keV, pulse duration ~1µs and energy density ~5J/cm2. Investigations performed have shown that the most pronounced changes of phase-structure state and properties occurring in the near-surface layer. The formation mechanism of surface craters and their evolution regularity are discussed based on the elucidation of non-equilibrium temperature filed and different kinds of stress formed during pulsed electron beam treatment. After the HCPEB treatments, samples show significant improvements in measurements of wear and corrosion resistance.

scholarly journals Nanocrystalline Cr-Ni Alloying Layer Induced by High-Current Pulsed Electron Beam

Nanomaterials ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 74 ◽  
Author(s):  
Lingyan Zhang ◽  
Ching-Tun Peng ◽  
Jintong Guan ◽  
Peng Lv ◽  
Qingfeng Guan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electron Beam ◽  
Strengthening Mechanism ◽  
High Current ◽  
Nickel Substrate ◽  
X Ray Diffraction ◽  
Pulsed Electron Beam ◽  
Solid Solution Strengthening ◽  
Transmission Electron ◽  
Solution Strengthening

In this investigation, chromium (Cr) was adopted as an alloying element on a nickel substrate, and the alloying process was materialized via high-current pulsed electron beam (HCPEB) irradiation. X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were also conducted for microstructure characterization. The results showed that after HCPEB irradiation a nanocrystalline Cr-Ni alloying layer was formed and numerous dislocations were generated, resulting in a great deal of diffusion paths for Cr elements. Moreover, properties including hardness, wear and electrochemical performance were significantly improved after HCPEB irradiation, which was mainly due to the formation of the nanocrystalline Cr–Ni alloying layer. In addition, each strengthening mechanism that contributed to the hardness of the HCPEB-irradiated sample was mathematically analyzed, and solid solution strengthening was found to be of great importance.

Microstructures and Properties of AISI 304L Stainless Steel Irradiated by High-Current Pulsed Electron Beam

2013 ◽  
Vol 787 ◽  
pp. 19-23
Author(s):  
Zai Qiang Zhang ◽  
Sheng Zhi Yang ◽  
Yan Li ◽  
Xiao Tong Wang ◽  
Xiu Li Hou ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Electron Beam ◽  
304L Stainless Steel ◽  
Metallic Materials ◽  
High Current ◽  
Aisi 304L ◽  
Pulsed Electron Beam ◽  
Aisi 304L Stainless Steel ◽  
The Relationship

AISI 304L austenite stainless steel was irradiated by a high-current pulsed electron beam (HCPEB) source in different process. The microstructures were investigated in detail by electron microscopy. The changes of hardness and corrosion resistance induced by irradiation were also tested. The relationship between corrosion resistance and the microstructures has been explored. The experimental results demonstrate the potential of proper HCPEB processing for improving the hardness and corrosion resistance of metallic materials.

scholarly journals Amorphization and Nano-Crystallization of Ni-Nb Coating on GH3039 Alloys by High Current Pulsed Electron Beam

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 347
Author(s):  
Conglin Zhang ◽  
Xuesu Ji ◽  
Jiahong Wang ◽  
Lingfan Lu ◽  
Zirun Yang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Beam ◽  
Amorphous Layer ◽  
Pulse Number ◽  
Nano Particles ◽  
High Current ◽  
Pulsed Electron Beam ◽  
Transmission Electron ◽  
Pulsed Irradiation

In this paper, the Ni-Nb coatings were successfully prepared onto the GH3039 alloys by High current pulsed electron beam (HCPEB). The transmission electron microscopy (TEM) results confirmed that the Ni-Nb layer of 10-pulsed samples exhibited partial amorphization, which was consisted of γ-Ni particles, rod-like Ni3Nb particles and nano Ni3Nb with 30 nm in size. After 20-pulsed irradiation, the results show that only Ni3Nb clusters with around 3 nm in size were dispersed in fully amorphization layer. With increased pulse number to 30, the nano-particles embedded into the amorphous layer were grown up, the size of which was about 8 nm. The microstructure evolution during HCPEB irradiation was from the partial amorphous to fully amorphous and then to nano-crystallization. The 20-pulsed samples possessed the best hardness and corrosion resistance. The ultrafine clusters uniformly embedded into amorphous layer were main reason for improving properties.

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