Neutron Diffraction Texture Analysis of Multi‐Phase Systems

Abstract

Neutron diffraction methods for texture analysis are closely parallel to well-known X-ray diffraction techniques. The chief advantage of neutron diffraction over X-ray diffraction, however, arises from the fact that the interaction of neutrons with matter is relatively weak, and consequently the penetration depth of neutrons is 102–103 times larger than that of X-rays. Hence neutron diffraction is an efficient tool for measuring textures in multi-phase systems. Based on the high transmission of a neutron beam the effect of anisotropic absorption in multi-phase materials can be neglected in most cases. Moreover, the analysis of bulk textures becomes possible, such that textures in a wide variety of multi-phase systems can be studied which are of special interest in engineering and science (metals, alloys, composites, ceramics and geological specimens).

Influence of Initial Texture, Temperature and Total Strain on the Texture Development of Polycrystalline Pyrrhotite Ores in Deformation Experiments

“…Especially the conjugated shear fractures of sample Su8-300 show a smaller degree of plastic deformation for this compression direction than for the other samples. In samples which were compressed with an angle of 35 degrees to the c-axis maximum the deformation partly takes place by ductile shear parallel to Neutron texture analyses on the Sullivan ore were performed at the diffractometer TEX-2 at GKSS research centre Geesthacht using the angle dispersive method (Brokmeier 1989, Gertel 1992. Pole figures of the (1120) and (1012) reflections were measured.…”

Textures in Multiphase Materials: A Review

“…(Bunge, 1990 Underwood, 1961;Wassermann and Grewen, 1962;Kudrawzew, 1965;Coulomb, 1972;Bunge, 1982;Bunge, 1986;Welch andPuch, 1986 andSchwarzer andWeiland, 1988a. In the case of multiphase materials, particularly low symmetry crystals characterized by a manifold of reflections with partly high peak overlap, it is sometimes difficult to measure the texture of all existing phases. Table 1 shows examples of some common materials (Brokmeier, 1989). Figure 1 shows the extreme line-rich neutron diffractogram of a lherzolithe sample (composed of olivine, orthoenstatite, clinoenstatite and some accessory Table 1 Number of Bragg-reflections for some common materials (-<80 in 20; , =0.25 rim; dmi, =0.1944 rim), using the Joint Committee on Powder Diffraction Standards (JCPDS) files, (Brokmeier, 1989 (Brokmeier, 1989 ).…”

“…Table 1 shows examples of some common materials (Brokmeier, 1989). Figure 1 shows the extreme line-rich neutron diffractogram of a lherzolithe sample (composed of olivine, orthoenstatite, clinoenstatite and some accessory Table 1 Number of Bragg-reflections for some common materials (-<80 in 20; , =0.25 rim; dmi, =0.1944 rim), using the Joint Committee on Powder Diffraction Standards (JCPDS) files, (Brokmeier, 1989 (Brokmeier, 1989 ). This problem is widely encountered for multiphase materials such as rocks or ceramics.…”

Neutron Texture Investigations on Natural Mt. Isa Chalcopyrite Ore–Part I: Preferred Orientation of one and the Same Chalcopyrite Sample Before and After Experimental Deformation

“…The texture measurements were performed at TEX-2, the neutron texture diffractometer (Brokmeier, 1989). The structural data of chalcopyrite were used to calculate the theoretical 2-Theta positions of the reflections for a wavelength of 0.134 nm (Cu(111) monochromator).…”