文献详情
Contrasting Bonding-Interaction-Induced Distinct Relaxation in La65Ni35 and La65Al35 Glass-Forming Alloys
文献类型：期刊
期刊名称：The journal of physical chemistry. B
年：2019
卷：123
期：5
页码：1149-1155
ISSN：1520-5207
所属部门：物理学系
摘要：The α and β relaxations are two fundamental processes in glass-forming materials, and quite important for many of the properties. Although intensive studies have found that α and β relaxations can be tuned by changing the constituent elements, the underlying structural basis is still elusive. Here, we explored the effect of two key elements of Al and Ni on distinct β and α relaxations in La65Al35 and La65Ni35 glass-forming alloys via classical and ab initio molecular dynamics simulations combine ...More
The α and β relaxations are two fundamental processes in glass-forming materials, and quite important for many of the properties. Although intensive studies have found that α and β relaxations can be tuned by changing the constituent elements, the underlying structural basis is still elusive. Here, we explored the effect of two key elements of Al and Ni on distinct β and α relaxations in La65Al35 and La65Ni35 glass-forming alloys via classical and ab initio molecular dynamics simulations combined with dynamical mechanical spectroscopy. Unexpected coupling of relaxation in both β and α relaxation time scales is observed for La and Al atoms in the La65Al35 system, which drastically suppresses the relaxation dynamics. It is revealed that the dynamic coupling of La and Al results from the covalent-like bonding interaction between Al atoms, which connect Al together, forming a network-like structure. The bonding network not only drastically slows down the dynamics of Al but also couples the motion of La and Al together. This finding elucidates the underlying basis of Al and Ni elements for distinct β and α relaxation and sheds light on tuning the formation and properties of metallic glasses by minor alloying. ...Hide

DOI：10.1021/acs.jpcb.8b09188
百度学术：Contrasting Bonding-Interaction-Induced Distinct Relaxation in La65Ni35 and La65Al35 Glass-Forming Alloys
语言：外文
作者其他论文



Correlation Between Local Atomic Symmetry and Mechanical Properties in Metallic Glasses.Li M Z.材料科学技术学报.2014,30(6),551-559.
Size effect on dynamics and glass transition in metallic liquids and glasses.Li, Y. Z.;Sun, Y. T.;Lu, Z.,等.JOURNAL OF CHEMICAL PHYSICS.2017,146(22).