Abstract
In the present work, changes of material structure under the action of applied stress with the aid of the photometric analysis of structure images (PHASI) are discussed. For this purpose, amorphous and polycrystalline Fe-Zr-B alloy samples were subjected to the action of mechanical loads in a special setup. Then their surface was investigated without unloading by PHASI, which was developed by the authors. The method is based on the combined analysis of the surface areas of the samples and the spectra of the brightness of their visible light reflection The PHASI method makes it possible to reveal and quantitatively characterize the structural changes in material upon deformation. It clearly fixes the beginning of the development of main crack at the stage of its transition to the steady growth and, thus, can be considered as a technical tool for early diagnostics of the failure of constructions
Highlights
The problem of the improvement in mechanical characteristics of structural materials does not lose its urgency in spite of comprehensive periodic and monographic literature dedicated by its different aspects
It was shown that the theoretical strength of metals for both limiting conditions such as dislocation-free filamentary crystals and the metals saturated by dislocations up to the maximum density (~1013 cm-2) is the same [3]
Insufficiently high mechanical and thermal resistance of the dislocation structures formed upon strain hardening of structural materials forces researchers to search for principally different ways to solve the problem of the development of highstrength materials
Summary
The problem of the improvement in mechanical characteristics of structural materials does not lose its urgency in spite of comprehensive periodic and monographic literature dedicated by its different aspects. In view of the fact that the starting stresses of dislocations are extremely low, the possibilities of strain hardening were connected with the presence of internal barriers in the material The role of such barriers belongs to elements of initial structure or to fine particles purposely introduced into the matrix for withstanding the overload from the pinned planar dislocation pileups, which are abundantly present and evenly distributed in the material [4]. The use of metals in the amorphous and nanostructural state as the structural materials is another alternative for the solution of this problem The studies in both directions are conducted sufficiently intensely, their results provide neither comprehensive scientific substantiation of the production technologies for such materials and articles from them nor their practical large-scale use in the contemporary industry. The purpose of this work is the correct comparison of the strength characteristics of Fe-Zr-B based alloy in the nanostructural and crystalline states and the evaluation of the role of structural factors in their difference
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