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Related Experiment Video

Updated: Jul 13, 2025

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Elucidating Interfacial Dynamics of Ti-Al Systems Using Molecular Dynamics Simulation and Markov State Modeling.

Tianjiao Li1, Chenxi Tian1, Atieh Moridi1

  • 1Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York 14853, United States.

ACS Applied Materials & Interfaces
|October 18, 2023
PubMed
Summary

Titanium-aluminum (Ti-Al) alloys exhibit excellent properties but can become brittle after heat treatment. This study reveals a three-stage diffusion mechanism involving aluminum atom movement crucial for optimizing Ti-Al material manufacturing.

Keywords:
Markov state model (MSM)Ti−Al-based materialsinterfacial dynamicsmachine learningmolecular dynamics (MD)

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Area of Science:

  • Materials Science
  • Metallurgy
  • Computational Materials Science

Background:

  • Titanium-aluminum (Ti-Al) based materials offer exceptional mechanical and chemical properties, driving interest in automotive, aerospace, and defense engineering.
  • Despite their advantages, Ti-Al alloys often suffer from brittleness and defects after additive manufacturing and heat treatment, hindering their application.
  • Understanding interfacial dynamics is key to overcoming these manufacturing challenges.

Purpose of the Study:

  • To investigate the interfacial dynamics of Ti-Al systems during heat treatment, focusing on TiAl3 grain boundary behavior.
  • To elucidate the kinetic processes governing TiAl3 formation at the atomic level.
  • To provide insights for optimizing the manufacturing of Ti-Al based materials.

Main Methods:

  • Employed molecular dynamics (MD) simulations to observe atomic behavior under heat treatment conditions.
  • Utilized Markov state modeling (MSM) to analyze the dynamic states and spatial distributions of atoms.
  • Examined transition time scales to quantify the rapidity of atomic diffusion processes.

Main Results:

  • MD simulations showed initial Al atom diffusion towards the Ti surface via TiAl3 grain boundaries during heat treatment.
  • MSM identified three distinct dynamic states for Al atoms in the Ti/Al mixture, each with unique spatial distributions.
  • Al atom dynamics were significantly slower near the Ti surface compared to the Al surface.

Conclusions:

  • A three-stage diffusion mechanism for TiAl3 formation was revealed: Al premelting, diffusion to the Ti surface, and cessation due to increasing Ti concentration.
  • The study provides a comprehensive understanding of interfacial dynamics in Ti-Al systems.
  • These findings can guide the control and optimization of manufacturing processes for high-performance Ti-Al materials.