Resistometric study of short range ordering in metallic glasses having different free volume content

1984 ◽  
Vol 61-62 ◽  
pp. 1365-1370 ◽  
Author(s):  
Giuseppe Riontino ◽  
Paolo Allia ◽  
Franco Vinai
Keyword(s):  
Free Volume ◽  
Metallic Glasses ◽  
Volume Content ◽  
Short Range ◽  
Short Range Ordering

scholarly journals Effect of the Free Volume on the Electronic Structure of Cu70Zr30 Metallic Glasses

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4911
Author(s):  
Simon Evertz ◽  
Jochen M. Schneider
Keyword(s):  
Electronic Structure ◽  
Bond Strength ◽  
Coordination Number ◽  
Free Volume ◽  
Metallic Glasses ◽  
Volume Content ◽  
Short Distance ◽  
Volume Fraction ◽  
Plastic Behavior ◽  
Local Bonding

While it is accepted that the plastic behavior of metallic glasses is affected by their free volume content, the effect on chemical bonding has not been investigated systematically. According to electronic structure analysis, the overall bond strength is not significantly affected by the free volume content. However, with an increasing free volume content, the average coordination number decreases. Furthermore, the volume fraction of regions containing atoms with a lower coordination number increases. As the local bonding character changes from bonding to anti-bonding with a decreasing coordination number, bonding is weakened in the volume fraction of a lower coordination number. During deformation, the number of strong, short-distance bonds decreases more for free volume-containing samples than for samples without free volume, resulting in additional bond weakening. Therefore, we show that the introduction of free volume causes the formation of volume fractions of a lower coordination number, resulting in weaker bonding, and propose that this is the electronic structure origin of the enhanced plastic behavior reported for glasses containing free volume.

Relation between icosahedral short-range ordering and plastic deformation in Zr–Nb–Cu–Ni–Al bulk metallic glasses

2011 ◽  
Vol 59 (7) ◽  
pp. 2814-2822 ◽  
Author(s):  
Z.W. Zhu ◽  
L. Gu ◽  
G.Q. Xie ◽  
W. Zhang ◽  
A. Inoue ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Metallic Glasses ◽  
Short Range ◽  
Bulk Metallic Glasses ◽  
Short Range Ordering

Structural Aspects of Metallic Glasses

MRS Bulletin ◽  
2007 ◽  
Vol 32 (8) ◽  
pp. 629-634 ◽  
Author(s):  
Daniel B. Miracle ◽  
Takeshi Egami ◽  
Katharine M. Flores ◽  
Kenneth F. Kelton
Keyword(s):  
Free Volume ◽  
Metallic Glasses ◽  
Short Range ◽  
Short Range Order ◽  
Structural Model ◽  
Experimental Studies ◽  
Range Order ◽  
Medium Range Order ◽  
Packing Model ◽  
Medium Range

AbstractA recent structural model reconciles apparently conflicting features of randomness, short-range order, and medium-range order that coexist in metallic glasses. In this efficient cluster packing model, short-range order can be described by efficiently packed solute-centered clusters, producing more than a dozen established atomic clusters, including icosahedra. The observed preference for icosahedral short-range order in metallic glasses is consistent with the theme of efficient atomic packing and is further favored by solvent-centered clusters. Driven by solute—solute avoidance, medium-range order results from the organization in space of overlapping, percolating (via connected pathways), quasi-equivalent clusters. Cubic-like and icosahedral-like organization of these clusters are consistent with measured medium-range order. New techniques such as fluctuation electron microscopy now provide more detailed experimental studies of medium-range order for comparison with model predictions. Microscopic free volume in the efficient cluster packing model is able to represent experimental and computational results, showing free volume complexes ranging from subatomic to atomic-level sizes. Free volume connects static structural models to dynamic processes such as diffusion and deformation. New approaches dealing with “free” and “anti-free” microscopic volume and coordinated atomic motion show promise for modeling the complex dynamics of structural relaxations such as the glass transition. Future work unifying static and dynamic structural views is suggested.

Effect of free volume on the kinetics of chemical short range ordering in amorphous Fe40Ni40B20

1990 ◽  
Vol 117-118 ◽  
pp. 601-604 ◽  
Author(s):  
G.W. Koebrugge ◽  
J. van der Stel ◽  
J. Sietsma ◽  
A. van den Beukel
Keyword(s):  
Free Volume ◽  
Short Range ◽  
Short Range Ordering ◽  
Amorphous Fe40ni40b20 ◽  
Kinetics Of
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