scholarly journals Bringing order to large-scale disordered complex metal alloys: Gd2Au15−xSbxand BaAuxGa12−x

CrystEngComm ◽  
2018 ◽  
Vol 20 (3) ◽  
pp. 348-355 ◽  
Author(s):  
Chris Celania ◽  
Volodymyr Smetana ◽  
Anja-Verena Mudring
Keyword(s):  
Large Scale ◽  
Metallic Alloys ◽  
Metal Alloys ◽  
Complex Metal ◽  
Complex Metallic Alloys

New complex metallic alloys, BaAuxGa12−xand Gd2Au15−xSbx, display entire planes of disordered atom sites, forming a set planar conformations.

Complex Metallic Alloys for Applications in Magnetic Refrigeration

2015 ◽  
Vol 8 (2) ◽  
pp. 129-154
Author(s):  
Benjamin Podmiljsak ◽  
Paul J. McGuiness ◽  
Spomenka Kobe
Keyword(s):  
Magnetic Refrigeration ◽  
Metallic Alloys ◽  
Complex Metallic Alloys

Crack Growth and Propagation in Metallic Alloys

1995 ◽  
Vol 409 ◽  
Author(s):  
W. C. Morrey ◽  
L. T. Wille
Keyword(s):  
Large Scale ◽  
Critical Strain ◽  
Cleavage Plane ◽  
Crack Tip ◽  
Metallic Alloys ◽  
Propagation Direction ◽  
Dynamics Simulation ◽  
Parallel Computer ◽  
Massively Parallel ◽  
Tip Position

AbstractUsing large-scale molecular dynamics simulation on a massively parallel computer, we have studied the initiation of cracking in a Monel-like alloy of Cu-Ni. In a low temperature 2D sample, fracture from a notch starts at a little beyond 2.5% critical strain when the propagation direction is perpendicular to a cleavage plane. We discuss a method of characterizing crack tip position using a measure of area around the crack tip.

High temperature oxidation of AlCrFe complex metallic alloys

2014 ◽  
Vol 89 ◽  
pp. 118-126 ◽  
Author(s):  
N. Prud’homme ◽  
P. Ribot ◽  
M. Herinx ◽  
P. Gille ◽  
B. Bauer ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Metallic Alloys ◽  
Temperature Oxidation ◽  
Complex Metallic Alloys

Measurement of the Absorption of Microwave Power by Corroded Metals

1988 ◽  
Vol 124 ◽  
Author(s):  
Ralph W. Bruce ◽  
R. A. Quar
Keyword(s):  
Stainless Steels ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Surface Conductivity ◽  
Metallic Alloys ◽  
Metal Alloys ◽  
Electrical Measurements ◽  
Organic Mixture ◽  
Heat Treated ◽  
Microwave Signals

ABSTRACTMetal alloys, when exposed to a salt/organic environment at elevated temperatures, corrode resulting in a decrease in the surface conductivity. This decrease can be monitored and assessed via the measurement of the incident and reflected microwave signals impinging upon the corroded surface. Several metallic alloys, stainless steels and inconels, were treated with a salt/organic mixture (proprietary) and heat treated at 1100 F. Periodically, the metals were removed from the furnace, allowed to cool to room temperature, and measured electrically. The samples were re-coated with the salt/organic mixture and re-heat treated. The electrical measurements showed a generally increased power absorption as corrosion thickness increased.

Atomic Dynamics in Complex Metallic Alloys

2013 ◽  
Vol 1517 ◽  
Author(s):  
Holger Euchner ◽  
Stephane Pailhès ◽  
Tsunetomo Yamada ◽  
Ryuji Tamura ◽  
Tsutomu Ishimasa ◽  
...  
Keyword(s):  
Lattice Dynamics ◽  
Structural Complexity ◽  
Building Blocks ◽  
Metallic Alloys ◽  
Strong Reduction ◽  
Large Numbers ◽  
Unit Cells ◽  
Dynamics Simulations ◽  
The Impact ◽  
Complex Metallic Alloys

ABSTRACTComplex Metallic Alloys (CMAs) are metallic solids of high structural complexity, consisting of large numbers of atoms in their unit cells. Consequences of this structural complexity are manifold and give rise to a variety of exciting physical properties. The impact that such structural complexity may have on the lattice dynamics will be discussed. The surprising dynamical flexibility of Tsai-type clusters with the symmetry breaking central tetrahedron will be addressed for Zn6Sc, while in the Ba-Ge-Ni clathrate system the dynamics of encaged Ba guest atoms in the surrounding Ge-Ni host framework is analysed with respect to the experimentally evidenced strong reduction of lattice thermal conductivity. For both systems experimental results from neutron scattering are analyzed and interpreted on atomistic scale by means of ab initio and molecular dynamics simulations, resulting in a picture with the respective structural building blocks as the origin of the peculiarities in the dynamics.

Exelfs As A Tool For Investigating The Local Structure Of Bulk Glass-Forming Metal Alloys

1999 ◽  
Vol 5 (S2) ◽  
pp. 138-139
Author(s):  
F, M. Alamgir ◽  
Y. Ito ◽  
D. B. Williams ◽  
H. Jain
Keyword(s):  
Metallic Glasses ◽  
Local Structure ◽  
Chemical Interaction ◽  
Random Packing ◽  
Metallic Alloys ◽  
Metal Alloys ◽  
Bulk Glass ◽  
Glass Forming ◽  
Structure Of Glasses ◽  
Intellectual Challenge

The discovery of amorphous, or glassy, metallic alloys in 1959 posed an intellectual challenge. How can one describe the structure of glasses when there is no long-range periodicity? What can the structure tell us about why certain metal alloys form glasses more easily than others? First, some universal characteristics, if any exist, of the structure metallic glasses needed to be found. A convincing model was proposed for the structure of metallic glasses based on Bernal’s dense random packing (DRP) structure. Central to this proposal is the idea that the structure of metallic glasses is that of the random filling of space by non-interacting identical spheres. In this model, strongly directional interatomic bonds do not play an important role in determining the structure of metallic glasses. This model is hpwever in conflict with one proposed by Chen, which correlates increased glass formability with increased chemical interaction between dissimilar atoms.

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