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Deformation Modes and Structure Evolution in Laser-Shock-Loaded Molybdenum Single Crystals of High Purity

Verformungsmechanismen und Strukturentwicklung in laserschockbehandelten Molybdäneinkristallen hoher Reinheit
 
: Kaspar, J.; Luft, A.; Skrotzki, W.

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Crystal research and technology 35 (2000), No.4, pp.437-448
ISSN: 0023-4753
ISSN: 0232-1300
English
Journal Article
Fraunhofer IWS ()
Laserschock; Molybdän; Mikrostruktur; mechanische Zwillingsbildung; Gleitung; TEM

Abstract
This paper reports on the microstructural changes occurring within molybdenum single crystals after shock treatment with an excimer laser-system in a confined ablation mode with different number of impacts. Using different complementary investigation methods (optical microscopy, scanning electron microscopy and transmission electron microscopy) it is found that slip and twinning are active modes of deformation during the shock-induced plastic deformation. After laser treatment with a single laser pulse slip bands on {112} planes containing several microscopic twins are the dominating microstructural feature, whereas further laser-shock-processing leads to the formation of a homogeneous arrangement of screw dislocations, tangles and loops. Deformation modes and microstructure in laser shocked samples prove to be quite similar to those of explosive shocked specimens although the laser-induced peak pressure is about an order of magnitude lower than that during explosive loading.

: http://publica.fraunhofer.de/documents/N-1004.html