Abstract
A method is described which enables complete pole figures of metal sheet to be obtained using the reflection technique alone. A small known displacement of the sample from the centre of the texture goniometer is made and this significantly reduces absorption at high tilt angles (the outer region of the pole figure). The displacement introduced requires a wider receiving slit in order to collect an adequate fraction of the diffracted x-rays. The overall improvement in peak-to-background ratio is such that reproducible, complete pole figures can be produced. No loss in the detail contained in the pole figures has been observed due to the misalignment of the goniometer geometry.
Highlights
The reflection goniometer originally proposed by Schultz (1949) is the most common instrument used for obtaining pole figures describing the preferred orientation of the grain structure in metal sheets
Alternative methods for obtaining complete pole figures include the following. (i) Combining both reflection and transmission figures (Hu et al, 1952), this can be time consuming and matching the figures may be difficult if the texture varies through the thickness of the sample. (ii) Making a composite specimen of several thicknesses of sheet and cutting it so that a complete quadrant of the pole is obtained in reflection (Lopata and Kula, 1962)
Precise experimental details were not given and the application of their expression requires a measurement of the misalignment for each change in geometry
Summary
A method is described which enables complete pole figures of metal sheet to be obtained using the reflection technique alone. A small known displacement of the sample from the centre of the texture goniometer is made and this significantly reduces absorption at high tilt angles (the outer region of the pole figure). The displacement introduced requires a wider receiving slit in order to collect an adequate fraction of the diffracted x-rays. The overall improvement in peak-to-background ratio is such that reproducible, complete pole figures can be produced. No loss in the detail contained in the pole figures has been observed due to the misalignment of the goniometer geometry
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