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Tensile Test of a Nanoscale Rod of a Binary Metallic Glass Carried out by Molecular
Dynamics Simulation
This type of work has been carried out graduate student Hyon-Jee Lee working in the Materials Simulation Center (Prof. Goddard) in collaboration with the Johnson research group. In the video, colored dots represent the two types of atoms which make up the binary alloy. During tensile deformation, the rod undergoes plastic flow and ultimately "necks" down prior to failure. By analyzing the atomic scale rearrangements which take place in the bar during the test, we have been able to identify the microscopic "shear" events which give rise to large scale plastic flow. It has been show that atomic clusters of 10-100 atoms undergo cooperative rearrangement during flow.

For further information, please contact Professor Bill Johnson, team leader of IRG 2: (626) 395-4433 or wlj@caltech.edu.