Local chemical ordering within the incubation period as a trigger for nanocrystallization of a highly supercooled Ti-based liquid

In the present work we study nanocrystallization of the Ti50Ni23Cu22Sn5 alloy within the supercooled liquid region by using a state-of-the-art experimental technique with elemental mapping at near-atomic resolution especially focusing on the incubation period which is still poorly understood from bo...

Full description

Saved in:
Bibliographic Details
Published in:Materials & design 2018-10, Vol.156, p.504-513
Main Authors: Wang, Zhi, Chen, Chunlin, Ketov, Sergey V., Akagi, Kazuto, Tsarkov, Andrey A., Ikuhara, Yuichi, Louzguine-Luzgin, Dmitri V.
Format: Article
Language:English
Subjects:
Chemical inhomogeneity
Energy barrier
Metallic glass
Nucleation
Supercooled liquid
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:In the present work we study nanocrystallization of the Ti50Ni23Cu22Sn5 alloy within the supercooled liquid region by using a state-of-the-art experimental technique with elemental mapping at near-atomic resolution especially focusing on the incubation period which is still poorly understood from both the theoretical and experimental viewpoint. Molecular dynamics (MD) simulation results performed for the Ti55Ni45 liquid acting as a simplified model system of the (Ti,Sn)55(Ni,Cu)45 alloy illustrate the process of nucleation and provide some additional suggestions. The experiment and MD results indicate formation of nanometer-range chemical rearrangements which are supposed to reduce the energy barrier in the complex energy landscape finally leading to a high density of homogeneously nucleating crystallites after the completion of a macroscopically observed incubation period. [Display omitted] •The nature of incubation period studied from both the theoretical and experimental viewpoint.•Nanocrystallization with elemental mapping at near-atomic resolution sheds light on the nature of the incubation period.•Molecular dynamics illustrates the nucleation process and supports the results.•Nanometer-range chemical rearrangements reduce the energy barrier versus crystallization.
ISSN:0264-1275
1873-4197
DOI:10.1016/j.matdes.2018.07.013