Correlation between the Local Atomic Structure of Melts and Glass Forming Ability in Zr-Cu-Ni-Al Alloys  

作　　者：WU Chen HUANG Yong-Jiang SHEN Jun 吴臣;黄永江;沈军(School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001)

机构地区：[1]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001

出　　处：《Chinese Physics Letters》2013年第10期128-131,共4页中国物理快报（英文版）

摘　　要：The correlation between the atomic structure of melts and glass forming ability(GFA)in Zr_(53)Cu_(18.7)Ni_(12)Al_(16.3) and Zr_(50.7)Cu_(28)Ni_(9)Al_(12.3)(abbreviated as Zr53 and Zr507,respectively)alloys are studied by first principle simulations.The topological structure can be described by the Al-centered Kasper polyhedra and other distorted clusters with extrinsic disclinations.Due to the lower Al content in the Zr507 melts,its number of icosahedra is larger than that of the Zr53 melts.Also,the icosahedra in the Zr507 melts possess smaller distortion than those of the Zr_(53) melts,making the icosahedra more stable in the Zr507 melts.These two structural differences contribute to the slow dynamics and further enhance the GFA in the Zr507 alloy.

关 键 词：ALLOYS structure DISTORTION 

分 类 号：TG1[金属学及工艺—金属学]