Molecular dynamics simulation of Ga penetration along grain boundaries in Al: a dislocation climb mechanism.
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.
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA. hnam@princeton.edu
Ho-Seok
HS
Nam
David J
DJ
Srolovitz