Deformation mechanism and microstructures on polycrystalline aluminum induced by high-current pulsed electron beam

Cai, Jie; Ji, Le; Yang, Shuai; Wang, Xiaotong; Li, Yan; Hou, Xiuli; Guan, Qingfeng

doi:10.1007/s11434-013-5848-5

Cited by 15 publications

(3 citation statements)

References 26 publications

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“…Additionally, considerable fine nano-silicon grains precipitated at grain boundaries and sub-grain boundaries of Al cellular structures. The formations of these two structures were related to sharp heating and cooling in the process of HCPEB radiation, just as in the case of nanoscale primary silicon phase [35,36].…”

Section: Tem Analysis Of the Hcpeb-processed Al-175si-03nd Metallic M...mentioning

confidence: 88%

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

Gao

et al. 2020

Coatings

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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.

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Section: Tem Analysis Of the Hcpeb-processed Al-175si-03nd Metallic M...mentioning

confidence: 88%

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

Gao

et al. 2020

Coatings

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“…High-current pulsed electron beam (HCPEB) has been successfully developed as an efficient surface modification technique of different materials in recent years. − During HCPEB irradiation, the high-density electron pulses of short duration can introduce different physical processes in the surface layer, such as rapid melting–solidification, evaporation–condensation as well as surface smoothing and annealing. These nonequilibrium processes can easily change the surface morphologies, microstructures, chemical compositions, phase structures, and stress states at the surface.…”

Section: Introductionmentioning

confidence: 99%

Thermal Cycling Behavior of Thermal Barrier Coatings with MCrAlY Bond Coat Irradiated by High-Current Pulsed Electron Beam

Cai

Guan

et al. 2016

ACS Appl. Mater. Interfaces

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Microstructural modifications of a thermally sprayed MCrAlY bond coat subjected to high-current pulsed electron beam (HCPEB) and their relationships with thermal cycling behavior of thermal barrier coatings (TBCs) were investigated. Microstructural observations revealed that the rough surface of air plasma spraying (APS) samples was significantly remelted and replaced by many interconnected bulged nodules after HCPEB irradiation. Meanwhile, the parallel columnar grains with growth direction perpendicular to the coating surface were observed inside these bulged nodules. Substantial Y-rich AlO bubbles and varieties of nanocrystallines were distributed evenly on the top of the modified layer. A physical model was proposed to describe the evaporation-condensation mechanism taking place at the irradiated surface for generating such surface morphologies. The results of thermal cycling test showed that HCPEB-TBCs presented higher thermal cycling resistance, the spalling area of which after 200 cycles accounted for only 1% of its total area, while it was about 34% for APS-TBCs. The resulting failure mode, i.e., in particular, a mixed delamination crack path, was shown and discussed. The irradiated effects including compact remelted surface, abundant nanoparticles, refined columnar grains, Y-rich alumina bubbles, and deformation structures contributed to the formation of a stable, continuous, slow-growing, and uniform thermally grown oxide with strong adherent ability. It appeared to be responsible for releasing stress and changing the cracking paths, and ultimately greatly improving the thermal cycling behavior of HCPEB-TBCs.

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“…However, in some alloys the σ-ε curves are apparently independent of the strain rate, even at the level of dynamic deformation [7]. The structural behavior of most metals also shows different aspects in dynamic tests as compared to quasi-static ones: (a) slip bands are less sharp but more densely dispersed [8], and (b) twinning [9] and phase transformations [10] are more likely to occur. On the other hand, results in polycrystalline copper failed to show these structural differences [11].…”

Section: Introductionmentioning

confidence: 99%

Work Hardening and Microstructural Effect during Dynamic Deformation of Polycrystalline Copper

Monteiro

Cândido

Luz

et al. 2016

MSF

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Dynamic deformation of metals in the elevated strain rate interval of elastic-plastic wave propagation is relevant to technological conditions, such as structural response to impact, ballistic effects, and metal forming processes. In the present work, the work hardening of quasi-static and dynamically deformed copper using a split pressure bar was evaluated for two different grain sizes. From slip lines observations in conditions of both dynamic and quasi-static strain rates, as well as an insensitivity to grain size of the yield stress, it is suggested that copper behave like a single crystal under dynamic deformation. It is shown, for the first time, that the work hardening rate during dynamic deformation of polycrystalline copper remains higher up to the fracture.

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Deformation mechanism and microstructures on polycrystalline aluminum induced by high-current pulsed electron beam

Cited by 15 publications

References 26 publications

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

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

Thermal Cycling Behavior of Thermal Barrier Coatings with MCrAlY Bond Coat Irradiated by High-Current Pulsed Electron Beam

Work Hardening and Microstructural Effect during Dynamic Deformation of Polycrystalline Copper

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