Nanometer-scale Structural Relaxation in Zr-based Bulk Metallic Glass

2007 ◽  
Vol 1048 ◽  
Author(s):  
Jinwoo Hwang ◽  
Hongbo Cao ◽  
Paul M. Voyles
Keyword(s):  
Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Range Order ◽  
Nanometer Scale ◽  
Length Scale ◽  
Scanning Calorimetry ◽  
Medium Range Order ◽  
Medium Range

AbstractWe investigated the influence of annealing on the nanometer-scale medium-range order in Zr54Cu38Al8 bulk metallic glass using fluctuation electron microscopy. Fluctuation microscopy experiments probing structure at a length scale of 1 nm show that the as-cast Zr bulk metallic glass contains significant medium range order. That structure is unchanged by annealing at 87% of the glass transition temperature for 24 hours, although that anneal does significantly change the differential scanning calorimetry trace.

Medium-range Order of Zr54Cu38Al8 Bulk Metallic Glass

2014 ◽  
Vol 1649 ◽  
Author(s):  
Pei Zhang ◽  
M. F. Besser ◽  
M. J. Kramer ◽  
P. M. Voyles
Keyword(s):  
Electron Microscopy ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Glass Forming Ability ◽  
Range Order ◽  
Thermally Stable ◽  
Cast State ◽  
Medium Range Order ◽  
Glass Forming ◽  
Medium Range

ABSTRACTWe have previously reported, based on fluctuation electron microscopy (FEM) data, that Zr50Cu45Al5 bulk metallic glass (BMG) contains significant icosahedral and crystal-like medium-range order. Here, we report similar finding for Zr54Cu38Al8 BMG, which is a poorer glass former. Like Zr50Cu45Al5, Zr54Cu38Al8 contains icosahedral and crystal-like structures. In the as-cast state, the crystal-like peak in the FEM data is stronger than icosahedral-like peak. After annealing at 0.83Tg (573 K), the icosahedral-like peak increases, but, unlike Zr50Cu45Al5, the crystal-like peak does not decrease. This tendency toward stronger, more thermally stable crystal-like order may be associated with the poorer glass forming ability of Zr54Cu38Al8.

Quenched-in quasicrystal medium-range order and pair distribution function study on Zr55Cu35Al10 bulk metallic glass

2006 ◽  
Vol 14 (8-9) ◽  
pp. 888-892 ◽  
Author(s):  
Cang Fan ◽  
T.W. Wilson ◽  
W. Dmowski ◽  
H. Choo ◽  
J.W. Richardson ◽  
...  
Keyword(s):  
Distribution Function ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Pair Distribution Function ◽  
Range Order ◽  
Medium Range Order ◽  
Function Study ◽  
Medium Range

scholarly journals Influence of the Ag concentration on the medium-range order in a CuZrAlAg bulk metallic glass

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
C. Gammer ◽  
B. Escher ◽  
C. Ebner ◽  
A. M. Minor ◽  
H. P. Karnthaler ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Range Order ◽  
Medium Range Order ◽  
Medium Range

scholarly journals Short-to-Medium-Range Order and Atomic Packing in Zr48Cu36Ag8Al8 Bulk Metallic Glass

Metals ◽  
2016 ◽  
Vol 6 (10) ◽  
pp. 240 ◽  
Author(s):  
Yong Xu ◽  
Meijie Yu ◽  
Rongfu Xu ◽  
Xianzhong Wang ◽  
Zhigang Wang ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Range Order ◽  
Atomic Packing ◽  
Medium Range Order ◽  
Medium Range

Superconductivity and fluctuation effects in a fractal dimensional bulk metallic glass: Correlation with medium range order

2020 ◽  
Vol 25 ◽  
pp. 101427
Author(s):  
N.K. Sarkar ◽  
B. Vishwanadh ◽  
C.L. Prajapat ◽  
P.D. Babu ◽  
G. Ravikumar ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Range Order ◽  
Medium Range Order ◽  
Medium Range ◽  
Fluctuation Effects

Observations of structural order in ion-implanted amorphous silicon

2001 ◽  
Vol 16 (11) ◽  
pp. 3030-3033 ◽  
Author(s):  
Ju-Yin Cheng ◽  
J. M. Gibson ◽  
D. C. Jacobson
Keyword(s):  
Electron Microscopy ◽  
Amorphous Silicon ◽  
Random Network ◽  
Dark Field ◽  
Range Order ◽  
Length Scale ◽  
Medium Range Order ◽  
Medium Range ◽  
Fluctuation Electron Microscopy ◽  
Ion Implanted

Medium-range order in ion-implanted amorphous silicon has been observed using fluctuation electron microscopy. In fluctuation electron microscopy, variance of dark-field image intensity contains the information of high-order atomic correlations, primarily in medium-range order length scale (1–3 nm). Thermal annealing greatly reduces the order and leaves a random network. It appears that the free energy change previously observed on relaxation may therefore be associated with randomization of the network. In this paper, we discuss the origin of the medium-range order during implantation, which can be interpreted as a paracrystalline state, that is, a disordered network enclosing compacts of highly topologically ordered grains on the length scale of 1–3 nm with significant strain fields.

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