Dislocation loop driven phase transition in three dimensions, bulk melting and overheated solids

Lund, Fernando

doi:10.1016/0022-3093(93)90015-p

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Is There a Connexion Between Dislocation Activity And Amorph1

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1994

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“…This process is too slow and we show that amorphization has already taken place when glide bands form. If dislocations are to be involved in the amorphization process, they have to be created by a more rapid mechanism like for instance the nucleation ex nihilo of a myriad of small dislocation loops (Lund 1993).…”

Section: Is There a Connexion Between Dislocation Activity And Amorphmentioning

confidence: 99%

Microstructures of AIPO4 subjected to high shock pressures

Gratz

Doukhan²,

Nellis

1994

Phys Chem Minerals

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Abstract. Berlinite single crystal specimens were shocked to peak pressures 12 and 24 GPa. Specimens were placed in an AI capsule to minimize shock-wave reflections at interfaces between specimen and capsule. Shock pressures were achieved with a 6.5-m-long two-stage gun. The shock-induced microstructures in recovered specimens were then investigated by Transmission Electron Microscopy. In the sample shocked at 12 GPa, the prominent shock-induced defects are dislocations and basal a glide appears to be the only glide system activated. In contrast, the sample shocked at 24 GPa exhibits no dislocations. The material is partially converted into an amorphous phase occurring under the form of thin amorphous lamellae parallel to the {10in} planes (n=0, 2, 3, 4). This microstructure is very similar to the one observed in experimentally shocked quartz.

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Section: Is There a Connexion Between Dislocation Activity And Amorphmentioning

confidence: 99%