A detailed investigation of slip line pattern and subsurface dislocation structure of molybdenum single crystals

Abstract

The slip line pattern and the active slip systems at the top face of [941] and [110] molybdenum single crystals deformed in tension at room temperature are investigated by optical microscopy, surface replica and surface transmission electron microscopy. The latter technique allows to observe simultaneously slip traces and subsurface dislocation structure. Optical microscopy is shown to be insufficient for the characterization of the slip line pattern. The applicability of surface slip traces to obtain information on the activity and slip geometry of dislocations in the bulk crystals is critically discussed.

Mechanical energy losses in plastically deformed and electron plus neutron irradiated high purity single crystalline molybdenum at elevated temperatures

“…In addition, the dislocation density, determined by counting the dislocation lines, was larger in 〈110〉 than in 〈149〉 samples, in agreement with the multiple slip condition for 〈110〉 samples. Dislocations in samples with 〈110〉 orientation were shorter and present higher density of jogs than for the 〈149〉 orientation, which results in agreement with pervious reported works 23–27.…”

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

“…This result is similar to observations made by Luft and Kaun on molybdenum single crystals deformed in tension at room temperature [LUFT 1973]. They proved by surface electron microscopy that slip on (101) planes correlates only with a subsurface dislocation structure and does not give a real impression of slip in the bulk.…”

Interaction processes between vacancies and dislocations in molybdenum in the temperature range around 0.3 of the melting temperature

“…The dislocation structure of deformed molybdenum has been studied by (TEM) in the previous works [27][28][29][30][31]. Samples deformed at room temperature in the deformation range used in this work show screw dislocations with a high density of jogs but few edge dislocations.…”