The influence of periodical, interference laser micromachining on nano-crystallization of amorphous magnetic ribbons

The main problem connected with crystallization of amorphous magnetic materials from the FeSiB(X) group is the increase of their fragility with the increasing content of crystalline phase. To overcome this defect the possibilities offered by the interference, pulse laser heating of FeSiB ribbons were utilized. A simple, interference prismatic system at the output of Nd:YAG laser (8-10 ns, 2 J, 1064 nm) was used. The investigations included the influence of laser radiation energy density, number of laser pulses and their periodical, spatial surface arrangement on the crystallization process. Full Text: PDF ReferencesY.R. Zhang and R.V. Ramanujan, "A study of the crystallization behavior of an amorphous Fe77.5Si13.5B9 alloy", Mater. Sci. Eng. A 416, 161 (2006). CrossRef T. Alam, T. Borkar, S. Joshi, S. Katakamb, X. Chenc and N.B. Dahotre, "Influence of niobium on laser de-vitrification of Fe-Si-B based amorphous magnetic alloys", J. Non-Cryst. Solids 428, 75 (2015). CrossRef K.G. Pradeep, G. Herzer, P. Choi and D. Raabe, "Atom probe tomography study of ultrahigh nanocrystallization rates in FeSiNbBCu soft magnetic amorphous alloys on rapid annealing", Acta Mater. 68, 295 (2014). CrossRef S. Katakam, J.Y. Hwang, H. Vora, S.P. Harimkar, R. Banerjee and N.B. Dahotre, "Laser-induced thermal and spatial nanocrystallization of amorphous Fe-Si-B alloy", Scr. Mater. 66, 538 (2012). CrossRef J. Kusiński, A. Sypień, G. Kusiński and C. Nilson, "Microstructure and nanochemistry of Ca-doped cobalt oxide single crystals", Mat. Chem. Phys. 81, 390 (2003). CrossRef C. Smith, S. Katakam, S. Nag, X. Chen, R.V. Ramanujan, N.B. Dahotre and R. Banerjee, "Improved soft magnetic properties by laser de-vitrification of Fe-Si-B amorphous magnetic alloys", Mater. Lett. 122, 155 (2014). CrossRef Ch. Lu and R. H. Lipson, "Interference lithography: a powerful tool for fabricating periodic structures", Laser Photonics Rev. 4, 568 (2010). CrossRef K. Czyż, J. Marczak, R. Major, A. Mzyk, A. Rycyk, A. Sarzyński and M. Strzelec, "Selected laser methods for surface structuring of biocompatible diamond-like carbon layers", Diam. Relat. Mater. 67, 26 (2016). CrossRef A. Sarzyński, J. Marczak, M. Strzelec, A. Rycyk, K. Czyż and D. Chmielewska, "Laser micro-structuring of surfaces for applications in materials and biomedical science", Proc. SPIE, 10159, 101590A (2016). CrossRef

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Surface modification of WC—3% Co hard alloy by powerful nanosecond ultraviolet laser pulses

Deformation and Fracture of Materials ◽

10.31044/1814-4632-2020-11-11-14 ◽

2020 ◽

pp. 11-14

Author(s):

Yu. A. Zheleznov ◽

◽

T. V. Malinsky ◽

S. I. Mikolutskiy ◽

V. E. Rogalin ◽

...

Keyword(s):

Hard Alloy ◽

Radiation Energy ◽

Laser Pulses ◽

Incident Radiation ◽

Impact Zone ◽

Radiation Energy Density ◽

Ultraviolet Laser ◽

Focused Beams ◽

The Impact

The surface quality of the WC—3% Co hard alloy after modification by focused beams of an ultraviolet laser has been investigated. At radiation energy density E ≥ 1.6 J / cm2, traces of melting with a size of 1—3 μm were found on the alloy surface in the impact zone. An increase in intensity of the incident radiation to E ≈ 6.2 J / cm2 leads to an increase in the concentration of cobalt on the surface from 7 to 10%, while the concentration of carbon decreases from 33 to 18%.

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Partitioning Behavior of Al and Si in FINEMET Nanocrystalline Soft Magnetic Alloys, as Studied by Atom-Probe Tomography

Microscopy and Microanalysis ◽

10.1017/s1431927609095567 ◽

2009 ◽

Vol 15 (S2) ◽

pp. 266-267

Author(s):

K Knipling ◽

M Daniil ◽

M Willard

Keyword(s):

Atom Probe Tomography ◽

Atom Probe ◽

Soft Magnetic ◽

Magnetic Alloys ◽

Soft Magnetic Alloys ◽

Partitioning Behavior ◽

Nanocrystalline Soft Magnetic Alloys

Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009

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Спектральные характеристики свечения поверхности частиц каменных углей во время воздействия лазерных импульсов в режиме свободной генерации

Журнал технической физики ◽

10.21883/os.2020.12.50327.187-20 ◽

2020 ◽

Vol 128 (12) ◽

pp. 1898

Author(s):

Б.П. Адуев ◽

Д.Р. Нурмухаметов ◽

Я.В. Крафт ◽

З.P. Исмагилов

Keyword(s):

Energy Density ◽

Laser Pulse ◽

Pulse Energy ◽

Laser Pulse Energy ◽

Emission Spectra ◽

Radiation Energy ◽

Laser Pulses ◽

Radiation Energy Density ◽

Pulse Energy Density ◽

Coal Particles

In this work, we investigated the glow spectra of coal fractions with dimensions 63 μm directly during the action of neodymium laser pulses (120 μs). Depending on the radiation energy density H, the emission spectra have a different character. The glow at the minimum values of the laser pulse energy density Hcr (1) is associated with the ignition of small coal particles (~ 1 μm) present in the fractions and the ignition of reactive microprotrusions on the surface of the larger coal particles. The glow spectra at this stage are of a non-thermal nature and are associated with the emission of molecules of volatile substances in the gas phase and the products of their oxidation. With an increase in the laser pulse energy density H, a thermal glow of the surface of larger coal particles is observed, which is described by the Planck formula at T = 3100 K. When H = Hcr (2) is reached, the surface of the coal particles is ignited during the action of the laser pulse. Contributions to the spectra are the glow of the surface of coal particles, emitted carbon particles, and the glow associated with the emission of excited molecules H2, H2O, CO2. With an increase in H> Hcr (2), the processes leading to the glow of coal particles during a laser pulse are similar to those described above for Hcr (2), but the glow intensity increases

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MAGNIFER 8105, 8105 So

Alloy Digest ◽

10.31399/asm.ad.ni0575 ◽

2001 ◽

Vol 50 (11) ◽

Keyword(s):

Corrosion Resistance ◽

Physical Properties ◽

Tensile Properties ◽

Nickel Content ◽

Heat Treating ◽

Soft Magnetic ◽

Magnetic Alloys ◽

Soft Magnetic Alloys ◽

Recording Heads ◽

High Nickel

Abstract Magnifer 8105 and 8105 So are soft magnetic alloys with a high nickel content. Typical applications for 8105 are recording heads, while 8105 So has additional applications. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-575. Producer or source: Krupp VDM GmbH.

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HIPERCO 15

Alloy Digest ◽

10.31399/asm.ad.fe0124 ◽

2002 ◽

Vol 51 (10) ◽

Keyword(s):

Electrical Resistivity ◽

Cobalt Content ◽

Heat Treating ◽

High Saturation Magnetization ◽

Soft Magnetic ◽

Magnetic Alloys ◽

Soft Magnetic Alloys ◽

High Electrical Resistivity ◽

Technology Corporation ◽

Carpenter Technology Corporation

Abstract Hiperco Alloy 15 is a development in soft magnetic alloys that combines the properties of high saturation, magnetization, high electrical resistivity, and lower cobalt content. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on forming and heat treating. Filing Code: FE-124. Producer or source: Carpenter Technology Corporation.

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Formation of Periodical Sub-Micron Sized Structures on Silicon by Interfered Nanosecond Laser Pulses

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.97-101.3803 ◽

2010 ◽

Vol 97-101 ◽

pp. 3803-3806

Author(s):

Yong Xiang Hu ◽

Heng Zhang ◽

Zheng Qiang Yao

Keyword(s):

Cost Effective ◽

Laser Pulses ◽

Laser Beams ◽

Nanosecond Laser ◽

Effective Technique ◽

First Order ◽

Direct Fabrication ◽

Cost Effective Technique ◽

Nanosecond Laser Pulses ◽

Micro Structuring

Laser interference micro-structuring is a relatively efficient and cost-effective technique for fabricating periodical micro-nano-structuring surfaces. The direct fabrication of sub-micron sized dot array on silicon was performed by four interfering nanosecond laser beams with a diffractive beam splitter. The mechanism to form the dot array was analyzed and it was found that the obtained conical dot array had a negative shape of the interference pattern of four laser beams. A second-order peak between two first-order peaks also occurred due to the liquid-solid expansion.

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