X-Ray Study of Pd40Cu30Ni10P20 Bulk Metallic Glass Brazing Filler for Ti-6Al-7Nb Alloy

The oxidation kinetics of Cu60Zr30Ti10 bulk metallic glass and its crystalline counterpart were studied in oxygen environment over the temperature range of 573–773 K. The oxidation kinetics, measured with thermogravimetric analysis, of the metallic glass follows a linear rate law between 573 and 653 K and a parabolic rate law between 673 and 733 K. It was also found that the oxidation activation energy of metallic glass is lower than that of its crystalline counterpart. The x-ray diffraction pattern showed that the oxide layer is composed of Cu2O, CuO, ZrO2, and metallic Cu. Cu enrichment on the topmost oxide layer of the metallic glass oxidized at 573 K was revealed by x-ray photoelectron spectroscopy while there was a decrease in Cu content in the innermost oxide layer. The oxide surface morphologies observed from scanning electron microscopy showed that ZrO2 granules formed at low temperatures while whiskerlike copper oxides formed at higher temperatures.

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Crystallization of Cu60Zr20Ti20 bulk metallic glass by high pressure torsion

REVIEWS ON ADVANCED MATERIALS SCIENCE ◽

10.1515/rams-2019-0037 ◽

2019 ◽

Vol 58 (1) ◽

pp. 304-312

Author(s):

Ádám Révész ◽

András Horváth ◽

Gábor Ribárik ◽

Erhard Schafler ◽

David J. Browne ◽

...

Keyword(s):

High Pressure ◽

Metallic Glass ◽

Crystallite Size ◽

Bulk Metallic Glass ◽

High Pressure Torsion ◽

Average Crystallite Size ◽

Scanning Calorimetry ◽

X Ray ◽

Microstructural Parameters ◽

Profile Fitting

Abstract Bulk metallic glass of Cu60Zr20Ti20 composition has been synthesized by copper mold casting. Slices of the as-cast glass has been subjected to severe plastic deformation by high-pressure torsion for different whole turns. The microstructure and the thermal behavior of the deformed disks have been investigated by X-ray diffraction and differential scanning calorimetry. It was confirmed that the initial compression preceding the high pressure torsion induces crystallized structure, which shows only minor further changes upon the severe plastic shear deformation achieved by twisting the sample. The X-ray line profiles have been evaluated by the Convolutional Whole Profile Fitting algorithm in order to determine the evolution of the microstructural parameters, such as the median and variance of the crystallite size distribution, average crystallite size and dislocation density as a function of the number of revolutions. Hardness measurements by nanoindentation have also been carried out on the as-cast alloys and the deformed disks.

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In situ X-ray diffraction investigation of compression behavior in Gd 40 Y 16 Al 24 Co 20 bulk metallic glass under high pressure with synchrotron radiation

Chinese Physics C ◽

10.1088/1674-1137/33/11/020 ◽

2009 ◽

Vol 33 (11) ◽

pp. 1028-1032 ◽

Cited By ~ 2

Author(s):

Xu Tao ◽

Huang Lei ◽

Dong Yan-Guo ◽

Li Gong ◽

Li Yan-Chun ◽

...

Keyword(s):

High Pressure ◽

Synchrotron Radiation ◽

Metallic Glass ◽

Bulk Metallic Glass ◽

X Ray Diffraction ◽

Compression Behavior ◽

X Ray

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Influence of annealing on structural relaxation, crystallization, and deformation behavior of a Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass

Journal of Materials Research ◽

10.1557/jmr.2007.0253 ◽

2007 ◽

Vol 22 (7) ◽

pp. 1849-1858 ◽

Cited By ~ 3

Author(s):

Kwang Seok Lee ◽

Jürgen Eckert ◽

Hyun-Joon Jun ◽

Young Won Chang

Keyword(s):

Mechanical Properties ◽

Metallic Glass ◽

Bulk Metallic Glass ◽

Deformation Behavior ◽

Structural Changes ◽

Supercooled Liquid ◽

Supercooled Liquid Region ◽

Liquid Region ◽

Compression Tests ◽

X Ray

The influence of annealing on the structural changes and the mechanical properties of Zr41.2Ti13.8Cu12.5Ni10Be22.5 (Vit-1) bulk metallic glass was systematically studied by varying the annealing times at 703 K. The evolution of the structural state at a relatively high temperature within the supercooled liquid region was studied by thermal analysis, x-ray diffraction, high-resolution transmission electron microscopy, extended x-ray absorption fine structure, and dilatometric measurements. The deformation behavior and the mechanical properties were also examined by carrying out hardness and compression tests for the specimens annealed for various times.

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Thermal expansion of a La-based bulk metallic glass: insight fromin situhigh-energy x-ray diffraction

Journal of Physics Condensed Matter ◽

10.1088/0953-8984/23/25/254204 ◽

2011 ◽

Vol 23 (25) ◽

pp. 254204 ◽

Cited By ~ 24

Author(s):

J Bednarcik ◽

S Michalik ◽

M Sikorski ◽

C Curfs ◽

X D Wang ◽

...

Keyword(s):

Thermal Expansion ◽

Metallic Glass ◽

Bulk Metallic Glass ◽

X Ray Diffraction ◽

X Ray

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X-Ray Study of Pd40Cu30Ni10P20 Bulk Metallic Glass Brazing Filler for Ti-6Al-7Nb Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.539-543.1983 ◽

2007 ◽

Vol 539-543 ◽

pp. 1983-1987 ◽

Cited By ~ 1

Author(s):

E. Miura ◽

Gene E. Ice ◽

E.D. Specht ◽

J.W.L. Pang ◽

Hidemi Kato ◽

...

Keyword(s):

Metallic Glass ◽

Bulk Metallic Glass ◽

Depth Profiling ◽

Fluorescence Analysis ◽

Small Sample ◽

Second Phase ◽

X Ray ◽

Fluorescence Measurements ◽

Mechanical Bond ◽

Grain Distribution

Crystalline precipitates in a bulk-metallic-glass (BMG) braze were investigated with an intense x-ray microbeam. The precipitates were found in the Pd40Cu30P20Ni10 BMG braze matrix after joining crystalline Ti-6Al-7Nb. However, the role (if any) played by the precipitates in improving the mechanical bond of the BMG/crystalline joint is unknown. X-ray microdiffraction and microfluorescence measurements from small sample volumes were made with an ~ 0.5 x 0.5 μm2 beam. Spatially-resolved Laue diffraction and x-ray fluorescence measurements were made on several second-phase crystals within the BMG matrix. Although precipitate crystals with the observed compositions were anticipated to be predominantly hexagonal, one of the crystals was found to be cubic or tetragonal. The instrumentation includes capabilities for 3D depth-resolved measurements of crystal structure and for fluorescence analysis of elemental composition. Depth profiling gave information about the grain distribution and morphology in the BMG matrix.

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In situ high-energy x-ray diffraction observation of structural evolution in a Ti-based bulk metallic glass upon heating

Journal of Materials Research ◽

10.1557/jmr.2010.0298 ◽

2010 ◽

Vol 25 (12) ◽

pp. 2271-2277 ◽

Cited By ~ 11

Author(s):

N. Zheng ◽

G. Wang ◽

L.C. Zhang ◽

M. Calin ◽

M. Stoica ◽

...

Keyword(s):

Metallic Glass ◽

Bulk Metallic Glass ◽

Free Volume ◽

Structural Relaxation ◽

Structural Evolution ◽

High Energy ◽

Rapid Quenching ◽

X Ray Diffraction ◽

X Ray

The structural evolution of the Ti40Zr10Cu34Pd14Sn2 bulk metallic glass (BMG) upon was investigated by means of in situ high-energy x-ray diffraction. The position, width, and intensity of the first peak in diffraction patterns are fitted through Voigt function below 800 K. All the peak position, width, and intensity values show a nearly linear increase with the increasing temperature to the onset temperature of structural relaxation, Tr = 510 K. However, these values start to deviate from the linear behavior between Tr and Tg (the glass transition temperature). The changes in free volume and the coefficient of volume thermal expansion prove that the aforementioned phenomenon is closely related to the structural relaxation releasing excess free volume arrested during rapid quenching of the BMG. Above 800 K, three crystallization events are detected and the first exothermic event is due to the formation of metastable nanocrystals.

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