2011/01/29 by Ho‐Seok Nam, Ho-Seok Nam, David J. Srolovitz +2
Engineering · Materials Science · Physics and Astronomy · #Aluminum Alloy Microstructure Properties #Aluminum Alloys Composites Properties #Microstructure and mechanical properties #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.1101.5712
arxiv created 2011/01/29 · arxiv updated 2011/02/01
While diverse fracture characteristics have been observed in liquid metal embrittlement (LME) depending on the solid-liquid metal pairs, the penetration of nanometer-thick liquid metal films along the grain boundary has been identified as one of the key mechanisms for embrittlement in many classical LME systems, such as Al-Ga, Cu-Bi and Ni-Bi. 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 under a constant strain rate. We identify the grain boundary dislocations that are nucleated at the grain boundary groove tip and climb down along the grain boundary during Ga penetration and characterize their atomic structures based on topological method.