Medium-range Orders in Amorphous Alloys and Their Role on the Plasticity: A Molecular Dynamics Viewpoint Study

2010 ◽  
Vol 48 (2) ◽  
pp. 101-108 ◽  
Author(s):  
Chang-Myeon Lee ◽  
Mirim Lee ◽  
Kwang-Ryeol Lee ◽  
Kyung-Han Kang ◽  
Byeong-Joo Lee ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Amorphous Alloys ◽  
Medium Range

APFIM Studies of Nanocrystallizations of Amorphous Alloys

1995 ◽  
Vol 400 ◽  
Author(s):  
K. Hono ◽  
Y. Zhang ◽  
A. Inoue ◽  
T. Sakurai
Keyword(s):  
Amorphous Alloys ◽  
Amorphous Matrix ◽  
Primary Crystallization ◽  
Atom Probe ◽  
Nucleation And Growth ◽  
Cu Alloy ◽  
Nucleation Sites ◽  
Medium Range ◽  
Crystallization Reaction ◽  
Primary Crystals

AbstractThis paper reports recent atom probe analysis results of Fe-Zr-B(-Cu) and Al-Ni-Ce(-Cu) amorphous alloys, in which nanocrystalline microstructures develop by primary crystallization. In these alloy systems, enrichment of slow diffusing solute was found at the interfaces between primary crystals and amorphous matrix during the nucleation and growth stage. In the case of ternary Fe-Zr-B, no evidence for compositional heterogeneities were found prior to the onset of crystallization reaction. On the other hand, clustering of Cu atoms was observed in quaternary Fe-Zr-B-Cu alloy prior to the crystallization reaction. In the ternary Fe-Zr-B alloy, nucleation sites seem to be provided by the quenched-in nuclei which were observed as medium range ordered (MRO) domains by HREM. In the as-quenched Al-Ni-Ce(-Cu) alloy, compositional fluctuations were present from the as-quenched state. These observations suggest that nuclei for primary crystallization are provided in various forms such as MRO domains, solute clusters and compositional heterogeneities.

Simulation of Microstructure and Dynamical Properties in Ni-Al Alloy under Different Pressures

2015 ◽  
Vol 723 ◽  
pp. 575-579
Author(s):  
T.Z. Liu ◽  
Zheng Fu Cheng ◽  
Ji Hong Xia ◽  
Xu Yang Xiao ◽  
H. Huang ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Metallic Glasses ◽  
Amorphous Alloys ◽  
Pair Distribution Function ◽  
Atomic Clusters ◽  
Dynamics Simulation ◽  
Al Alloy ◽  
Liquid Alloys ◽  
Dynamical Properties ◽  
Second Peak

The connection of atomic clusters has been investigated using molecular-dynamics simulation to explain the splitting of the second peak of the pair-distribution function in amorphous alloys. It is found that the unevenness of the connecting style of atomic clusters results in the splitting of the second peak and the two subpeaks is caused by a three-atom-shared connection and a one-atom-shared connection between atomic clusters. The underlying reason is that metallic glasses have higher density than liquid alloys and a different connecting style of atomic clusters from crystals.

Short- and medium-range structure of amorphous zircon from molecular dynamics simulations

2006 ◽  
Vol 74 (21) ◽  
Author(s):  
Jincheng Du ◽  
Ram Devanathan ◽  
L. René Corrales ◽  
William J. Weber ◽  
Alastair N. Cormack
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Medium Range ◽  
Dynamics Simulations
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