Device for the automatic recording of quantitative pole fiffures

M s. Abstract. The quantitative determination of textures is often required in both research and production. The author describes a device, developed at the Metaalinstituut TNO, to be used with an x-ray texture goniometer for the automatic recording of pole figures. 1. Introduction When the crystals of a solid are not randomly oriented, their crystallographic axes tend to be concentrated about certain preferred directions. By measuring the statistical distribution of these directions, the texture of a specimen can be determined. The preferred orientations must be found whenever one wants to know the anisotropy of a given solid (e.g. for deep drawing of metals). I,., materials having a tance, magnetic properties, etc,, are direction dependent. Hence, it is obviously necessary to determine textures quantitatively , not only in pure crystallographic research but also in the manufacturing industry. Also, the time required for analysis will be of great importance. The x-ray diffraction method is most widely used for the determination of textures. In this, after the abandonment of photographic techniques giving only qualitative answers, much progress was made possible by the development of high precision x-ray counters. This enabled the determination to be made quantitative. 2. Determination by means of a texture goniometer simplified by choosing only certain points of the diagram: these are the points that belong to lines of the same intensity called contour lines (figure I). By doing this one gets a map of the 'mountains' representing the texture of the specimen. 3. The texturograph As the transmission of the registration diagram into a pole registers directly in polar coordinates; this we call a texturo-maph* 3.1. Principle of rhe IexturoRruph To be able to record directly in polar coordinates one has to satisfy two conditions: firstly, one has to follow the stereographic projection of the relative movement of the counter with regard to the specimen; i.e. synchronously with the texture goniometer one has to describe the projection of the registration spiral. Secondly, with regard to each point of the spiral, one has to record the intensity of diffraction according to chosen contour lines. c Figure 2 is a photograph of the device with a quadrant of the record sheet lifted. According to the foregoing Principles texture, the modulus of elasticity, hardness, corrosion re&-figure is time consuming, we have developed a device that For the interpretation of textures pole figures are used. A pole figure of a specimen is a …