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Ductile Fe-based amorphous alloys with high iron content

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International Journal of Minerals,Metallurgy and Materials 2010年第2期17卷 199-203页

作者： Feng-juan Liu Tao Zhang Shu-jie Pang ke-fu yao The key Laboratory for Advanced Materials Processing Technology Department of Mechanical Engineering Tsinghua University Beijing 100084 China Department of Materials Science and Engineering Beihang University Beijing 100191 China

Fe-based amorphous alloys with high iron content of 76at%-80at%were synthesized in the Fe-Mo-Si-P-C-B alloy system by the single roller melt-spinning *** amorphous ribbons exhibit high Vickers microhardness and good ductility,which can be indented and bent 180°without breaking.A number of shear bands could be observed around the indents and the bending *** on the magnetic properties of the amorphous alloys show that they possess high saturation magnetizations of 1.34-1.6 T,which increases with the increase of iron *** core losses of these Fe-based amorphous alloys at various magnetic inductions were tested and found to be significantly dependent on their *** Fe-Mo-Si-P-C-B amorphous alloys with excellent mechanical properties and soft magnetic properties have promising potential in functional applications.

关键词： bulk metallic glass amorphous alloys ductility soft magnetic properties melt-spinning

Recent progress in high-entropy metallic glasses

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Journal of Materials Science & Technology 2023年第30期161卷 50-62页

作者： Hengwei Luan keran Li Lingxiang Shi Wei Zhao Hengtong Bu Pan Gong ke-fu yao Wuzhen Laboratory Tongxiang 314500China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China State key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Department of Physics City University of Hong KongTat Chee AvenueKowloon999077Hong KongChina e City University of Hong Kong(Dongguan) Dongguan 523000China

High-entropy metallic glass(HEMG)is a new type of metallic material with high-entropy alloy-like com-position and amorphous structure,which render HEMGs unusual glass formation behaviors and unique *** recent years,fast research progress has been witnessed on the HEMGs,and thus a sys-tematic review is *** this review,we first introduce the concept of the HEMGs and summarize the developed ***,the glass-forming ability of the HEMGs is discussed,and the general rules are *** on the thermal stability of HEMGs,the effect of entropy on the energy states of HEMGs and the crystallization behavior of HEMGs are ***,the mechanical,magnetic,cat-alytic and other properties of HEMGs are presented,and the advantages and disadvantages of HEMGs are *** review can function as a quick guideline for overviewing the HEMG field.

关键词： High-entropy metallic glasses Glass-forming ability Thermal stability Mechanical property functional property

A room-temperature magnetic semiconductor from a Co-Fe-Nb-B metallic glass

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Science China(Physics,Mechanics & Astronomy) 2023年第4期66卷 94-99页

作者： Yu-Zhang Jiao Dmitry VLouzguine-Luzgin ke-fu yao Zheng-Jun Zhang Na Chen Laboratory for Advanced Materials Processing Technology(MOE) State Key Laboratory of New Ceramics and Fine ProcessingSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China key Laboratory for Advanced Materials(MOE) Schoolof Materials Science and EngineeringTsinghua UniversityBeijing 100084China Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversitySendai 980-8577Japan Mathematics for Advanced Materials-OIL National Institute of Advanced Industrial Science and Technology(AIST)Sendai 980-8577Japan

Magnetic semiconductors with Curie temperatures higher than room temperature show potential for developing spintronic devices with combined data processing and storage functions for next-generation computing *** this study,we present an n-type Co_(19.8)Fe_(8.6)Nb_(4.3)B_(6.0)O_(61.3) magnetic semiconductor with a high Curie temperature of~559 *** magnetic semiconductor has a room-temperature resistivity of~2.10×10^(4)Ωcm and a saturation magnetization of~76 emu/cm^(3).The n-type Co_(19.8)Fe_(8.6)Nb_(4.3)B_(6.0)O_(61.3)magnetic semiconductor was deposited on p-type silicon to form a heterojunction,exhibiting a rectifying *** results provide the design principles for discovering high Curie temperature magnetic semiconductors with determined conduction types,which would play an essential role in realizing nonvolatile spin-based transistors that break free from the confines of currently established Si-based information technology.

关键词： magnetic semiconductor ferromagnetic metallic glass high Curie temperature

Fe-based multi-phase nanocrystalline ribbons with hierarchically flowerlike structured metal oxides after modified by Orange II for Cr^VI absorption

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Journal of Iron and Steel Research International 2018年第6期25卷 608-613页

作者： Shuang-qin Chen Liang-zheng Dong ke-zhen Hui Zhen Peng Zhun Li Zhi-Chao Lu Yang Shao ke-fu yao School of Materials Science and Engineering TsinghuaUniversity Beijing 100084 China School of Materials Science and Engineering JiangsuUniversity Zhenjiang 212013 Jiangsu China China Iron & Steel Research Institute Group Beijing 100081China

Three-dimensional flowerlike nanostructured metal oxides attached on the surfaces of Fe-based multi-phase nanocrys- talline ribbons （Fe-MNRs） were prepared by a simple way （through immersing the Fe-MNRs in Orange II solution）. It has been found that the as-prepared Fe-MNRs with 3D flowerlike nanostructures （Fe-MNRs ＋ FNs） exhibit good absorption property for a typical heavy metal ion （Cr^VI） in wastewater, while Fe-MNRs do not possess such properties. The Fe-MNRs ＋ FNs could remove 99% CrvI ions from the solution in 40 min, and this adsorption property can be attributed to the ion exchange between Cr^VI and surface hydroxyl groups （O-H） of 3D flowerlike nanostructures. The present result suggests that the Fe-MNRs ＋ FNs, prepared by facile way, possess great potentials in removing heavy metallic ions in wastewater.

关键词： Fe-based multi-phase nanocrystalline ribbon Flowerlike nanostructure α-FeO(OH) Hexavalent chromium Wastewater treatment

Centimeter-sized Ti-based bulk metallic glass with high specific strength

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Progress in Natural Science:Materials International 2012年第5期22卷 401-406页

作者： Pan Gong,ke-fu yao,Xin Wang,Yang Shao Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China Department of Mechanical Engineering Tsinghua University Beijing 100084 China

Based on the quaternary Ti41Zr25Be29Al5 glassy alloy with a critical diameter of 7 mm reported not long ago,an obvious enhancement of glass-forming ability(GFA) has been realized in this alloy by the addition of Cu element.A series of(Ti41Zr25Be29Al5)100-xCux(x=0,2,5,7,9,11 at%) glassy alloys have been developed and some of them can be cast into one-centimeter diameter fully glassy rods by copper mold suction *** has been found that Cu addition could stabilize the liquid phase and suppress the crystallization,resulting in improvement of the GFA of the *** addition of Cu also increases the compressive strength of the alloy and the(Ti41Zr25Be29Al5)91Cu9 glassy alloy possesses a specific strength(defined as yield strength/density) of 4.13×105Nm/kg,which is much higher than most other reported centimeter-sized bulk metallic *** present result suggests that the newly developed(Ti41Zr25Be29Al5)91Cu9 glassy alloy is a good candidate for structural applications because of its good glass-forming ability and mechanical properties.

关键词： Metallic glasses Ti alloy Glass-forming ability Mechanical properties

Microstructure and mechanical properties of lightweight AlCrTiV_(0.5)Cu_(x) high-entropy alloys

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Rare Metals 2022年第6期41卷 2016-2020页

作者： Zhen Peng Zai-Bin Luo Bao-Wei Li Jin-Feng Li Heng-Wei Luan Jia-Lun Gu Yuan Wu ke-fu yao School of Materials Science and Engineering Jiangsu Uni versityZhenjiang 212013China Institute of Materials China Academy of Engineering PhysicsMianyang 621908China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China State key Laboratory for Advanced Metals and Materials.University of Science and Technology Beijing Beijing 100083China

High-entropy alloys(HEAs)are an emerging and rapidly developing family of alloys with appealing properties such as lightweight HEAs with excellent mechanical *** this study,to obtain lightweight HEAs with exceptional hardness,we prepared AlCrTiV_(0.5)Cu_(x)(x=0,0.2,0.4,0.6,0.8 and 1.0,denoted as Cu_(0),Cu_(0.2),Cu_(0.4),Cu_(0.6),Cu_(0.8) and Cu_(1.0) alloys,respectively)HEAs and analyzed their microstructure and hardness.

关键词： alloys properties. Microstructure

Excellent long-term reactivity of inhomogeneous nanoscale Fe-based metallic glass in wastewater purification

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Science China Materials 2020年第3期63卷 453-466页

作者： Shuang-Qin Chen ke-Zhen Hui Liang-Zheng Dong Zhun Li Qing-hua Zhang Lin Gu Wei Zhao Si Lan Yubin ke Yang Shao Horst Hahn ke-fu yao School of Material Science and Engineering Tsinghua UniversityBeijing 100084China Herbert Gleiter Institute of Nanoscience Nanjing University of Science and TechnologyNanjing 210094China China Iron&Steel Research Institute Group Beijing 100081China Beijing Laboratory for Electron Microscopy Institute of PhysicsCASBeijing 100190China Institute of Nanotechnology Karlsruhe Institute of Technology76344 Eggenstein-LeopoldshafenGermany China Spallation Neutron Source Institute of High Energy PhysicsChinese Academy of SciencesDongguan 523803China

Metallic glasses(MGs)have attracted great attention in wastewater treatment because of their high reactivity arising from amorphous structure,large residual stress and high density of low coordination ***,the reactivity of MGs would gradually slow down with time due to the passivation of active sites by corrosion products,resulting in limited long-term reactivity,which is also an unsolved key issue for established crystalline zero valent iron(ZVI)***,such problems are successfully overcome by introducing nanoscale chemical inhomogeneities in Fe-based MG(Fe-MGI),which apparently contributes to local galvanic cell effect and accelerates electron transfer during degradation *** importantly,the selective depletion of Fe0 causes local volume shrinkage and crack formation,leading to self-peeling of precipitated corrosion products and reacted *** fresh low coordination sites could be continuously provided,counteracting the mass transport and reactivity deteriorating ***,Fe-MGI demonstrates excellent long-term reactivity and self-refreshing properties even in neutral *** present results provide not only a new candidate but also a new route of designing ZVI materials for wastewater treatment.

关键词： Fe-based metallic glass inhomogeneity self-refreshing wastewater treatment catalysis

Anomalous low-temperature transport property of oxygen containing high-entropy Ti-Zr-Hf-Cu-Ni metallic glass thin films

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Science China Materials 2019年第6期62卷 907-912页

作者： Shaofan Zhao Pengfei Wang Xiang Cheng Yingqi Zhang Zhuoqun Wen Qi Zhang ke-fu yao Na Chen Wei-Hua Wang Qian Xuesen Laboratory of Space Technology School of Materials Science and Engineering Tsinghua University Institute of Physics Chinese Academy of Sciences

Lacking structural periodicity of long-range order induces unusual physical properties in metallic glasses (MGs). Specifically, the low-temperature electron transport behavior of MGs has triggered fundamental interest in solid-state physics. MGs exist as strong scattering systems since their electron mean free paths are com? parable to the average interatomic distances . The temperature coefficient of resistivity (TCR, defined as a =(l/p)(8p/8T)) in these systems can be positive or negative depending on their Fermi level positions .

关键词：非晶合金薄膜输运行为高熵低温掺氧异常诱导电子自旋

The influence of stress and strain on kinetics of bainite transformation

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Journal of Shanghai Jiaotong university(Science) 2000年第1期5卷 225-229页

作者： ke-fu yao, Chuncheng Liu, Wei Shi and Zhuang Liu Department of Mechanical Engineering Tsinghua University, Beijing 100084, P.R. China

The influence of stress and strain on the kinetics and transformation plasticity of bainite transformation has been studied using a 26Cr2Ni4MoV steel by thermal simulation experimental method. It has been found that as applied stress increases the maximum volume fraction of bainite increases for applied stress lower than the yield stress but decreases for applied stress higher than the yield stress. This is believed to be related with the strengthening of parent phase due to pre-deformation. Experimental results indicate that applied stress accelerates bainite transformation. When applied stress is lower than the yield stress, the parameter of transformation plasticity increases with applied stress while it becomes a constant for stress larger than yield stress.

关键词： stress and strain transformation kinetics transformation plasticity bainite.