Ab initio molecular dynamics simulations of nano-crystallization of Fe-based amorphous alloys with early transition metals

• 来源期刊: 中国物理B（英文版）
• 关键词: ab initio molecular dynamics Fe-based amorphous alloys nano-crystallization atomic diffusion
• 年，卷（期）: 2018,（11）
• 页码范围: 300-304
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/11/116401

摘要

The addition of early transition metals (ETMs) into Fe-based amorphous alloys is practically found to be effective in reducing the α-Fe grain size in crystallization process.In this paper,by using ab initio molecular dynamics simulations,the mechanism of the effect of two typical ETMs (Nb and W) on nano-crystallization is studied.It is found that the diffusion ability in amorphous alloy is mainly determined by the bonding energy of the atom rather than the size or weight of the atom.The alloying of B dramatically reduces the diffusion ability of the ETM atoms,which prevents the supply of Fe near the grain surface and consequently suppresses the growth of α-Fe grains.Moreover,the difference in grain refining effectiveness between Nb and W could be attributed to the larger bonding energy between Nb and B than that between W and B.