Complete description of structure features of textured metal materials by use of modified X-ray methods and computer data treatment

Yuriy Perlovich ,  Margarita Isaenkova ,  Vladimir Fesenko 

Moscow Engineering Physics Institute (MEPhI), Kashirskoe shosse, Moscow 115409, Russian Federation

Abstract

In the course of technological treatment most metal materials acquire a crystallographic texture, accompanied by the sharp substructure nonuniformity. Grains with different orientations differ in their prehistories, including operated plastic deformation mechanisms and resulting trajectories in the orientational space. The quantitative characterization of inhomogeneous materials ought to base on the distributions of structure parameters instead of their solitary values, relating to grains only with definite orientations. Combining of the diffractometric texture measurement with the registration of profile for the same X-ray line by all successive positions of the sample allows to obtain separate data on the structure of grains with all possible orientations. This results in a multiple increase of accessible information on the structure of studied material and became possible due to the automation of X-ray measurements and computer data treatment. The necessary techniques were developed in details as applied to various metal materials. For grains of each orientation the measured diffraction parameters and calculated substructure parameters are determined. Distributions of these parameters in the stereographic projection (Generalized Pole Figures) are constructed. Besides, distributions of volume fractions of grains, characterized by different values of diffraction and substructure parameters, are constructed as well. The presented experimental results give the most complete, statistically significant picture of substructure conditions in studied material. All substructure parameters of material, calculated on the basis of X-ray data, vary within wide limits, but at the same time obey the quite definite regularities and show the evident mutual correlation. Several general regularities, controlling the development of nonuniform substructure in textured materials, were found for the first time.

 

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Presentation: oral at E-MRS Fall Meeting 2003, Symposium B, by Yuriy A. Perlovich
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-29 14:42
Revised:   2009-06-08 12:55