Research on the deformation strengthening mechanism of a tungsten heavy alloy by hydrostatic extrusion

The microstructure mechanical properties of the 93 tungsten alloy and the deformation strengthening mechanism of the tungsten alloy by hydrostatic extrusion are studied by static and dynamic tensile experiments, quantitative metallography experiments and the transmission electron microscopy (TEM) analysis in this paper. Varied laws on tungsten grain's effective contiguity on different deformation directions and dislocation densities in tungsten grain and matrix along with the increase of the extrusion ratio are obtained. Through the research we can conclude that a decrease of the axial effective contiguity, a increase of the dislocation density and aspects of the sub-grain in a tungsten grain with large deformation are the main factors to strengthen the tungsten alloy by hydrostatic extrusion.