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Microscopic stresses in carbon nanotube reinforced aluminum matrix composites determined by in-situ neutron diffraction

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Journal of Materials Science & Technology 2020年第19期54卷 58-68页

作者： X.X.Zhang J.F.Zhang Z.Y.Liu W.M.Gan M.Hofmann H.Andrä B.L.Xiao Z.Y.Ma Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China German Engineering Materials Science Centre at MLZ Helmholtz-Zentrum GeesthachtD-85747 GarchingGermany Heinz Maier-Leibnitz Zentrum(MLZ) Technische Universität MünchenD-85747 GarchingGermany Fraunhofer Institute for Industrial Mathematics Fraunhofer-Platz 1Kaiserslautern 67663Germany

One of the most desired strengthening mechanisms in the carbon nanotube reinforced aluminum matrix composites(CNT/Al)composites is the load transfer strengthening mechanism(LTSM).However,a fundamental issue concerning the LTSM is that quantitative measurements of load partitioning in these composites during loading are very *** this study,in-situ neutron diffraction study on the tensile deformation of the 3 vol.%CNT/2009 Al composite and the unreinforced 2009 Al alloy was ***{311}and{220}diffraction elastic constants(DECs)of the 2009 Al alloy were *** those DECs the average stress in the 2009 Al matrix of the composite was *** the average stress in the CNTs was separated by using the stress equilibrium *** homogenization models were also applied to explain the stress evolution in each *** results agree with experimental *** the present case,the average stress in the CNTs reaches 1630 MPa at the yield strength of the composite based on linear regression of the measured data,which leads to an increment of yield strength by about 37 *** the result of this work,an approach to quantify load partitioning in the CNTs is developed for the CNT/Al composites,which can be applied to optimize the mechanical properties of the composites.

关键词： Carbon nanotubes Aluminum matrix composites in-situ neutron diffraction Load partitioning

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Investigation of the Micro-Mechanics of an Extruded Precipitation-Strengthened Magnesium Alloy under Cyclic Loading

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Journal of Materials Science and Chemical Engineering 2024年第7期12卷 40-52页

作者： Chuhao Liu Xiaodan Zhang Huamiao Wang Yinghong Peng State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University Shanghai China School of Mechanics and Engineering Science Shanghai University Shanghai China

Precipitation strengthening is a crucial microscopic mechanism for enhancing the strength of magnesium alloys. In order to elucidate the influence of precipitation on the microscopic deformation mechanisms and macroscopic mechanical response of magnesium alloys under cyclic loading conditions, we employed a crystal plasticity model to analyze the stress-strain curves, specific crystal plane diffraction intensities, and the temporal evolution of various microscopic deformation mechanisms and twinning volume fractions for an extruded magnesium alloy, AXM10304, containing coherent precipitates. The research findings indicate that precipitation does not fundamentally alter the microscopic mechanisms of this alloy. However, it hinders twinning during the compression stage, mildly promotes detwinning during the tension stage, and enhances tension secondary hardening by elevating the difficulty of activation of the prismatic slip.

关键词： Cyclic Deformation Magnesium Alloy in-situ neutron diffraction Precipitation Strengthening Crystal Plasticity Lattice Strain Mechanism Evolution

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A Study on Micromechanical Behaviors of Multi-phase steel during Uniaxial Loading

A Study on Micromechanical Behaviors of Multi-phase steel du...

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Asia Steel International Conference 2012(Asia Steel 2012)

作者： J.S.Kim E.Y.Kim Y.H.Choi C.U.Jeong W.C.Woo S.-H.Choi Department of Materials Science and Metallurgical Engineering Sunchon National UniversitySunchonJeonnam540-742South Korea neutron Science Division Korea Atomic Energy Research InstituteDaejeon305-600South Korea

＜正＞The stress-strain relationship between ferrite and martensite phases in the commercial dual-phase DP980 steel was studied by using in-situ neutron diffraction and the crystal plasticity finite element method（CPFEM）.The phase identification method based on the image quality（IQ） of electron backscatter diffraction（EBSD） and a filtering process was used to obtain information concerning individual crystallographic orientations for ferrite and martensite phases in DP980 ***（200） and （211） lattice strains of ferrite and martensite phases were measured along the loading and transverse directions as a function of macroscopic stress using the in-situ neutron diffraction.A CPFEM based on representative volume elements（RVEs） was applied to determine the microscopic hardening parameters for each phase by fitting the measured macroscopic stress and measured（200） and（211） lattice strains.

关键词： Dual phase in-situ neutron diffraction Lattice strain EBSD CPFEM

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