The local orientational orders and structures of liquid and amorphous metals Au and Ni during rapid solidification

• Published in: Physica. B, Condensed matter Condensed matter, 1997-08, Vol.239 (3), p.267-273
• Main Authors: WANG, L, LIU, H, CHEN, K, HU, Z
• Format: Article
• Language: English
• Subjects: Amorphous semiconductors, metals, and alloys; Applied sciences; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Disordered solids; Exact sciences and technology; Liquid metals and alloys; Local orientational orders; Materials science; Metals. Metallurgy; Molecular dynamics; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Rapid solidification; Solidification; Structure of solids and liquids; crystallography; Studies of specific liquid structures
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/S0921-4526(97)00304-9

Based on the empirical embedded-atom method, the molecular dynamics studies of the local orientational orders and structures of liquid and amorphous solid of FCC-type metals Au and Ni are performed. During the rapid solidification, the amorphous structures can be obtained and their amorphous transition temperatures are determined. The icosahedral ordering and the short-range ordering are enhanced, and FCC-type as well as HCP-type ordering changes slightly during the quench of Au and Ni. In the mean time, the BCC-type ordering of Au is Ni enhanced, but that of Ni is weakened. The results of the simulation also indicate that the diffusion coefficients in Au and Ni decrease rapidly with decreasing temperature above their glass transition temperatures.