Molecular Dynamics Simulation of Ga Penetration along Grain Boundaries in Al: A Dislocation Climb Mechanism

Ho-Seok Nam and David J. Srolovitz
Phys. Rev. Lett. 99, 025501 – Published 13 July 2007

Abstract

Many systems where a liquid metal is in contact with a polycrystalline solid exhibit deep liquid grooves where the grain boundary meets the solid-liquid interface. For example, liquid Ga quickly penetrates deep into grain boundaries in Al, leading to intergranular fracture under very small stresses. We report on a series of molecular dynamics simulations of liquid Ga in contact with an Al bicrystal. We identify the mechanism for liquid metal embrittlement, develop a new model for it, and show that is in excellent agreement with both simulation and experimental data.

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  • Received 16 February 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.025501

©2007 American Physical Society

Authors & Affiliations

Ho-Seok Nam1,* and David J. Srolovitz1,2

  • 1Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA
  • 2Department of Physics, Yeshiva University, New York, New York 10033, USA

  • *hnam@princeton.edu

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Vol. 99, Iss. 2 — 13 July 2007

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