Structural modifications of swift-ion-bombarded metallic glasses studied by high-energy X-ray synchrotron radiation

Michalik, Š.; Michaliková, Jana; Pavlovič, Márius; Sovák, P.; Liermann, Hanns‐Peter; Miglierini, Marcel

doi:10.1016/j.actamat.2014.07.072

Cited by 38 publications

(18 citation statements)

References 34 publications

(47 reference statements)

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“…The first group of materials could be so-called metallic glasses, especially the softmagnetic metallic alloys. They also feature similar chemical composition [15,16] and the ion-range data are needed for radiation hardness studies of these materials against ion irradiation [17][18][19][20][21]. The second possible candidates could be steels; a large family of materials made of the same iron bulk material with different additive elements and processed by different technological treatments.…”

Section: Discussionmentioning

confidence: 99%

Ranges of protons in biological targets

Pavlovič

Hammerle

2017

Journal of Electrical Engineering

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The paper introduces a simple fitting function for quick assessment of proton ranges in biological targets and human tissues. The function has been found by fitting an extensive data set of Monte Carlo proton ranges obtained with the aid of the SRIM-2013 code. The data has been collected for 28 different targets at 8 energies in the interval from 60 MeV to 220 MeV. The paper shows that at a given kinetic proton-beam energy, the Monte Carlo ranges can be satisfactorily fitted by a power function that depends solely on the target density. This is a great advantage for targets, for which the exact chemical composition is not known, or the mean ionizing potential is not reliably known. The satisfactory fit is meant as the fit that stays within the natural range straggling of the Monte Carlo ranges. In the second step, the energy-scaling yielding a universal fitting formula for proton ranges as a function of proton-beam energy and target density is introduced and discussed. This paper is an extended version of the contribution presented at the APCOM2017 conference.K e y w o r d s: biological targets, proton range, proton therapy, range straggling, SRIM

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Section: Discussionmentioning

confidence: 99%

Ranges of protons in biological targets

Pavlovič

Hammerle

2017

Journal of Electrical Engineering

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“…Using HEXRD, modifications of structural arrangements including relaxation processes were investigated in Fe 73 Cu 1 Nb 3 Si 16 B 7 MG bombarded by swift heavy ions . In another studies, pronounced changes in magnetic hyperfine interactions were derived from Mössbauer spectra of amorphous alloys that were also irradiated with swift heavy ions .…”

Section: Introductionmentioning

confidence: 99%

Ion irradiation induced structural modifications of Fe₈₁Mo₈Cu₁B₁₀ NANOPERM‐type alloy

Miglierini

Hasiak

2015

Physica Status Solidi (a)

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Structural modifications and their impact upon magnetic properties are studied in amorphous NANOPERM‐type 57Fe81Mo10Cu1B10 metallic glass exposed to irradiation with 130 keV N+ ions to the total fluencies of up to 2.5 × 1017 ions/cm2. Using surface sensitive technique of Mössbauer spectrometry, traces of crystalline phases are found already in the as‐quenched state after the sample production. On the air side of the ribbons, bcc‐Fe dominates whereas on the opposite wheel side, also a presence of Fe3O4 is unveiled. The amount of surface crystallization is higher on the wheel side of the ribbons. After ion irradiation, mostly the air side is affected because it was facing the incident ions. Gradual formation of iron nitrides is observed with increasing ion fluence. Though the radiation damage exhibits itself only at this side of the ribbons, its influence upon bulk magnetic properties is clearly identified by the help of magnetic measurements. Hysteresis loops exhibit changes in their shape as well as coercive field. Along with the formation of magnetic crystalline phases (bcc‐Fe and nitrides), they are caused by structural rearrangement which takes place also inside the amorphous residual phase. Structural modifications are confirmed via evolution of hyperfine magnetic fields with ion fluence. Structural modification of the 57Fe81Mo10Cu1B10 alloy caused by ion irradiation as demonstrated by microstructural (Mössbauer spectrometry (a,b)) and macroscopic (hysteresis loops (c,d)) measurements. As‐quenched (a,c) and 2.5 × 1017 N+/cm2 irradiated (b,d) alloys are compared.

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“…It was also engaged to measure plastic deformation mechanisms in MGs [21]. Recently, we have used in situ HEXRD (energy ~60 keV) for the study of structural arrangements and relaxation processes induced in FINEMET-type MGs by swift heavy-ion bombardment [22]. Kinetics of crystallization was reported earlier in similar alloys using low energy (~7 keV) in situ DSR [23].…”

Section: Introductionmentioning

confidence: 99%

Evolution of structure and local magnetic fields during crystallization of HITPERM glassy alloys studied by in situ diffraction and nuclear forward scattering of synchrotron radiation

Miglierini

Pavlovič

Procházka

et al. 2015

Phys. Chem. Chem. Phys.

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Evolution of structure and local magnetic fields in (Fe1-xCox)76Mo8Cu1B15 (HITPERM) metallic glass ribbons with various amounts of Co (x = 0, 0.25, 0.5) were studied in situ using diffraction and nuclear forward scattering of synchrotron radiation. It was found that crystallization for all three glasses proceeds in two stages. In the first stage, bcc (Fe,Co) nanocrystals are formed, while in the second stage additional crystalline phases evolve. For all three glasses, the crystallization temperatures at the wheel side were found to be lower than at the air side of the ribbon. The crystallization temperatures were found to decrease with increasing Co content. The lattice parameters of the bcc nanocrystals decrease up to about 550 °C and then increase pointing to squeezing Mo atoms out of the nanograins or to interface effects between the nanocrystals and the glassy matrix. Nuclear forward scattering enabled separate evaluation of the contributions that stem from structurally different regions within the investigated samples including the newly formed nanocrystals and the residual amorphous matrix. Even minor Co content (x = 0.25) has a substantial effect not only upon the magnetic behaviour of the alloy but also upon its structure. Making use of hyperfine magnetic fields, it was possible to unveil structurally diverse positions of Fe atoms that reside in a nanocrystalline lattice with different number of Co nearest neighbours.

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Structural modifications of swift-ion-bombarded metallic glasses studied by high-energy X-ray synchrotron radiation

Cited by 38 publications

References 34 publications

Ranges of protons in biological targets

Ranges of protons in biological targets

Ion irradiation induced structural modifications of Fe₈₁Mo₈Cu₁B₁₀ NANOPERM‐type alloy

Evolution of structure and local magnetic fields during crystallization of HITPERM glassy alloys studied by in situ diffraction and nuclear forward scattering of synchrotron radiation

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Structural modifications of swift-ion-bombarded metallic glasses studied by high-energy X-ray synchrotron radiation

Cited by 38 publications

References 34 publications

Ranges of protons in biological targets

Ranges of protons in biological targets

Ion irradiation induced structural modifications of Fe81Mo8Cu1B10 NANOPERM‐type alloy

Evolution of structure and local magnetic fields during crystallization of HITPERM glassy alloys studied by in situ diffraction and nuclear forward scattering of synchrotron radiation

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Ion irradiation induced structural modifications of Fe₈₁Mo₈Cu₁B₁₀ NANOPERM‐type alloy