Structural relaxation in amorphous Fe40Ni40P14 B6 studied by energy dispersive X-ray diffraction

Egami, T.

doi:10.1007/bf02402745

Cited by 306 publications

(54 citation statements)

References 34 publications

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“…The volume is reduced by structural relaxation, and is usually explained by removal of excess free-volume which was quenched-in during fast cooling. However, the amount of reduction in volume is small, just a fraction of a percent [3,61], whereas the actual structural change observed by the change in the PDF is more extensive, and amounts to a few percent [65]. A better explanation is that as…”

Section: Effect Of Structural Relaxationmentioning

confidence: 99%

Mechanical Properties of Metallic Glasses

Egami

Iwashita

Dmowski

2013

Metals

132

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Metallic glasses are known for their outstanding mechanical strength. However, the microscopic mechanism of failure in metallic glasses is not well-understood. In this article we discuss elastic, anelastic and plastic behaviors of metallic glasses from the atomistic point of view, based upon recent results by simulations and experiments. Strong structural disorder affects all properties of metallic glasses, but the effects are more profound and intricate for the mechanical properties. In particular we suggest that mechanical failure is an intrinsic behavior of metallic glasses, a consequence of stress-induced glass transition, unlike crystalline solids which fail through the motion of extrinsic lattice defects such as dislocations.

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Section: Effect Of Structural Relaxationmentioning

confidence: 99%

Mechanical Properties of Metallic Glasses

Egami

Iwashita

Dmowski

2013

Metals

132

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“…23) Changes in PL has also been measured for several glass forming systems, including Pd 77 Cu 6 Si 17 24) and Ni 81 P 19 . 25) Unlike our present investigation, these measurements were carried out for isochronally annealed specimens at different temperatures.…”

Section: Relaxation Behaviormentioning

confidence: 99%

Relaxation and Crystallization Behavior of the Zr50Cu40Al10 Metallic Glass

et al. 2005

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We examined relaxation and crystallization behavior of the ternary Zr 50 Cu 40 Al 10 metallic glass by using positron annihilation and transmission electron microscopy (TEM). Observed changes in positron annihilation lifetime of the alloy annealed isothermally at 673 K, which is below the glass transition temperature, correlate well with observed density changes; while coincidence Doppler broadening (CDB) spectra exhibit no significant change. These observations demonstrate that free volume decreases without a rearrangement of atoms during structural relaxation. On the other hand, CDB spectrum has exhibited considerable changes when the same alloy was annealed at 773 K. TEM observations suggested that crystallization occurs via growth of spherulites of several hundred nm in diameter, which themselves are composed of radially grown grains. Chemical analysis revealed that Cu atoms are partitioned out during the growth of the spherulites. Diffraction study indicated that the unit cell of the crystalline phase belong to an orthorhombic system with a ¼ 0:892, b ¼ 0:550, and c ¼ 1:060 nm; while remaining interspherulite regions are found to crystallize into an fcc phase with a ¼ 1:28 nm, which is probably isostructural to the 3 phase.

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“…While this cannot be obtained from standard laboratory diffraction instruments, it is possible to determine accurate and precise pair distribution functions using data from modern high-energy highintensity synchrotron diffractometers and particularly from neutron spallation sources and time-of-flight detection (for example, see Carpenter & Yelon, 1986). Customized laboratory instrumentation using a tungsten Bremsstrahlung source and energy-dispersive detection has also been used with success for PDF analysis (Egami, 1978).…”

Section: Introductionmentioning

confidence: 99%

Accuracy of pair distribution function analysis applied to crystalline and non-crystalline materials

Toby¹,

Egami²

1992

Acta Crystallogr A Found Crystallogr

Self Cite

304

217

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Pair distribution function (PDF) analysis of neutron or X-ray powder diffraction data is a useful technique for analysis of short-range structure in both amorphous and crystalline materials. Errors in PDF determinations may arise from several sources: termination of the Fourier transform, lack of instrument resolution, counting statistics and inaccurate corrections for experimental artifacts. Estimates of the amount of error from termination and instrument resolution are computed using a model structure. A general method for estimating the expected contribution of statistical error to the PDF is introduced for the first time. The effect of termination varies with the type of material and with the amplitude of lattice vibrations but, in general, termination with Q > 30 produces minimal errors. Broadening of the diffraction pattern produces negligible effect for conventional instrumentation. With moderate data-collection times, the statistical errors can be reduced to reasonable levels. Pulsed-neutron diffraction can provide accurate and precise PDF measurements, as is demonstrated in this work by the agreement between model and experimental results for polycrystalline aluminium.

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Structural relaxation in amorphous Fe40Ni40P14 B6 studied by energy dispersive X-ray diffraction

Cited by 306 publications

References 34 publications

Mechanical Properties of Metallic Glasses

Mechanical Properties of Metallic Glasses

Relaxation and Crystallization Behavior of the Zr<SUB>50</SUB>Cu<SUB>40</SUB>Al<SUB>10</SUB> Metallic Glass

Accuracy of pair distribution function analysis applied to crystalline and non-crystalline materials

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