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Information × Registration Number 0305U003267, 0103U004202 , R & D reports Title Influence of structural changes of a different level on polycrystalline materials mechanical properties popup.stage_title Вивчення особливостей деформаційних, релаксаційних та акомодаційних процесів у сплавах в умовах надпластичності Head Sirenko A.F., Registration Date 04-03-2005 Organization Kharkov national university named after V.N. Karazin popup.description2 Subjects of research - two-dimensional aluminium polycrystals, Pb - 62% Sn eutectic alloy. Research objectives - studying of the structural relaxation at plastic deforma-tion of two-dimensional aluminium polycrystals, clarification of the role of grain boundary types in rotational effects appearance and development and establish-ment of correlation between deformation processes, structural changes, phase transformations, which realized in superplastic behavior conditions of Pb - 62% Sn eutectic alloy. Influence of grain boundary types at plastic rotations appearance and develop-ment character in two-dimensional aluminium polycrystals have been investigated experimentally. It is shown that at plastic deformation of aluminium samples in grain-boundary spectrum of which share of the boundaries close to special ones is significant, rotational effects are manifested more intensively and plasticity of such samples is higher than one of the samples with lesser share of boundaries close to special ones. Thus,increasing of special and close to special grain boundaries in samples investigated lead to intensive evolution of rotations, changing plastic deformation character of aluminium polycrystals. Kinetic dependences of internal friction Q-1(t) and Young modulus E(t) of Pb - 62% Sn alloy casting in isothermal endurance conditions at Т? 293K have been investigated with help of resonance bend vibration method. Kinetic dependences of internal friction and normal elasticity modulus of alloy, which testify about pe-riodic character of processes passing in the alloy in external cycling strain condi-tions at constant temperature. Product Description popup.authors popup.nrat_date 2020-04-02 Close