DTIC ADA205110: Topological Features of Structural Relaxations pdf

DTIC ADA205110: Topological Features of Structural Relaxations

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The topological features of atom motions in a high -temperature melt, a subcooled melt above Tg, and a glass below Tg, were analysed in detail by means of a two-dimensional molecular dynamics simulation. A striking analogy was observed between the structure and properties of the liquid-like material separating quasi-ordered domains of atom clusters, and high angle grain boundaries. The main feature of the structural relaxation below the melting point, both above and below Tg was the gradual dissolution and disappearance of the liquid-like material, permitting increasing order in the previously quasi- ordered domains and a growth in their sizes. In these processes, many sequences reminiscent of cancellation of dislocation pairs, or mutual reactions to give more stable sets were observed. Structural relaxations, Amorphous media, Computer simulation

• Creator/s: Defense Technical Information Center
• Date: 1/23/1989
• Year: 1989
• Book Topics/Themes: DTIC Archive, Deng, Derguo, MASSACHUSETTS INST OF TECH CAMBRIDGE, *ATOMS, *SUPERCOOLING, *AMORPHOUS MATERIALS, *MELTS, *COMPUTERIZED SIMULATION, HIGH TEMPERATURE, MOTION, CLUSTERING, DISLOCATIONS, MEDIA, RELAXATION, CANCELLATION, MOLECULAR PROPERTIES, MELTING POINT, GRAIN BOUNDARIES, TWO DIMENSIONAL, STRUCTURAL PROPERTIES, DYNAMICS, STABILITY, HIGH ANGLES, SIMULATION

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