Determination of the thermodynamic potentials of metallic glasses and their relation to the defect structure

2021 ◽  
Author(s):  
Andrey Makarov ◽  
Gennadii V Afonin ◽  
Jichao Qiao ◽  
Alexander Glezer ◽  
Nikolai Kobelev ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Defect Structure ◽  
Thermodynamic Potentials

DETERMINATION OF THE LOCAL STRUCTURE OF METALLIC GLASSES BY EXAFS

1982 ◽  
Vol 43 (C9) ◽  
pp. C9-43-C9-46 ◽  
Author(s):  
A. Sadoc ◽  
A. M. Flank ◽  
D. Raoux ◽  
P. Lagarde
Keyword(s):  
Metallic Glasses ◽  
Local Structure

The Defect Structure of CdO

1987 ◽  
Vol 42 (6) ◽  
pp. 746-749 ◽  
Author(s):  
Jenő Juhász ◽  
Sarolta Igaz ◽  
Béla Jóvér ◽  
Zoltán G. Szabó
Keyword(s):  
Solid Solution ◽  
Chemical Analysis ◽  
Defect Structure ◽  
Direct Determination ◽  
Good Reproducibility ◽  
Heat Treated ◽  
Defect Sites

Abstract Defect Sites of CdO, Reducibility, Analysis Three procedures of chemical analysis are proposed for the direct determination of excess Cd in CdO: a spectrophotometric, a titrimetric and a gravimetric one, for 0-1500 ppm, 500-50,000 ppm and above 5%, respectively. The good reproducibility and reliability is illustrated by results referring to CdO samples heat-treated in H 2 and in air between 100 and 350 °C. Reduction in H2 increases the concentration of excess Cd up to 4000 ppm, above that separate Cd phase forms. The excess Cd in solid solution (interstitial sites) is more resistant against re-oxidation, than the bulk Cd phase.

scholarly journals Metallic Glasses: A New Approach to the Understanding of the Defect Structure and Physical Properties

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 605 ◽  
Author(s):  
Vitaly Khonik ◽  
Nikolai Kobelev
Keyword(s):  
Shear Modulus ◽  
Physical Properties ◽  
Experimental Verification ◽  
Metallic Glasses ◽  
Structural Relaxation ◽  
Defect Structure ◽  
Relaxation Phenomena ◽  
Volume Changes ◽  
New Approach ◽  
Heat Effects

The work is devoted to a brief overview of the Interstitialcy Theory (IT) as applied to different relaxation phenomena occurring in metallic glasses upon structural relaxation and crystallization. The basic hypotheses of the IT and their experimental verification are shortly considered. The main focus is given on the interpretation of recent experiments on the heat effects, volume changes and their link with the shear modulus relaxation. The issues related to the development of the IT and its relationship with other models on defects in metallic glasses are discussed.

NANOINDENTATION STUDIES OF METALLIC GLASSES AND NANOQUASICRYSTAL–GLASS COMPOSITES IN Zr–Al (Ga)–Cu–Ni ALLOYS

2011 ◽  
Vol 10 (04n05) ◽  
pp. 929-933 ◽  
Author(s):  
DEVINDER SINGH ◽  
T. P. YADAV ◽  
R. S. TIWARI ◽  
O. N. SRIVASTAVA ◽  
MANJEET SINGH ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Shear Bands ◽  
Glass Composites ◽  
Ni Alloys ◽  
Glassy Alloys ◽  
Reduced Modulus ◽  
Pile Up ◽  
Melt Spun Ribbons ◽  
Ga Substitution

In this presentation, we report the indentation behavior of Zr 69.5 Al 7.5−x Ga x Cu 12 Ni 11 (x = 0 and 1.5 at.%) metallic glasses as well as nanoquasicrystal–glass composites. The minor alloying addition in Zr -based glassy alloys greatly influences their mechanical properties. The nanoindentation tests were carried out to study the load (P) versus displacement (h) curves for the determination of reduced modulus as well as their hardness behavior. The formation of shear bands around the indentation periphery has been investigated. The evidence of the pile up was observed. The P − h curve for as-synthesized melt-spun ribbons displayed the presence of displacement burst, which are known as pop-ins. It has been concluded that Ga substitution leads to the improvement of the mechanical behavior of Zr–Al (Ga)–Cu–Ni alloys.

scholarly journals Corrosion of Biocompatible Mg66+xZn30-xCa4 (x=0.2) Bulk Metallic Glasses

2016 ◽  
Vol 61 (2) ◽  
pp. 807-810 ◽  
Author(s):  
R. Nowosielski ◽  
K. Cesarz-Andraczke ◽  
P. Sakiewicz ◽  
A. Maciej ◽  
A. Jakóbik-Kolon ◽  
...  
Keyword(s):  
Corrosion Rate ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
X Ray Diffraction ◽  
Electrochemical Tests ◽  
Simulated Environment ◽  
Corrosion Studies ◽  
Physiological Fluid

Abstract The aim of this paper was to investigate the corrosion resistance of Mg66Zn30Ca4 and Mg68Zn28Ca4 metallic glasses and evaluate the ability of this amorphous alloy use for medical applications as biodegradable medical implants. Taking into account the amount of Mg, Zn, Ca elements dissolved in multielectrolyte physiological fluid (MPF) from Mg66+xZn30-xCa4 (x=0.2) alloys the daily dose of evolved ions from alloys components was determined. Additional goal of the paper was determination of corrosion rate (Vcorr) and amount of hydrogen evolved from amorphous magnesium alloys in simulated environment of human body fluids during 24h immersion and during electrochemical tests. Corrosion studies were done in the multielectrolyte physiological fluid (MPF) at 37°C. The amount of hydrogen evolved [ml/cm2] and corrosion rate Vcorr [mm/year] of amorphous Mg66Zn30Ca4 and Mg68Zn28Ca4 alloys were compared. The work also presents characterization of Mg-based bulk metallic glasses structure in the form of 2 mm thickness plates. Samples structure was analyzed by means of X-ray diffraction. Fracture and surface morphology of magnesium alloy samples were identified using scanning electron microscopy.

Determination of the Free Energy of Metallic Glasses*

1988 ◽  
Vol 157 (Part_1) ◽  
pp. 29-34 ◽  
Author(s):  
R. Bormann ◽  
F. Gärtner ◽  
P. Haasen
Keyword(s):  
Free Energy ◽  
Metallic Glasses
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