Excess free volume in metallic glasses measured by X-ray diffraction

Yavari, A.R.; Moulec, A. Le; Inoue, Akihisa; Nishiyama, Nobuyuki; Lupu, N.; Matsubara, Eiichiro; Filho, Walter José Botta; Vaughan, Gavin; Michiel, Marco Di; Kvick, Å.

doi:10.1016/j.actamat.2004.12.011

Cited by 360 publications

(253 citation statements)

References 38 publications

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“…The atomic volume change computed using equation (3) is equivalent to the macroscopic volume change obtained by dilatometry [14,15]. Figure 4 shows the variation of Q max for a Fe 80 B 12 Nb 7 Cu 1 alloy; this slight variation can be well determined by fitting the very top of the peak to a parabolic function.…”

Section: Resultsmentioning

confidence: 99%

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Structural study of conventional and bulk metallic glasses during annealing

Pineda

Hidalgo

Bruna

et al. 2009

Journal of Alloys and Compounds

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Metallic glasses with conventional glass-forming ability (Al-Fe-Nd, Fe-Zr-B, Fe-B-Nb compositions) and bulk metallic glasses (Ca-Mg-Cu compositions) were studied by synchrotron X-ray diffraction during annealing throughout glass transition and crystallization temperatures.The analysis of the first diffraction peak position during the annealing process allowed us to follow the free volume change during relaxation and glass transition. The structure factor and the radial distribution function of the glasses were obtained from the X-ray measurements. The structural changes occurred during annealing are analyzed and discussed.

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Section: Resultsmentioning

confidence: 99%

“…In ref. [14], Yavari et al showed that the free volume content is homogeneously distributed in the atomic structure of metallic glasses.…”

Section: Resultsmentioning

confidence: 99%

Structural study of conventional and bulk metallic glasses during annealing

Pineda

Hidalgo

Bruna

et al. 2009

Journal of Alloys and Compounds

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“…As proposed by Yavari et al [7] the third power of the principal diffuse peak position Q scales with the coefficient of the volumetric thermal expansion˛t h of amorphous material as in…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore it was shown that the atomic volume change computed using Eq. (3) is equivalent to the macroscopic volume change obtained by dilatometry [7]. It should be noted here that for isotropic materials, the length thermal expansion coefficientˇt h is one third the volumetric coefficient˛t h , i.e.˛t h = 3ˇt h .…”

Section: Resultsmentioning

confidence: 99%

Thermal expansion of La-based BMG studied by in situ high-energy X-ray diffraction

Bednarčı́k

Curfs

Sikorski

et al. 2010

Journal of Alloys and Compounds

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a b s t r a c tThe present work focuses on the study of the thermal stability of La 62 Al 14 (Cu 5/6 Ag 1/6 ) 14 Ni 5 Co 5 (at.%) bulk metallic glass (BMG) using the state-of-the-art high temperature in situ hard X-ray scattering techniques available at the undulator beamline ID11 of ESRF (Grenoble, France). Constant-rate heating experiments using a fast X-ray camera (time resolution of 3 s) reveal detailed information about the thermal stability of the La-based BMG. Analyzing diffraction patterns in a reciprocal space yields thermal expansion of amorphous alloy providing insight about the thermally activated relaxation effects and glass transition. We found that in the region 20 K below the glass transition (T g = 420 K) thermal expansion curve exhibits negative slope which indicates annealing-out of the quenched-in free volumes. The glass transition appears as a brake in the value of coefficient of the volume thermal expansion˛t h . Furthermore, real space analysis based on reduced pair distribution function G(r) allows to trace the changes in the local atomic structure of amorphous material during constant-rate heating.

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“…В работе [18] было отмечено значительное умень-шение объема сплавов на основе Zr в указанном интервале температур. Как известно, есть некоторые пробелы в полу-чении четкого представления о природе явления стеклования, особенно для металлических жид-костей.…”

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Properties of Bulk Metallic Glasses

Luzgin¹,

Polkin²

2016

Izv.VUZ. Tsvet. Met.

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Металловедение и термическая обработка Izvestiya vuzov. Tsvetnaya metallurgiya • 6 • 2016 71 ВведениеМеталлические стекла, получаемые в виде тон-ких чешуек или лент, известны со второй полови-ны прошлого века [1]. Объемные металлические стекла (ОМС) с минимальным размером порядка 100-102 мм в каждом из 3 пространственных из-мерений [2] изначально были получены в системах Pd-Cu-Si и Pd-Ni-P, но ввиду исключительной дороговизны основного компонента (палладия) долгое время не представляли особого интере-са для ученых и инженеров. Впоследствии ОМС, полученные во многих других системах, включая технологически важные -на основе Fe, Mg, Ti и За последние несколько десятилетий открыто относительно небольшое число революционных материалов в области ме-талловедения и физики металлов, и объемные металлические стекла одни из них. Их прочность и твердость значительно выше, а модуль упругости ниже, чем кристаллических сплавов, что приводит к высокой энергии запасенной упругой деформации. Эти материалы также имеют очень хорошую устойчивость к коррозии. В настоящей работе исследованы свойства объемных металлических стекол, в частности тепловые, механические, магнитные, электрические показатели и коррозионная стойкость, а также приводятся области применения данных сплавов. Louzguine-Luzgin D.V., Pol'kin V.I. Properties of bulk metallic glassesA relatively small number of revolutionary discoveries were made in the field of metallurgy and metal physics in the last few decades, and bulk metallic glasses are one of them. The strength and hardness of bulk metallic glasses are much higher while moduli of elasticity are lower than those of crystalline alloys which results in high stored elastic strain energy. These alloys also have very good corrosion resistance. This article covers various properties of bulk metallic glasses, in particular thermal, mechanical, magnetic, electrical properties and corrosion resistance as well as applications of these alloys.Keywords: bulk metallic glasses, strength, ductility, application.

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Excess free volume in metallic glasses measured by X-ray diffraction

Cited by 360 publications

References 38 publications

Structural study of conventional and bulk metallic glasses during annealing

Structural study of conventional and bulk metallic glasses during annealing

Thermal expansion of La-based BMG studied by in situ high-energy X-ray diffraction

Properties of Bulk Metallic Glasses

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