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Dissociation of edge and screw pyramidal Ⅰ and Ⅱ dislocations in magnesium

Journal of Magnesium and Alloys 2023年第12期11卷 4498-4512页

作者： Yang Yang Fei Liu Kefan Chen Boyu Liu Zhiwei Shan Bin Li Department of Chemical and Materials Engineering University of NevadaRenoNV 89557USA Center for Advancing Materials Performance From The Nanoscale(CAMP-Nano)and Hysitron Applied Research Center in China(HARCC) State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049PR China

pyramidal dislocations in magnesium (Mg) and other hexagonal close-packed metals play an important role in accommodating plastic strains along the *** single crystal Mg only presents very limited plasticity in c-axis compression,and this behavior was attributed to out-of-plane dissociation of pyramidal dislocations onto the basal plane and resulted in an immobile dislocation *** contrast,other simulations and experiments reported in-plane dissociation of pyramidal dislocations on their slip ***,the core structure and mode of dissociation of pyramidal dislocations are still not well *** better understand the dissociation behavior of pyramidal dislocations in Mg at room temperature,in this work,atomistic simulations were conducted to investigate four types of pyramidal dislocations at 300 K:edge and screw Py-Ⅰ on{1011},edge and screw Py-Ⅱ on{1122}by using a modified embedded atom method (MEAM) potential for Mg and anisotropic elasticity dislocation *** results show that when energy minimization was performed before relaxation,in-plane dissociation of edge dislocations on respective pyramidal plane could be obtained at room temperature for all four types of *** energy minimization,the edge dislocations dissociated out-of-plane onto the basal *** of potential energy and hydrostatic stress of individual atoms at the edge dislocation core show that the extraordinarily high energy and atomic stresses in the as-constructed dislocation structures caused the out-of-plane dissociation onto the basal *** core structures of all four types of pyramidal dislocation after in-plane dissociation were analyzed by computing the distribution of the Burgers vector.

关键词： Magnesium pyramidal dislocations Atomistic simulations

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Heterogeneous fiberous structured Mg-Zn-Zr alloy with superior strength-ductility synergy

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Journal of Materials Science & Technology 2023年第3期134卷 67-80页

作者： Wei Fu Pengfei Dang Shengwu Guo Zijun Ren Daqing Fang Xiangdong Ding Jun Sun State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China

Here we reported a heterogeneous fiberous structured Mg-5.6Zn-0.6Zr(wt%)alloy obtained by conventional extrusion method,which exhibited high yield strength of∼345 MPa,ultimate tensile strength of∼370 MPa,and high tensile strain of∼20.5%,superior to most of the Mg-Zn based alloys reported so *** extraordinarily high mechanical properties were mainly attributed to the heterogeneous fiberous structure consisting of alternating coarse-and fine-grain *** in the different layers grew into the neighboring layers,ensuring a good layer bonding.A high Schmid factor and geometric compatibility factor for pyramidal slip led to full slip transfer between the neighboring coarse grains and fine grains,which could help to release the stress concentration and avoid early *** profuse acti-vatedglide dislocations could render the unprecedented high tensile *** constraint by the hard fine-grain domains made the soft coarse-grain domains strong like the hard fine-grain domains,as well as the nanoscale precipitates pinning dislocations,contributed to the high *** hetero-geneous microstructure design was shown to have synergistic improvement in strength-ductility balance,which could be an inspiring strategy to improve mechanical properties of hexagonal close-packed(hcp)metals.

关键词： ZK60 Mg alloy Heterogeneous fiberous structure High strength-ductility synergy pyramidal dislocations Bimodal grain sizes

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