Abstract
The Solidification of Alloys is Typically Controlled by Solute Diffusion Due to the Solute Partitioning Happening at the Solid-Liquid Interface. in This Study, We Show that the Switching from Solute Diffusion-Controlled Growth to Thermal Diffusion-Controlled Growth May Happen at the Solidification Front during Rapid Solidification Processes of Alloys Such as Additive Manufacturing using a Phase-Field Model. the Switching is Found to Be Triggered by the Cooling of the Solid-Liquid Interface When It Becomes Colder Than the Solidus Temperature. the Switching Introduces a Sudden Jump of Growth Velocity, an Increase in Solute Concentration, and the Refining of the Resulting Microstructures. All Those Changes Predicted by the Phase-Field Simulations Agree with Experimental Observations Quantitatively. the Switching of Control Mechanisms Can Be Exploited by Manipulating the Processing Conditions to Form Refined Microstructures or Layered Structures for Improved Mechanical Properties.
Recommended Citation
Y. Gu et al., "Switching of Control Mechanisms during the Rapid Solidification of a Melt Pool," Physical Review Materials, vol. 7, no. 10, article no. 103401, American Physical Society, Oct 2023.
The definitive version is available at https://doi.org/10.1103/PhysRevMaterials.7.103401
Department(s)
Materials Science and Engineering
International Standard Serial Number (ISSN)
2475-9953
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2023 American Physical Society, All rights reserved.
Publication Date
01 Oct 2023
Comments
National Science Foundation, Grant OAC-1919789