Microstructure and mechanical behavior of Mg-5Zn matrix influenced by particle deformation zone
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第1期
论文作者：Quan-xin Shi Cui-ju Wang Kun-kun Deng Kai-bo Nie Yucheng Wu Wei Liang
摘 要：The effect of particle deformation zone（PDZ） on the microstructure and mechanical properties of SiCp/Mg-5Zn composites was studied.Meanwhile,the work hardening and so ftening behavior of SiCp/Mg-5Zn composites influenced by PDZ size were analyzed and discussed using neutron diffraction under in-situ tensile deformation.The evolution of FWHM（full width at half maximum） extracted from the diffraction pattern of SiCp/Mg-5Zn composites was used to interpret the modification of dislocation density during in-situ tension,which discovered the effect of dislocation on the work hardening behavior of SiCp/Mg-5Zn composites.In addition,the tensile stress reduction（△Pi） values during in-situ tension test were calculated to analyze the effect of PDZ size on the softening behavior of SiCp/Mg-5Zn composites.The results show that the work hardening rate of SiCp/Mg-5Zn composites increased with the enlargement of PDZ size,which was attributed to the grain size of SiCp/Mg-5Zn composites increased with the enlargement of PDZ size.Moreover,the stress reduction（△Pi） values increased continuously during in-situ tensile for SiCp/Mg-5Zn composites due to the increased stored energy produced during plastic deformation,which provided a driving force for the softening effect.However,the effect of grain size on the softening behavior is greater than that of the stored energy,which led to the tensile stress reduction（△Pi） values of P30(dPDZ=30 μm)-SiCp/Mg-5Zn composite were higher than that of P60(dPDZ=60 μm)-SiCp/Mg-5Zn composite when the εri were 0.25,0.5,0.75 and 1,respectively.
Quan-xin Shi1，Cui-ju Wang1，Kun-kun Deng1,2，Kai-bo Nie1,2，Yucheng Wu1,2，Wei Liang1,2
1. Shanxi Key Laboratory of Advanced Magnesium-Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology2. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology
摘 要：The effect of particle deformation zone（PDZ） on the microstructure and mechanical properties of SiCp/Mg-5Zn composites was studied.Meanwhile,the work hardening and so ftening behavior of SiCp/Mg-5Zn composites influenced by PDZ size were analyzed and discussed using neutron diffraction under in-situ tensile deformation.The evolution of FWHM（full width at half maximum） extracted from the diffraction pattern of SiCp/Mg-5Zn composites was used to interpret the modification of dislocation density during in-situ tension,which discovered the effect of dislocation on the work hardening behavior of SiCp/Mg-5Zn composites.In addition,the tensile stress reduction（△Pi） values during in-situ tension test were calculated to analyze the effect of PDZ size on the softening behavior of SiCp/Mg-5Zn composites.The results show that the work hardening rate of SiCp/Mg-5Zn composites increased with the enlargement of PDZ size,which was attributed to the grain size of SiCp/Mg-5Zn composites increased with the enlargement of PDZ size.Moreover,the stress reduction（△Pi） values increased continuously during in-situ tensile for SiCp/Mg-5Zn composites due to the increased stored energy produced during plastic deformation,which provided a driving force for the softening effect.However,the effect of grain size on the softening behavior is greater than that of the stored energy,which led to the tensile stress reduction（△Pi） values of P30(dPDZ=30 μm)-SiCp/Mg-5Zn composite were higher than that of P60(dPDZ=60 μm)-SiCp/Mg-5Zn composite when the εri were 0.25,0.5,0.75 and 1,respectively.
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