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Accession Number:

AD1155099

Title:

Phase-Field Modeling of Nonequilibrium Solidification Processes in Additive Manufacturing

Author(s):

• Allen, Jeffrey B.
• Moser, Robert D.
• McClelland, Zackery B.
• Islam, Md Mohaiminul
• Liu, Ling

Author Organization(s):

• ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS
• Temple University

Report Date:

2021-11-01

Abstract:

This project models dendrite growth during nonequilibrium solidification of binary alloys using the phase-field method (PFM). Understanding the dendrite formation processes is important because the microstructural features directly influence mechanical properties of the produced parts. An improved understanding of dendrite formation may inform design protocols to achieve optimized process parameters for controlled microstructures and enhanced properties of materials. To this end, this work implements a phase-field model to simulate directional solidification of binary alloys. For applications involving strong nonequilibrium effects, a modified antitrapping current model is incorporated to help eject solute into the liquid phase based on experimentally calibrated, velocity-dependent partitioning coefficient. Investigated allow systems include SCN, Si-As, and Ni-Nb. The SCN alloy is chosen to verify the computational method, and the other two are selected for a parametric study due to their different diffusion properties. The modified antitrapping current model is compared with the classical model in terms of predicted dendrite profiles, tip undercooling, and tip velocity. Solidification parameters--the cooling rate and the strength of anisotropy--are studied to reveal their influences on dendrite growth. Computational results demonstrate effectiveness of the PFM and the modified antitrapping current model in simulating rapid solidification with strong nonequilibrium at the interface.

Document Type:

Conference:

Journal:

Pages:

35

DOI:

10.21079/11681/42605

File Size:

1.13MB

Contracts:

Grants:

Descriptors:

• computational science
• materials science
• additive manufacturing
• materials
• manufacturing
• mechanical properties
• phase transformations
• engineering
• information systems
• liquid phases
• binary alloys
• engineers
• diffusion coefficient
• free energy
• phase
• phase diagrams
• physical properties

Identifiers:

• dendrites growth
• binary systems (metallurgy)
• directional solidification
• pfm(phase-field method)
• Echebarria

SubjectCategory:

• Mechanical, Industrial, Civil and Marine Engineering
• Chemistry

Communities of Interest:

• Energy and Power Technologies

Distribution Statement:

Approved For Public Release

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