Grain Orientation Studies on Polycrystalline Titanium by Means of Electron Channeling Patterns

Abstract

Preferred orientation textures are known to develop in wrought commercial products, such as rolled sheet or extruded tubing, depending on the material type and on the forming process. Substantial deviations from an arrangement of randomly oriented polycrystalline grains can occur. The amount and type of preferred orientation is customarily determined by x-ray diffraction measurements. That technique averages over a large number (102 to 104) of grains. This paper will describe an investigation of orientation texture in commercial titanium speet on a grain-by-grain basis. Selected area electron channeling patterns (SACP) were obtained from individual grains in the polycrystalline specimens and provided accurate orientation data. Those data were required to explain particular morphological features observed in a recent investigation of the active dissolution of titanium in sulphuric acid.