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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Indirect Fabrication of Lattice Metals with Thin Sections Using Centrifugal Casting
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A Phase-Field Model for In-Space Manufacturing of Binary Alloys.

Manoj Ghosh1, Muhannad Hendy2, Jonathan Raush3

  • 1Department of Mechanical Engineering, Michigan State University, East Lansing, MI 48824, USA.

Materials (Basel, Switzerland)
|January 8, 2023
PubMed
Summary
This summary is machine-generated.

A new phase-field model enhances understanding of metallic part solidification in space manufacturing. This improves particle adherence and component integrity for In-Space Manufacturing (ISM) using Fused Deposition Modeling (FDM).

Keywords:
additive manufacturingdiffuse interphasepartitionless solidificationphase transformation

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Area of Science:

  • Materials Science
  • Computational Physics
  • Additive Manufacturing

Background:

  • Component integrity in In-Space Manufacturing (ISM) using Fused Deposition Modeling (FDM) is limited by particle adhesion during solidification.
  • Understanding melting and solidification is crucial for improving mechanical properties of printed metallic parts.

Purpose of the Study:

  • To develop a computationally tractable phase-field model for binary alloy solidification.
  • To simulate and analyze the solidification process for nickel-copper (Ni-Cu) alloy feedstocks.

Main Methods:

  • Developed a phase-field model for binary alloy solidification, ensuring stability across temperatures.
  • Derived Ginzburg-Landau equations for phase transformation kinetics and solved them analytically for dilute solutions.
  • Calculated concentration profiles and partition coefficients as a function of interface velocity, validated with numerical simulations.

Main Results:

  • The phase-field model accurately captures microstructure evolution during solidification.
  • The partition coefficient (k) was determined as a function of interface velocity for Ni-Cu alloys.
  • Simulations explored interface velocity dependence on undercooling for various solidification models.

Conclusions:

  • The developed phase-field model provides a robust framework for studying alloy solidification in ISM.
  • This research contributes to enhancing the mechanical integrity of 3D-printed metallic components for space applications.