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Evolution of phase stresses in Al/SiCp composite during thermal cycling and compression test studied using diffraction and self-consistent models

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Journal of Materials Science & Technology 2020年第1期36卷 176-189页

作者： Przemyslaw Kot Andrzej Baczmański elzbietaa gadalińska Sebastian Wroński Marcin Wroński Miroslaw Wróbel Gizo Bokuchava Christian Scheffzük Krzysztof Wierzbanowski AGH University of Science and Technology Faculty of Physics and Applied Computer Scienceal.Mickiewicza 3030-059 Krakow.Poland Institute of Aviation Materials&Structures Research Centeral.Krakowska 110/11402-256 WarsawPoland AGH University of Science and Technology Faculty of Metals Engineering and Industrial Computer Scienceal.Mickiewicza 3030-059 KrakowPoland Joint Institute for Nuclear Research Frank Laboratory of Neutron PhysicsJoliot-Curie 6141980 DubnaRussia Karlsruhe Institute of Technology Institute of Applied GeosciencesAdenauerring 20b76131 KarlsruheGermany

In this work,the evolutions of stresses in both phases of the Al/SiCp composite subjected to thermal cycling during in situ compression test were measured using Time of Flight neutron *** was confirmed that inter-phase stresses in the studied composite can be caused by differences in the coefficient of thermal expansion for the reinforcement and matrix,leading to a different variation of phase volumes during sample heating or *** results of the diffraction experiment during thermal cycling were well predicted by the Thermo-Mechanical Self-Consistent *** experimental study of elastic-plastic deformation was carried out in situ on a unique diffractometer EPSILON-MDS(JINR in Dubna,Russia)with nine detector banks measuring interplanar spacings simultaneously in 9 orientations of scattering *** the first time,the performed analysis of experimental data allowed to study the evolution of full stress tensor in both phases of the composite and to consider the decomposition of this tensor into deviatoric and hydrostatic *** was found that the novel Developed Thermo-Mechanical SelfConsistent model correctly predicted stress evolution during compressive loading,taking into account the relaxation of thermal origin hydrostatic *** comparison of this model with experimental data at the macroscopic level and the level of phases showed that strengthening of the Al/SiCp composite is caused by stress transfer from the plastically deformed A12124 matrix to the elastic SiCp reinforcement,while thermal stresses relaxation does not significantly affect the overall composite properties.

关键词： Stress relaxation Strengthening mechanism Plastic deformation Multiscale model Metal matrix composites Neutron diffraction

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