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Acta Metallurgica Sinica(English Letters) 2024年第6期37卷 999-1006页

作者： Sen Wang hucheng pan Caixia Jiang Zhihao Zeng Zhen pan Weineng Tang Chubin Yang Yuping Ren Gaowu Qin Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) College of Materials Science and EngineeringNortheastern UniversityShenyang110819China Mg and Mg Alloy Institute Technology CenterBaosteel Metal Co.LtdChina Baowu Steel GroupShanghai200940China Jiangxi Provincial Engineering Research Center for Magnesium Alloy Gannan Normal UniversityGanzhou341000China

In this work,the microstructure and mechanical properties of large cross-sectioned Mg-9Gd-3Y-1.2Zn-0.5Zr(VWZ931)samples produced by the small extrusion ratio has been *** as-extruded VWZ931 sample with diameter of~30 mm can exhibit the high yield strength(YS)of 339 MPa,ultimate tensile strength(UTS)of 387 MPa and elongation of 8.2%,*** peak-aged,the YS and UTS of the Mg samples were significantly increased to 435 MPa and 467 *** small extrusion ratio leads to the low fraction of dynamic recrystallized(DRX)grains in VWZ931 sample,and the texture hardening effect can be fully utilized to achieve high *** combined effect of precipitation strengthening due to the long-period stacking ordered phases and theβ′phase,grain boundary strengthening due to the fine DRX grains,heterogeneous deformation-induced strengthening caused by bimodal microstructure,can together contribute to the high strength of present Mg *** findings can shed light on designing other large-sized Mg wrought alloys with high mechanical performance.

关键词： Mg-RE alloy Mechanical property Bimodal grains Texture hardening

低温挤压Mg-Sm-Ce系合金的微观组织与力学性能研究

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航空制造技术 2024年第8期67卷 14-21页

作者：潘虎成蒋彩霞张元王森杜森任玉平秦高梧东北大学材料科学与工程学院沈阳110819 东北大学材料各向异性与织构教育部重点实验室沈阳110819

大幅提升低成本变形镁合金的绝对强度是轻合金研究领域的关键瓶颈问题之一。本研究基于相图计算设计了一种包含低含量轻稀土元素的新型Mg-Sm-Ce-Mn系合金,通过低温挤压实现了近400 MPa的超高强度。Mg-0.8Sm-0.4Ce-0.4Mn(EM10,质量分数,%... 详细信息

大幅提升低成本变形镁合金的绝对强度是轻合金研究领域的关键瓶颈问题之一。本研究基于相图计算设计了一种包含低含量轻稀土元素的新型Mg-Sm-Ce-Mn系合金,通过低温挤压实现了近400 MPa的超高强度。Mg-0.8Sm-0.4Ce-0.4Mn(EM10,质量分数,%)合金经低温挤压后形成了双组态晶粒组织,并表现为典型的丝织构,动态析出了Mg41(Ce,Sm)5和Mg12Ce微米第二相;低的挤压温度及高密度纳米第二相的析出,促进EM10合金的再结晶晶粒尺寸细化至约0.93μm,同时在未再结晶区域内残留有高密度的残余位错;细晶强化、第二相强化、织构强化及位错强化的综合作用,使EM10合金的屈服强度可高达约379 MPa,同时保持约4.7%的延伸率。继续提升Ce和Sm元素的含量,会引入更多的脆性微米级第二相,将损伤合金的塑性。因此,通过低温挤压工艺和成分优化,设计制备出了一种高强度Mg-0.8Sm-0.4Ce-0.4Mn合金,相关结果可为低合金化、超高强度变形镁合金的制备提供理论指导。

关键词：变形镁合金挤压变形力学性能第二相低合金化

Improving mechanical properties of Mg-Sn alloys by co-addition of Li and Al

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Progress in Natural Science:Materials International 2023年第3期33卷 355-363页

作者： Zhen pan hucheng pan Yu Huang Zhihao Zeng Zhang-Zhi Shi Chubin Yang Yuping Ren Lu-Ning Wang Gaowu Qin Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) College of Materials Science and Engineering Northeastern University Beijing Advanced Innovation Center for Materials Genome Engineering Key Laboratory for Advanced Materials Processing of Ministry of Education School of Materials Science and Engineering University of Science and Technology Beijing Jiangxi Provincial Engineering Research Center for Magnesium Alloy Gannan Normal University

In this work, a novel low-alloyed Mg-Sn-Li-Al alloy with high-strength has been developed. The addition of ～1 wt% Li into the Mg-2Sn wt.% binary alloy can change the type of strengthening phases in Mg-2Sn-1Li sample(TL21),involving the formation of both Li2Mg Sn and Mg2Sn phases. The co-addition of ～1 wt% Al and ～1 wt% Li can further induce the higher density of both micron-sized phases and nano-precipitations in the Mg-2Sn-1Li-1Al sample(TLA211). The nano-precipitations can inhibit the grain growth, which thus lead to the fine grain size of ～1.38 μm in TLA211 sample, and ～1.59 μm in the TL21 sample. Besides, the profuse nano-phases would improve the yield strength via Orowan hardening effect. Consequently, the TL21 sample can exhibit the high yield strength of ～204 MPa, and elongation of ～6.6%. The TLA211 sample exhibits the much higher yield strength of～250 MPa, ultimate tensile strength of ～291 MPa, and also high elongation of ～9.0%. The high strength-ductility synergy, together with the low-Sn content, make the present Mg-Sn based alloy to be potential for the wider industrial applications.

关键词： Mg wrought alloy Nano-precipitations Strengthening Grain refinement Mechanical properties

Grain refinement and strength enhancement in Mg wrought alloys: A review

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Journal of Magnesium and Alloys 2023年第11期11卷 4128-4145页

作者： Sen Wang hucheng pan Dongsheng Xie Dongdong Zhang Jingren Li Hongbo Xie Yuping Ren Gaowu Qin Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) College of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Liaoning Academy of Materials Institute of Materials PlanificationShenyang 110167China

Low absolute strength becomes one major obstacle for the wider applications of low/no rare-earth(RE) containing Mg alloys. This review firstly demonstrates the importance of grain refinement in improving strength of Mg alloys by comprehensively comparing with other strategy, e.g., precipitation strengthening. Dynamic recrystallization(DRX) plays a crucial role in refining grain size of Mg wrought ***, secondly, the DRX models, grain nucleation mechanisms and the related grain refinement abilities in Mg alloys are summarized,including phase boundary, twin boundary and general boundary induced recrystallization. Thirdly, the newly developed low-RE containing Mg alloy, e.g., Mg-Ce, Mg-Nd and Mg-Sm based alloys, and the RE-free Mg alloys, e.g., Mg-Al, Mg-Zn, Mg-Sn and Mg-Ca based alloy,are reviewed, with the focus on enhancing the mechanical properties mainly via the grain refinement strategy. At the last section, the perspectives and outstanding issues concerning high-performance Mg wrought alloys are also proposed. This review is meant to promote the deep understanding on the critical role of grain refinement in Mg alloys and provide reference for the development of other high strength and low-cost Mg alloys which are fabricated by the conventional extrusion/rolling processing.

关键词： Magnesium alloy Grain refinement Strengthening Dynamic recrystallization Microstructure control

Achieving high strength above 400 MPa in conventionally extruded Mg-Ca-Zn ternary alloys

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Science China(Technological Sciences) 2022年第3期65卷 519-528页

作者： DU Sen YANG Kun LI Man LI JingRen REN YuPing HUANG QiuYan pan hucheng QIN GaoWu Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

In this work,the role of Zn content in modifying the microstructure and mechanical properties of the Mg-1.2Ca-xZn(x=0.6,2.0 wt.%,named as XZ10-0 and ZX21-0,respectively)based alloys was studied,and it is found that the yield strength(YS)of the present Mg-(Zn)-Ca based alloys increases monotonically with increasing the Zn concentration,from~339 MPa in low-Zn content XZ10-0 sample to~406 MPa in high-Zn content ZX21-0 *** characterization shows that the enhanced YS can be attributed to the grain refinement,fine and dispersed nano-phases,a large number of lamellae structures,and the decrease of recrystallization *** results show that the formation mechanism for the ultra-fine grains in present Mg-(Zn)-Ca based alloys can be attributed to the co-segregation of Ca and Zn elements at the grain boundary,as well as the dynamic *** the Zn content is high,the nano-phases in ZX21-0 sample belong to the Ca;Mg;Zn;ternary phases,which exert much higher thermal stability than the nano-sized Mg2 Ca binary phases formed in the low-Zn content XZ10-0 *** finer size and higher number density of the nano-Mg Zn Ca phases lead to the much finer grain size and sub-grain lamellae thickness in ZX21-0 sample,which thus results in the higher YS of~406 MPa.

关键词： wrought Mg alloy dynamic recrystallization mechanical property co-segregation

Low-cost and high-strength Mg-Al-Ca-Zn-Mn wrought alloy with balanced ductility

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International Journal of Minerals,Metallurgy and Materials 2022年第7期29卷 1396-1405页

作者： Kun Yang hucheng pan Sen Du Man Li Jingren Li Hongbo Xie Qiuyan Huang Huajun Mo Gaowu Qin Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China The First Sub-Institute Nuclear Power Institute of ChinaChengdu 610005China

A novel low-cost Mg-Al-Ca-Zn-Mn-based alloy was developed to simultaneously improve its strength and *** high yield strength of 411 MPa and the high elongation to failure of~8.9%have been achieved in the as-extruded Mg-1.3Al-1.2Ca-0.5Zn-0.6Mn(wt%)*** characterizations showed that the high strength is mainly associated with the ultra-fined dynamically recrystallized(DRXed)***,high-density dislocations in the un-DRXed region and nano-precipitates are distributed among theα-Mg *** high ductility property can be ascribed to the high volume fraction of DRXed grains with a much randomized texture,as well as the formations of high-density subgrains in the un-DRXed grain regions.

关键词： Mg wrought alloy mechanical property dynamic recrystallization texture nano-precipitation

Two-dimensional interface superstructures assembled by well-ordered solute atoms

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Journal of Materials Science & Technology 2023年第11期142卷 253-259页

作者： Peijun Yang Shanshan Li Hongbo Xie Jianfeng Jin Chuangwei Liu hucheng pan Yuping Ren Weitao Jia Yaping Zong Gaowu Qin Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China School of Mechanical and Power Engineering Shenyang University of Chemical TechnologyShenyang 110142China College of Mechanical Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China

Segregation of solutes/impurities in the interfaces plays a decisive role in material ***,the segregation of solutes/impurities remains elusive due to the diversity of interfacial ***,in a Mg-Nd-Mn ternary model system,two ordered novel two-dimensional(2D)interfacial superstructures formed by periodic segregation of solute atoms in special symmetric and asymmetric tilt grain boundaries(GBs)have been systematically investigated.Z-Contrast high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM)observations provided the atomic-level details on how solute atoms were arranged on these special partially coherent tilt *** strained conditions of each atomic site at the tilt GBs were accurately reproduced by molecular dynamics(MD)simulations plus Voronoi analysis,and the rationality of solute segregation in each atomic-site was evaluated carefully based on the first-principles *** findings expand our knowledge of solute/impurity segregation behaviors in the interfaces,especially the co-segregation behaviors in multi-component materials.

关键词： Magnesium alloy Interfacial segregation Molecular dynamics First-principles HAADF-STEM

Variable precipitation behaviors of Laves phases in an ultralight Mg-Li-Zn alloy

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镁合金学报(英文) 2023年第6期11卷 2018-2026页

作者： Weixin Lou Hongbo Xie Xiaobo Zhao Junyuan Bai Hehang Zhang Yi Wang Xinze Li hucheng pan Yuping Ren Gaowu Qin Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Research Center for Metal Wires Northeastern UniversityShenyang 110819China

Precipitation habits plays a decisive role in strengthening materials,especially for Mg alloys the non-basal plane precipitation is necessary but very ***,the precipitates would nucleate and grow up in a specific habit plane owing to the constraint of free-energy minimization of the ***,in an aged ultralight Mg-Li-Zn alloy,we confirmed that the precipitates dominated by C15 Laves structure could form in a variety of habit planes,to generate three forms of strengthening-phases,i.e.,precipitate-rod,precipitate-lath,and *** which,the precipitate-plates are on basal plane as usually but precipitate-rods/laths are on non-basal plane,and such non-basal precipitates would transform into the basal(Mg,Li)Zn_(2)Laves structure with prolonged *** findings are interesting to understand the precipitation behaviors of multi-domain Laves structures in hexagonal close-packed crystals,and expected to provide a guidance for designing ultralight high-strength Mg-Li based alloys via precipitation hardening on the non-basal planes.

关键词： Laves phase Precipitation Habit plane Orientation Magnesium alloys

Irradiation damage behavior of the non-equal atomic AlNbMoZrB high-entropy alloy

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Progress in Natural Science:Materials International 2023年第6期33卷 864-871页

作者： Sheng Wang Caixia Jiang hucheng pan Hongyu Shang Tong Fu Dongsheng Xie Changqing Teng Wei Zhang Yu Wu Lu Wu Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) College of Materials Science and Engineering Northeastern University The First Sub-institute Nuclear Power Institute of China Institute of Nuclear Fuel Element Materials Nuclear Power Institute of China

In this work,the non-equal atomic AlNb2MoZr0.75B0.05high entropy alloy(HEA) was developed and irradiated under Kr+*** results show that the AlNb2MoZr0.75B0.05sample exhibits a large lattice distortion and good microstructure stability,which can contribute to both high strength and high irradiation *** phase analysis for as-irradiated AlNb2MoZr0.75B0.05sample shows that dendrites region maintains the BCC structure,while the Zr5Al3-typed phases in interdendrite region are amorphized,and the behavior of fission gases Kr in AlNbMoZrB HEA is described in ***,both 1/2 and dislocation loops are detected in irradiated B-containing HEA *** relevant results can shed light on designing other highperformance HEAs with integrated functional and structural properties.

关键词： High entropy alloy Lattice distortion Microstructure stability Neutron poison Radiation damage

Cr添加对NbMoZr系高熵合金力学性能与微观组织的影响

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中国铸造装备与技术 2024年第3期59卷 74-81页

作者：王涛时洁潘虎成商洪宇滕常青张伟吴璐东北大学材料科学与工程学院材料各向异性与织构教育部重点实验室辽宁沈阳110819 中国核动力研究设计院第一研究所四川成都610041

采用电弧熔炼法成功制备了Nb_(50)Mo_(30)Zr_(20)及(Nb_(50)Mo_(30)Zr_(20))_(100-x)Cr_(x)(x=5、10、15,对应Cr5、Cr10及Cr15)合金,并系统研究了Cr含量对相结构、微观组织与力学性能的影响规律。研究结果表明,Cr元素的添加使NbMoZr合金由单一BCC结构相组织转变为富Mo、Nb的BCC基体相与富Zr、Cr、Nb的Laves相组成的双相组织,同时二次枝晶壁间距也逐渐减小。X射线衍射(XRD)和透射电子显微镜(TEM)分析表明,Laves相对应于FCC结构的Cr_2(Nb,Zr)相。因此,随着Cr含量的增加,压缩屈服强度逐渐从NbMoZr合金的1288 MPa提升至Cr15合金的1924 MPa,Laves相诱导的第二相强化以及枝晶细化导致的细晶强化是强度提升的主要机制。对比三种含Cr合金,发现Cr10合金表现出最优的强塑性匹配,屈服强度1690MPa,塑性应变9.0%,有望成为弥散性核燃料金属基体的有利候选材料之一。

关键词：难熔高熵合金力学性能 Laves相相结构强化机制

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