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quasi in-situ ebsd analysis of twinning-detwinning and slip behaviors in textured AZ31 magnesium alloy subjected to compressive-tensile loading

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Journal of Magnesium and Alloys 2022年第4期10卷 956-964页

作者： Yuzhi Zhu Dewen Hou Qizhen Li School of Mechanical and Materials Engineering Washington State UniversityPullmanWA 99164United States Micron School of Materials Science and Engineering Boise State UniversityBoise 83725-1030 IDUnited States

Twinning and detwinning behavior,together with slip behavior,are studied in a textured AZ31 magnesium alloy under compressive and tensile strains along the rolling direction(RD)after each interrupted mechanical test via quasi in-situ electron backscattered diffraction *** results show that twinning firstly takes place under the compressive strain along the *** the increasing compressive strain,{1012}tensile twins firstly nucleate,then propagate,and finally *** under a reversed tensile strain along the RD,detwinning *** nucleation happens during ***,tensile twins can detwin at lower tensile strain,followed by thinning,shortening,and *** are also activated to accommodate the plastic *** the matrix,prismatic slip can only dominate at relatively high ***,basal slip *** in the twins,prismatic slip can activate at lower strains,which is ascribed to the texture reorientation.

关键词： Magnesium alloy Twinning Detwinning Prismatic slip quasi in-situ ebsd

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Solute drag-controlled grain growth in magnesium investigated by quasi in-situ orientation mapping and level-set simulations

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Journal of Magnesium and Alloys 2023年第7期11卷 2312-2325页

作者： Risheng Pei Yujun Zhao Muhammad Zubair Sangbong Yi Talal Al-Samman Institut für Metallkunde und Materialphysik RWTH Aachen University52056 AachenGermany Institute of Materials and Process Design Helmholtz-Zentrum Hereon21502 GeesthachtGermany Department of Metallurgical and Materials Engineering Faculty of ChemicalMetallurgical&Polymer EngineeringUniversity of Engineering&Technology(UET)LahorePakistan Institute for Materials Ruhr-Universität Bochum44801 BochumGermany

Critical properties of metallic materials,such as the yield stress,corrosion resistance and ductility depend on the microstructure and its grain size and size *** atoms that favorably segregate to grain boundaries produce a pinning atmosphere that exerts a drag pressure on the boundary motion,which strongly affects the grain growth behavior during *** the current work,the characteristics of grain growth in an annealed Mg-1 wt.%Mn-1 wt.%Nd magnesium alloy were investigated by advanced experimental and modeling *** quasi in-situ orientation mappings with a scanning electron microscope were performed to track the evolution of local and global microstructural characteristics as a function of annealing *** segregation at targeted grain boundaries was measured using three-dimensional atom probe ***-set computer simulations were carried with different setups of driving forces to explore their contribution to the microstructure development with and without solute *** results showed that the favorable growth advantage for some grains leading to a transient stage of abnormal grain growth is controlled by several drivers with varying importance at different stages of *** longer annealing times,residual dislocation density gradients between large and smaller grains are no longer important,which leads to microstructure stability due to predominant solute *** fluctuations in residual dislocation energy and solute concentration near grain boundaries cause different boundary segments to migrate at different rates,which affects the average growth rate of large grains and their evolved shape.

关键词： Magnesium alloys Grain growth quasi in-situ ebsd Level-set simulation Solute drag Dislocation density gradient

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