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

作　　者：Przemyslaw Kot Andrzej Baczmański Elzbietaa Gadalińska Sebastian Wroński Marcin Wroński Miroslaw Wróbel Gizo Bokuchava Christian Scheffzük Krzysztof Wierzbanowski 

机构地区：[1]AGH University of Science and Technology,Faculty of Physics and Applied Computer Science,al.Mickiewicza 30,30-059 Krakow.Poland [2]Institute of Aviation,Materials&Structures Research Center,al.Krakowska 110/114,02-256 Warsaw,Poland [3]AGH University of Science and Technology,Faculty of Metals Engineering and Industrial Computer Science,al.Mickiewicza 30,30-059 Krakow,Poland [4]Joint Institute for Nuclear Research,Frank Laboratory of Neutron Physics,Joliot-Curie 6,141980 Dubna,Russia [5]Karlsruhe Institute of Technology,Institute of Applied Geosciences,Adenauerring 20b,76131 Karlsruhe,Germany

出　　处：《Journal of Materials Science & Technology》2020年第1期176-189,共14页材料科学技术（英文版）

基　　金：supported by grants from the National Science Centre,Poland(NCN)No.UMO-2017/25/B/ST8/00134 and UMO2015/19/D/ST8/00818;supported by the Polish-JINR Programme 2017(item 24);supported by the Federal Ministry for Education and Research in Germany。

摘　　要：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 diffraction.It 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 cooling.The results of the diffraction experiment during thermal cycling were well predicted by the Thermo-Mechanical Self-Consistent model.The 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 vector.For 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 components.It 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 stresses.The 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.In this work,the evolutions of stresses in both phases of the Al/SiC_p composite subjected to thermal cycling during in situ compression test were measured using Time of Flight neutron diffraction.It 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 cooling.The results of the diffraction experiment during thermal cycling were well predicted by the Thermo-Mechanical Self-Consistent model.The 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 vector.For 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 components.It 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 stresses.The comparison of this model with experimental data at the macroscopic level and the level of phases showed that strengthening of the Al/SiC_p composite is caused by stress transfer from the plastically deformed A12124 matrix to the elastic SiC_p 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 

分 类 号：TB333[一般工业技术—材料科学与工程]