caa a22 4500 477058841 CHVBK 20180405111354.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF02437018 doi (NATIONALLICENCE)springer-10.1007/BF02437018 Fatigue failure mechanism of polycrystalline materials at the mesoscopic level [Elektronische Daten] [T. Elsukova, V. Panin] Systematic studies of the mesoscopic mechanisms of deformation of polycrystalline materials of lead and its alloys have been carried out under conditions of sign-alternating bending at room temperature. It has been shown that fatigue failure is due to the evolution of vortices of mesoscopic substructures. Multiple slip separated in adjacent grains is the basis for this kind of deformation. This causes extremely strong localization of the displacement in individual favorably oriented grains and self-organization of these grains in agreement with regular structural levels of deformation. In polycrystalline lead, the mesoscopic substructure has a block character, with each block containing several grains. The elements of such substructures are nucleated in stress mesoconcentrator zones which arise at the grain boundaries under conditions of intense grain boundary slippage. In the course of cycling they gradually propagate through the whole transverse cross section of the sample, which completes its failure. Alloying substantially changes the character of the mesoscopic substructures which are formed. We have considered the different types of vortex mesoscopic substructures and studied their connection with cyclical endurance of the alloy. Recommendations for increasing the fatigue endurance of plastic polycrystalline materials are given. Plenum Publishing Corporation, 1996 Elsukova T. aut Panin V. aut Russian Physics Journal Kluwer Academic Publishers-Consultants Bureau 39/6(1996-06-01), 534-547 1064-8887 39:6<534 1996 39 11182 https://doi.org/10.1007/BF02437018 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02437018 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Elsukova T. aut NATIONALLICENCE 700 1- Panin V. aut NATIONALLICENCE 773 0- Russian Physics Journal Kluwer Academic Publishers-Consultants Bureau 39/6(1996-06-01), 534-547 1064-8887 39:6<534 1996 39 11182 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer