The hidden disintegration of cluster heterogeneity in Fe-based glass-forming alloy melt

The evolution of liquid metal at high temperature is known much less than their solid states. This is partially due to that the message concerning clusters, metastable phase or heterogeneity in liquid is usually too slight to be traced. Here, we shed some light on the nature of structural evolution...

Full description

Saved in:
Bibliographic Details
Published in:Progress in natural science 2018-12, Vol.28 (6), p.696-703
Main Authors: Dong, Bangshao, Zhou, Shaoxiong, Qin, Jingyu, Li, Ying, Chen, Hui, Wang, Yanguo
Format: Article
Language:English
Subjects:
Alloy melt
Cluster heterogeneity
Fe-based glass-forming alloys
Structural transition
Viscosity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The evolution of liquid metal at high temperature is known much less than their solid states. This is partially due to that the message concerning clusters, metastable phase or heterogeneity in liquid is usually too slight to be traced. Here, we shed some light on the nature of structural evolution of Fe-based glass-forming alloy during overheating process by the investigation of high-temperature melt viscometry and first principles simulations. It was found that a structural transition around 1400 ℃ occurred in the melts of initial homogeneous ingot, heterogeneous ingot and amorphous ribbons jointly, and was confirmed by the results from differential scanning calorimeter (DSC), and ab initio molecular dynamics (AIMD). Combining these results with Fe-Si-B ternary phase diagram and the melting characteristics of Fe-B compounds, it is safe to conclude that the disintegration of Fe2B-type clusters to Fe3B-type clusters leads to the observed transition. These results offer a significant reference for the preparation and property control of Fe-based amorphous alloys. [Display omitted] •Some light on the nature of structural evolution of Fe-based glass-forming alloy during heating and cooling processes was shed.•A structural transition in Fe-based glass-forming alloy melt is found by viscosity, DSC and AIMD.•The disintegration of Fe2B-type clusters to Fe3B-type clusters is concluded to contribute to the observed transition.
ISSN:1002-0071
DOI:10.1016/j.pnsc.2018.09.005