The Study of Deformation of Thin Foils of Mo under the Electron Microscope

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Abstract
The slip geometry in molybdenum has been studied at room temperature by tensile deformation of thin foils under an electron microscope. The orientation of the tensile axis was in the middle of the stereographic triangle, consequently the system with maximum resolved shear stress was (101) [111]. Observations have shown that the choice of slip systems depends not only on the orientation factor of the slip systems but very strongly on the orientation of the foil plane. In the present work this phenomenon is explained by assuming that the difference in the mobilities of screw and edge dislocations is sufficiently large to influence the choice of slip systems. The most active systems are those where the dislocation loops can easily lose their screw component to the surface leaving the edge component to propagate through the foil.