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Thermodynamic prediction of the composition of Fe-based amorphous alloys

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Rare Metals 2007年第5期26卷 504-507页

作者： ren yuping ZHANG Haifeng SUN Wensheng WANG Aimin LI Hong HU Zhuangqi HAO Shiming LI Hongxiao Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Key Laboratory of Anisotropy and Texture of Materials （Ministry of Education） Northeastern University Shenyang 110004 China

The liquidus univariant lines of the Fe-Nb-B ternary system have been thermodynamically calculated by means of CALPHAD method and Fe-based thermodynamic data. It is found that there are two eutectic reactions in the Fe-rich corner,that is,（1） L（Fe-3Nb-15B） →α＋γ＋ M2B （1430 K）,and （2） L（Fe-10Nb-27B） → FeB ＋ Lc14 ＋ M2B （1575 K）. Moreover,the eutectic points are very close to the compositions with high glass forming ability determined experimentally. This means that it is feasible to design the compositions of multicomponent bulk metallic glasses by looking for the eutectic points in the Fe-Nb-B system by means of thermodynamic calculation.

关键词： Fe-Nb-B ternary system amorphous composition prediction thermodynamic calculation eutectic point

预变形Mg-Nd合金时效析出行为的原子尺度

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材料与冶金学报 2024年第2期23卷 164-172页

作者：郭文祥谢红波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

使用球差校正的高角环形暗场扫描透射电镜(HAADF-STEM)系统研究了预变形Mg-20%Nd(质量分数)合金250℃等温时效2 h后的时效析出行为结果表明,预变形产生的位错促进了第二相的形核,导致高密度且有别于传统沿{101-0}α惯习面均匀分布的亚... 详细信息

使用球差校正的高角环形暗场扫描透射电镜(HAADF-STEM)系统研究了预变形Mg-20%Nd(质量分数)合金250℃等温时效2 h后的时效析出行为结果表明,预变形产生的位错促进了第二相的形核,导致高密度且有别于传统沿{101-0}α惯习面均匀分布的亚稳析出相的形成原子尺度的表征结果表明,合金内部形成的析出链主要由βS′相和β1相组成此外,析出链中还含有少量的β″和βH′相,以及βL′相这些片状或透镜状的βS′和β1相与α-Mg基体完全共格,且均具有一个{101-0}α的惯习面,但沿[112-0]α,[12-10]α和[2-110]α3个方向非均匀分布这些结果有望为形变调控合金的析出行为,提升合金力学性能提供理论指导.

关键词：镁合金变形时效硬化析出 HAADF-STEM

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

Mg-Zn基合金中非周期性析出相的原子尺度

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材料与冶金学报 2024年第1期23卷 65-72页

作者：姜景春李姗姗谢红波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 沈阳化工大学机械与动力工程学院沈阳110142

时效析出相的结构是主导合金强度提升的关键,因此从原子尺度认识析出相的结构出发,有助于更好地设计新合金.使用球差校正的高角环形暗场扫描透射电镜(HAADF-STEM)结合选区电子衍射(SAED)技术系统表征了峰时效Mg-Zn(-Al)系合金中的非周... 详细信息

时效析出相的结构是主导合金强度提升的关键,因此从原子尺度认识析出相的结构出发,有助于更好地设计新合金.使用球差校正的高角环形暗场扫描透射电镜(HAADF-STEM)结合选区电子衍射(SAED)技术系统表征了峰时效Mg-Zn(-Al)系合金中的非周期性析出相结构.研究结果表明,Mg-8Zn二元合金等温时效析出的棒状相是由72°菱形和72°等边六边形结构单元在(0001)α面上沿5个方向拼砌形成的,具有带Laves晶体特征的纳米畴结构.Al的添加可以显著改变Mg-Zn合金的时效析出行为,Mg-8Zn-4Al合金中析出了两种非周期性结构:一种是由36°菱形、72°菱形和72°等边六边形等结构单元自适应组装形成的块状析出相,其伪10次轴完全平行于[0001]α方向;还有一种是菱形的三维二十面体准晶相,其5次轴完全平行于[0001]α方向.这些原子尺度的相结构信息不仅可以增进人们对凝聚态物质结构的认识,还可为设计高强度的ZK,AZ系列镁合金提供理论依据.

关键词：镁合金时效析出非周期性结构准晶 Laves相 HAADF-STEM

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 alloys.Therefore, 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

退火温度对小变形拉拔Cu-0.08Ag合金组织性能的影响

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精密成形工程 2024年第6期16卷 164-172页

作者：朱亚丹田文斌齐林蔡佳任玉平李洪晓蒋敏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

目的在分析变形量为25%的小变形拉拔加工Cu-0.08Ag合金组织与性能的基础上,研究不同退火温度对小变形拉拔Cu-0.08Ag合金微观组织、力学性能和导电性能的影响规律,为Cu-Ag合金电磁线漆包工艺的制定提供参考。方法利用电子背散射衍射(EBSD... 详细信息

目的在分析变形量为25%的小变形拉拔加工Cu-0.08Ag合金组织与性能的基础上,研究不同退火温度对小变形拉拔Cu-0.08Ag合金微观组织、力学性能和导电性能的影响规律,为Cu-Ag合金电磁线漆包工艺的制定提供参考。方法利用电子背散射衍射(EBSD)技术对Cu-0.08Ag合金小变形拉拔及200~500℃不同温度退火1 h后的样品进行组织表征,结合显微硬度计、拉伸试验机和电阻计等手段对性能进行综合分析。结果经变形量为25%的小变形拉拔后,Cu-0.08Ag合金等轴晶组织部分晶粒沿变形方向被拉长,和取向占比均增大,应力集中分布在晶粒内,屈服强度提高了270%,而电导率仅下降了4.1%IACS。小变形拉拔Cu-0.08Ag合金的软化温度为350℃。与小变形拉拔态相比,在300℃及以下退火时显微组织和力学性能未发生明显变化,而电导率提升了2.9%IACS。在400℃及以上退火时,无畸变的等轴晶粒取代变形晶粒,并产生大量的退火孪晶,晶粒取向随机分布,力学性能和电导率与小变形拉拔前的相当。结论在300℃以下退火后,小变形拉拔Cu-0.08Ag合金在保持较高屈服强度的同时,其电导率也获得了提升,可获得强度和电导率良好的匹配关系。

关键词： Cu-Ag合金退火温度显微组织力学性能电导率

Molecular Mechanism of Rice Necrotic Lesion for Optimized Yield and Disease Resistance

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Rice science 2024年第3期31卷 285-299页

作者： HOU Xinyue WANG yuping QIAN Qian ren Deyong State Key Laboratory of Rice Biology and Breeding China National Rice Research InstituteHangzhou 310006China State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China Rice Research InstituteSichuan Agricultural UniversityChengdu 611130China

How to balance rice resistance and yield is an important issue in rice breeding.Plants with mutated necrotic lesion genes often have persistent broad-spectrum resistance,but this broad-spectrum resistance usually comes at the expense of yield.Currently,many necrotic lesion mutants in rice have been identified,and these genes are involved in disease resistance pathways.This review provides a detailed introduction to the characteristics,classification,and molecular mechanisms of necrotic lesion formation.Additionally,we review the molecular regulatory pathways of genes involved in rice disease resistance.Concurrently,we summarize the relationship between resistance and yield in rice using newly developed gene editing methods.We discuss a rational and precise breeding strategy to better utilize molecular design technology for breeding disease-resistant and high-yield rice varieties.

关键词： rice necrotic lesion regulation mechanism high yield high resistance

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 performances.However,the segregation of solutes/impurities remains elusive due to the diversity of interfacial structures.Here,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 GBs.The 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 calculations.These 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

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