Abstract
A novel X-ray diffraction-based method and computer program X-TEX has been developed to determine the microstructure in individual texture components of polycrystalline, textured materials. Two different approaches are presented. In the first one, based on the texture of the specimen, the X-TEX software provides optimized specimen orientations for X-ray diffraction experiments in which diffraction peaks consist of intensity contributions stemming from grain populations of separate texture components in the specimen. Texture-specific diffraction patterns can be created by putting such peaks together from different measurements into an artificial pattern for each texture component. In the second one, the X-TEX software can determine the intensity contributions of different texture components to diffraction peaks measured in a particular sample orientation. According to this, peaks belonging mainly to one of the present texture components are identified and grouped into the same quasi-phase during the evaluation procedure. The X-TEX method was applied and tested on tensile-deformed, textured, commercially pure titanium samples. The patterns were evaluated by the convolutional multiple whole profile (CMWP) procedure of line profile analysis for dislocation densities, dipole character, slip systems and subgrain size for three different texture components of the Ti specimens. Significant differences were found in the microstructure evolution in the two major and the random texture components. The dislocation densities were discussed by the Taylor model of work hardening.
Highlights
Crystallographic texture plays a significant role in the mechanical response of structural materials [1,2]
The resultingInvalues forthe theresults microstructural parameters plotted for parameters the differentare texture components separately
In the present work a novel method based on X-ray diffraction has been described which has been developed to characterize the microstructure in individual texture components of textured materials separately
Summary
Crystallographic texture plays a significant role in the mechanical response of structural materials [1,2]. In structural materials with hexagonal close-packed (hcp) structure, especially in. Zr, Mg and their alloys, the role of texture is even more significant [3,4,5,6,7,8]. Texture influences most of the mechanical, physical and chemical properties of polycrystalline materials, rendering these properties anisotropic [1]. From the practical point of view, the anisotropy in these properties may or may not be a desirable feature [2]. Improvement in the mechanical properties such as strength, ductility or toughness can often be achieved through microstructural control or texture optimization.
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