Laser Surface Modification of a Crystalline Al‐Co‐Ce Alloy for Enhanced Corrosion Resistance

Hoekstra, J. G.; Qadri, S. B.; Scully, John R.; Fitzgerald, James W.

doi:10.1002/adem.200500103

Cited by 31 publications

(14 citation statements)

References 16 publications

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“…However, the thermal stresses generated by laser treatment, combined with the highly brittle nature of the glass forming alloy resulted in cracking of the laser treated area. The generation of cracking is a frequent result of laser surface treatment [9]. There was concern that the heating cycles due to successive tracks could induce recrystallisation of neighbouring laser amorphised regions, laser treatment was therefore restricted to single tracks.…”

Section: Microstructurementioning

confidence: 99%

“…Laser treatment can result in crack formation as well as incomplete amorphisation [9,11]. An HVOF sprayed coating can be significantly different to the bulk material of the same composition as the spraying process can introduce porosity, oxides, regions of unmelted and resolidified material and a lamellar microstructure as well as producing the amorphous phase [18,19].…”

Section: Introductionmentioning

confidence: 99%

“…Hoekstra et al [9] used excimer laser surface treatment to produce an amorphous-like surface on Al 94 Co 7.5 Ce 8.5 , Audebert et al [10] have generated amorphous phases in Zr-and Mg-based alloys, Carvalho et al [11] used a two step laser process to generate an essentially amorphous coating of Zr 60 A1 15 Ni 25 . It should be noted that the surfaces produced are usually referred to as largely or essentially amorphous, with some fraction of crystalline material present.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion behaviour of crystalline and amorphous forms of the glass forming alloy Fe43Cr16Mo16C15B10

Bakare

Voisey

Chokethawai

et al. 2012

Journal of Alloys and Compounds

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The corrosion behaviour of both crystalline and largely amorphous forms of the Fe-based glass forming alloy, Fe 43 Cr 16 Mo 16 C 15 B 10 alloy was investigated. Two different methods were used to induce transformation to the amorphous form of the alloy: laser melting and HVOF spraying. Both methods produced largely amorphous material, however the high brittleness of the alloy makes it susceptible to cracking during laser treatment, hence this technique is not suitable for largescale application. Potentiodynamic scanning showed that in 0.5M H 2 SO 4 and 3.5% NaCl electrolytes both amorphous forms of the alloy had better corrosion resistance (lower current densities for -200 to +1000mV SCE) compared to the crystalline material. The laser treated material and HVOF coating performed similarly in 3.5% NaCl. In 0.5M H 2 SO 4 the HVOF coating had a lower current density than the laser melted material for almost all of the potential range -300 to +1000mV SCE. The improved corrosion behaviour of the largely amorphous material is attributed to its homogeneity, and particularly to the elimination of the Mo-rich phase that underwent preferential corrosion in the crystalline form of the material.

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Section: Microstructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corrosion behaviour of crystalline and amorphous forms of the glass forming alloy Fe43Cr16Mo16C15B10

Bakare

Voisey

Chokethawai

et al. 2012

Journal of Alloys and Compounds

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“…The ternary Al-TM-RE (TM = transition metal, RE = rare earth) amorphous alloys are among the most important systems of this type because of their unique mechanical properties and capability of the nanocrystallization during thermal annealing [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Crystallization kinetics of Al86Ni8Gd6 amorphous alloy

Kulikova

Быков

Belozerova

et al. 2013

Journal of Non-Crystalline Solids

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We study structure and crystallization kinetics of melt-spun Al 86 Ni 8 Gd 6 amorphous alloy. The X-ray diffraction and transmission electron microscopy detect pronounced nanoscale clusters in the structure of the amorphous state. Differential scanning calorimetry analysis shows complex three-stage crystallization of the amorphous alloy at different heating rates. The high temperature X-ray diffraction analysis reveals crystallization mechanism with competing reactions of intermetallic compounds formation. Summarizing the experimental data, we introduce multiversion non-linear kinetic model that describes the crystallization process completely and allows us to determine kinetic parameters with high accuracy. The activation energies obtained reveal relatively stable amorphous state.

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“…Zr, Mg, Fe and Al [11] based amorphous alloys have all been generated through laser surface scanning treatment on bulk materials, while Fe [12,13], and Al [14] based amorphous alloys also have been produced by a pulsed laser process. A high-energy (0.5-1.5 MeV) scanning electron beam irradiation process has also been used to generate the amorphous phase in Zr and Cu [15] based bulk alloy.…”

mentioning

confidence: 99%

Amorphous layer formation in Al86.0Co7.6Ce6.4 glass-forming alloy by large-area electron beam irradiation

Murray

Voisey

et al. 2013

Applied Surface Science

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Amorphous Al-Co-Ce alloys are of interest because of their resistance to corrosion, but high cooling rates are generally required to suppress the formation of crystalline phases. In this study, the surface of a bulk crystalline Al-Co-Ce alloy of a glass-forming composition was treated using large area electron beam (LAEB) irradiation. Scanning electron microscopy shows that, compared to the microstructure of the original crystalline material, the treated surface exhibits greatly improved microstructural and compositional uniformity. Glancing angle X-ray diffraction conducted on the surface of treated samples indicates the formation of the amorphous phase following 25 and 50 pulses at 35 kV cathode voltage. However, when the samples are treated with 100 and 150 pulses at 35 kV cathode voltage of electron beam irradiation, the treated layer comprises localised crystalline regions in an amorphous matrix.In addition, the formation of cracks in the treated layer is found to be localised around the Al 8 Co 2 Ce phase in the bulk material. Overall, crack length per unit area had no clear change with an increase in the number of pulses.

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Laser Surface Modification of a Crystalline Al‐Co‐Ce Alloy for Enhanced Corrosion Resistance

Cited by 31 publications

References 16 publications

Corrosion behaviour of crystalline and amorphous forms of the glass forming alloy Fe43Cr16Mo16C15B10

Corrosion behaviour of crystalline and amorphous forms of the glass forming alloy Fe43Cr16Mo16C15B10

Crystallization kinetics of Al86Ni8Gd6 amorphous alloy

Amorphous layer formation in Al86.0Co7.6Ce6.4 glass-forming alloy by large-area electron beam irradiation

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