Grain refinement, hardening and metastable phase formation by high current pulsed electron beam (HCPEB) treatment under heating and melting modes

Grosdidier, Thierry; Zou, Jianxin; Bolle, Bernard; Hao, Shuang; Chen, Dong

doi:10.1016/j.jallcom.2010.04.010

Cited by 56 publications

(22 citation statements)

References 33 publications

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“…In this paper, halo formation on the surfaces of hypereutectic Al-17.5Si alloys was observed and characterized after bombardment with a high-current pulsed electron beam (HCPEB). HCPEB bombardment has been investigated as a potential method for surface modification of materials in recent years [8][9][10][11][12]. Alloy surfaces are prone to nanocrystallization due to the rapid melting and cooling processes induced by HCPEB.…”

Section: Introductionmentioning

confidence: 99%

Halo Evolution of Hypereutectic Al‐17.5Si Alloy Treated with High‐Current Pulsed Electron Beam

Gao

et al. 2015

Journal of Nanomaterials

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Halo evolution of an Al-17.5Si alloy surface after treatment with increasing pulse numbers of a high-current pulsed electron beam (HCPEB) was investigated. A halo is a ring microstructure resembling a bull’s eye. SEM results indicate that the nanocrystallization of halo induced by HCPEB treatment leads to gradual diffusion of the Si phase. Multiple pulses numbers cause the Si phase to be significantly refined and uniformly distributed. In addition, nanosilicon particles with a grain size of 30~100 nm were formed after HCPEB treatment, as shown by TEM observation. XRD results indicate that Si diffraction peaks broadened after HCPEB treatment. The microhardness tests demonstrate that the microhardness at the midpoint from the halo edge to center decreased sharply from 9770.7 MPa at 5 pulses to 2664.14 MPa at 25 pulses. The relative wear resistance of a 15-pulse sample is effectively improved by a factor of 6.5, exhibiting optimal wear resistance.

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Section: Introductionmentioning

confidence: 99%

Halo Evolution of Hypereutectic Al‐17.5Si Alloy Treated with High‐Current Pulsed Electron Beam

Gao

et al. 2015

Journal of Nanomaterials

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“…Finally, a propagation of stress wave, caused by pulsed heating, can lead to forming the thick-(≥100 μm) hardened surface layer [2,3,6,16]. The interesting new results of investigation of the surface treatment of steels and alloys with LEHCEBs have been presented in [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Surface Modification and Alloying of Aluminum and Titanium Alloys with Low-Energy, High-Current Electron Beams

Ротштейн

Шулов

2011

Journal of Metallurgy

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The paper reviews the results of investigations of surface modification and alloying of Al, Ti, and its alloys with a low-energy (up to ∼40 keV), high-current (up to 25 J/cm 2 ) electron beams of microsecond duration under systematically varied conditions. The microstructural evolution of the surface layers of Al alloys (Al2024 and Al6061) and Ti-6Al-4V alloy subjected to pulsed melting as well as changes in surface-sensitive properties of these alloys are considered. Phase formation and properties of Albased and Ti-based surface alloys, synthesized by liquid-phase mixing of multilayer film-substrate systems in wide range of solid solubility, including [Al/Si]/Al, [Al/C]/Al, [Zr/Ti]/Ti-6Al-4V, and Al/Ti, are studied. In case of Ti-based substrates, this method allows to fabricate the single-phase nanocrystalline α-(TiZr) surface alloy, free of Al and V, as well as nanosized and ultrafine grain TiAl/Ti 3 Al-based surface alloys of thickness ≥3 μm with enhanced mechanical properties.

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“…Large-area electron beam (LAEB) irradiation, a recent variant of electron beam treatment, has several advantages such as a large beam size (~60 mm in diameter) which decreases processing time by decreasing the need for overlapping tracks. It has been used to polish mould surfaces [7], increase hardness and wear resistance [8], lower surface roughness, reduce the porosity of sprayed coatings [9] and, as demonstrated in our previous paper [10], generate an amorphous layer when used to melt the surface of a cast Al-Co-Ce alloy. However, cracking of the amorphous layers was found to occur around large, pre-existing particles of the Al 8 Co 2 Ce phase.…”

Section: Introductionmentioning

confidence: 94%

Effect of prior laser microstructural refinement on the formation of amorphous layer in an Al86Co7.6Ce6.4 alloy

Murray

Voisey

et al. 2014

Applied Surface Science

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Laser surface melting (LSM) pre-treatment was conducted before large area electron beam (LAEB) treatment in an attempt to eliminate the cracking of the amorphous layer. In our previous work, LAEB treatment successfully generated an amorphous layer on a cast polycrystalline Al-Co-Ce glass forming alloy. However, cracking was found and was associated with large and brittle Al 8 Co 2 Ce phase in the bulk material. Results show that prior LSM treatment in this present work can effectively refine the microstructure of as-cast material, decreasing the particle size and particle spacing of Al 8 Co 2 Ce phase. This decrease in the microstructural length scale greatly reduced the results of cracking of the amorphous layer. The LAEB pulse number required for the homogenisation and amorphisation of treated layer was also decreased for the laser pre-treated sample compared to as-cast material.

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Grain refinement, hardening and metastable phase formation by high current pulsed electron beam (HCPEB) treatment under heating and melting modes

Cited by 56 publications

References 33 publications

Halo Evolution of Hypereutectic Al‐17.5Si Alloy Treated with High‐Current Pulsed Electron Beam

Halo Evolution of Hypereutectic Al‐17.5Si Alloy Treated with High‐Current Pulsed Electron Beam

Surface Modification and Alloying of Aluminum and Titanium Alloys with Low-Energy, High-Current Electron Beams

Effect of prior laser microstructural refinement on the formation of amorphous layer in an Al86Co7.6Ce6.4 alloy

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