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Deformation mechanism,orientation evolution and mechanical properties of annealed cross-rolled Mg-Zn-Zr-Y-Gd sheet during tension

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Journal of Magnesium and Alloys 2023年第7期11卷 2340-2350页

作者： Xia Lin Zhiyong Chen Jianbo Shao Jiangying Xiong Zhang Hu Chuming Liu School of Materials Science and Engineering Central South UniversityChangsha 410083China

Mg-6.75Zn-0.57Zr-0.4Y-0.18Gd(wt.%)sheet with typical basal texture was produced by cross rolling and *** temperature tensile tests were subsequently conducted along rolling direction(RD),transverse direction(TD),and diagonal direction(RD45).Deformation mechanism and orientation evolution during the tension were investigated by quasi-in-situ electron backscatter diffraction observation and in-grain misorientation axis *** results indicate that the activation of deformation mechanism mainly depends on the initial grain *** RD sample,prismaticslip plays an important role in the deformation of grains withaxis nearly perpendicular to the *** theaxis gradually tilted towards the RD,basalslip becomes the dominant deformation *** the tensile fracture,the initial concentrically distributed{0001}pole is split into double peaks extending perpendicular to the RD,and the randomly distributed{1010}pole becomes parallel to the *** evolution in{0001}and{1010}poles during tension is related to the lattice rotation induced by basalslip and prismaticslip,*** and RD45 samples exhibit similar deformation mechanism and orientation evolution as the RD sample,which results in the nearly isotropic mechanical properties in the annealed cross-rolled sheet.

关键词： Magnesium alloys Deformation mechanism orientation evolution Mechanical properties

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evolution mechanism of crystallographic orientation in grain continuator bars of a Ni-based single-crystal superalloy prepared by Bridgman technology during directional solidification

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China Foundry 2022年第1期19卷 35-45页

作者： Jiu-han Xiao Wei-guo Jiang Dong-yu Han Kai-wen Li Guo-jun Tong Yu-zhang Lu Lang-hong Lou Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Weifang University of Science and Technology Shouguang 262700ShandongChina Powerplant Engineering Technical Managements Division Shenyang Maintenance&Overhaul Base China Southern AirlinesShenyang 110000China

Single-crystal rods with different diameters and deviation angles with respect to the solidification direction were produced by Bridgman rapid solidification method at withdrawal rates of 3 and 6 mm·min^(-1) and used as grain *** crystallographic orientation of the rods,which cross-sections were perpendicular to the solidification direction at different solidification heights,was measured by electron backscattered diffraction,while the corresponding microstructures were observed by optical *** mushy zone morphology and the distribution of the temperature gradient were simulated by the finite element analysis software *** experimental results indicate that the crystallographic orientation of the single-crystal rods corresponds to the statistical average value of all the dendrite orientations in *** crystallographic orientation of the primary and secondary dendrites of each single-crystal rod at different cross-sections fluctuates irregularly within a small range(less than 4°).The crystallographic orientation of the dendrite in each single-crystal rod is not exactly consistent with each other and is affected by their branching mode of dendrites in the solidification *** addition,the simulation results show that the mushy zone shapes and the temperature gradient of single-crystal rods change with the increase of solidification height during the solidification ***,the evolution mechanism of the crystallographic orientations and the corresponding influence factors were analyzed and discussed.

关键词： single-crystal superalloy dendrite growth orientation evolution solidification space withdrawal rate cross-section size

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Multi-scale crystal plasticity finite element simulations of the microstructural evolution and formation mechanism of adiabatic shear bands in dual-phase Ti20C alloy under complex dynamic loading

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Journal of Materials Science & Technology 2020年第24期59卷 138-148页

作者： Yu Zhou Qunbo Fan Xin Liu Duoduo Wang Xinjie Zhu Kai Chen School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China National Key Laboratory of Science and Technology on Materials Under Shock and Impact Beijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401135China

A dynamic compression test was performed on α+β dual-phase titanium alloy Ti20C using a split Hopkinson pressure *** formation of adiabatic shear bands generated during the compression process was studied by combining the proposed multi-scale crystal plasticity finite element method with experimental *** complex local micro region load was progressively extracted from the simulation results of a macro model and applied to an established three-dimensional multi-grain microstructure ***,the evolution histories of the grain shape,size,and orientation inside the adiabatic shear band were quantitatively *** results corresponded closely to the experimental results obtained via transmission electron microscopy and precession electron ***,by calculating the grain rotation and temperature rise inside the adiabatic shear band,the microstructural softening and thermal softening effects of typical heavily-deformed α grains were successfully *** results revealed that the microstructural softening stress was triggered and then stabilized(in general)at a relatively high *** indicated that the mechanical strength was lowered mainly by the grain orientation evolution or dynamic recrystallization occurring during early plastic ***,thermal softening increased linearly and became the main softening ***,in the final stage,the thermal softening stress accounted for 78.4% of the total softening stress due to the sharp temperature increase,which inevitably leads to the stress collapse and potential failure of the alloy.

关键词： Titanium alloy Adiabatic shear band Multi-scale crystal plastic finite element method(CPFEM) orientation evolution Softening mechanism

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