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Break the strength-ductility trade-off in a transformation-induced plasticity high-entropy alloy reinforced with precipitation strengthening

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Journal of Materials Science & Technology 2022年第13期108卷 125-132页

作者： Dong Huang yanxin zhuang Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang110819China

Transformation-induced plasticity(TRIP)endows material with continuous work hardening ability,which is considered as a powerful weapon to break the strength-ductility ***,FCC based alloys with TRIP effect can not get rid of the“soft”feature of the structure entirely,resulting in insufficient yield ***,a Co_(x)Cr_(25)(AlFeNi)_(75-x) high-entropy alloy is *** phase is used as strengthening component to improve yield strength,while TRIP effect ensures *** with the previous TRIP high-entropy alloy,its yield strength is nearly doubled,and the uniform elongation is more than 55%at room ***,the corresponding multiphase microstructure evolution and deformation mechanisms are ***,stacking faults andΣ3 twin boundaries are confirmed to be the nucleation sites of HCP phase by *** composition design and proper heat treatment process make it a perfect combination of precipitation strengthening and transformationinduced plasticity,and thus guide design in the high-performance alloy.

关键词： High-entropy alloys Transformation-induced plasticity Precipitation strengthening Nucleation site HAADF-STEM

Effect of Ni on the formation and thermal behavior of NdAlCo metallic glasses

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Acta Metallurgica Sinica(English Letters) 2011年第4期24卷 281-286页

作者： yanxin zhuang Jun CHEN Puwei WANG JichengHE Key Laboratory of Electromagnetic Processing of Materials (Ministry of EdUcation) NortheasternUniversity Shenyang 110819 China

Nd60All0Co30-xNix （x=0, 5, 10 and 15 at. pct） metallic glasses have been prepared using single-spinner and suck-casting method, and characterized using X-ray diffrac- tion （XRD） and non-isothermal differential scanning calorimetric technique. It has been found that the Mloy with 15 at. pct Ni has the strongest glass forming ability, and can be fabricated to a rod with 5 mm in diameter using suck-casting. The addition of Ni has an obvious effect on the thermal behavior of the metallic glasses, especially on the position of the second and third crystallization peaks. The crystallization ki- netics and activation energies of the four metallic glasses have been elaborated using the Kissinger equation. The continuous heating transformation curves of the T~ and Tpl have been constructed by applying the extension of the Vogel-Fulcher-Tammann （VFT） nonlinear equations, which are derived from the experimental data in the heat- ing rate range of 5-80 K/min. The effect of Ni on the formation and thermal stability of the Nd-based metallic glasses has been discussed.

关键词： Nd-based metallic glass Nickel Glass forming ability Thermalstability

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三氧化二铋碳热还原反应的动力学

有色金属（冶炼部分） 2024年第1期 33-40页

作者：张鑫阳邢鹏飞庄艳歆都兴红王帅东北大学冶金学院沈阳110819 东北大学材料科学与工程学院沈阳110819

由于铋元素密度较大,在工业硅碳热还原冶炼过程中容易沉淀,导致冶炼所得工业硅中杂质分布不均,质量下降,因此研究铋在碳热还原反应中的动力学行为,为工业硅冶炼中铋含量的控制提供理论指导具有重要意义。通过热重分析方法研究了不同碳... 详细信息

由于铋元素密度较大,在工业硅碳热还原冶炼过程中容易沉淀,导致冶炼所得工业硅中杂质分布不均,质量下降,因此研究铋在碳热还原反应中的动力学行为,为工业硅冶炼中铋含量的控制提供理论指导具有重要意义。通过热重分析方法研究了不同碳质还原剂对铋氧化物(三氧化二铋)碳热还原的影响。结果表明,石油焦相较于石墨活性更高,石油焦作还原剂具有更好的还原性能。对不同温度下三氧化二铋还原熔炼产物进行了物相分析,其还原反应产物物相转变顺序为:Bi_(2)O_(3)→Bi_(2)O_(2.5)→Bi。通过热重分析法研究了不同升温速率下三氧化二铋碳热还原反应动力学,应用等转化率法、Kissinger法和Satava-Sesták法进行动力学分析,得到三氧化二铋碳热还原反应平均表观活化能E_(0)=142.41 kJ/mol,指前因子A_(0)=2.96×10^(9) s^(-1);反应机理属于相边界反应,对应的动力学方程微分形式为3(1—α)^(2/3)。

关键词：三氧化二铋碳热还原动力学活化能

Effect of Co element on microstructure and mechanical properties of FeCo_x NiCuAl alloys

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Acta Metallurgica Sinica(English Letters) 2012年第2期25卷 124-130页

作者： yanxin zhuang Wenjie LIU Pengfei XING Fei WANG Jicheng HE Key Laboratory of Electromagnetic Processing of Materials （Ministry of Education） Northeastern University Shenyang 110819 China School of-Materials and Metallurgy Northeastern University Shenyang 110819 China

FeCoxNiCuAl （x values in molar ratio, x=0.2, 0.5, 1, 1.5, 2 and 3） alloys were pre- pared using a suck-casting method. The effect of Co element on phase constituents, microstructure and mechanical properties of the FeCox NiCuA1 alloys was investigated using X-ray diffraction, scanning electron microscopy, optical microscopy and com- pressive tests. It was found that the Co addition has a significant influence on the structure and properties of the FeCo^NiCuA1 alloys. The alloys have typical den- drite microstructure, and are composed of a simple fcc structure and bcc structure. The addition of Co promotes the formation of fcc phase in the alloys, retards the compressive strength and hardness of the alloys, and enhances the plasticity of the alloys.

关键词： High entropy alloy Co element Microstructure Properties

On the modification of hypereutectic Al-Si alloys using rare earth Er

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Acta Metallurgica Sinica(English Letters) 2010年第5期23卷 327-333页

作者： Pengfei XING Bo GAO yanxin zhuang Kaihua LIU Ganfeng TU School of Materials and Metallurgy Northeastern University Shenyang 110819 China Key Laboratory of Electromagnetic Processing of Materials Northeastern University Shenyang 110819 China

Hypereutectic Al-17.5Si （wt pct） and Al-25Si （wt pct） alloys with various content of rare earth Er were prepared by conventional casting technique. The effect of Er on the microstructure and properties of the hypereutectic Al-Si alloys was investigated using optical microscopy, scanning electron microscopy as well as friction and wear tests. It was found that optimal amount of Er exists in modifying the hypereutectic Al-Si alloys. An appropriate addition of Er improved the anti-wear properties, and reduced the friction coefficient of the hypereutectic Al-Si alloys studied. The primary silicon crystals in the hypereutectic Al-Si alloys were refined with the suitable addition of Er element. The modification mechanism was also discussed in this paper.

关键词： Rare earth Er Al-Si alloy Microstructure Modification Rare earth Er A1-Si alloy Microstructure Modification

Crystallization of Pd_40Cu_30Ni_10P_20 bulk metallic glass with and without pressure

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Journal of University of Science and Technology Beijing 2007年第4期14卷 356-360页

作者： Bin Yang Jianzhong Jiang yanxin zhuang Karel Saksl Guoliang Chen State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China International Centre for Materials Physics Chinese Academy of Sciences Shenyang 110016 China Department of Physics Building 307 Technical University of Denmark DK-2800 Lyngby Denmark

The glass-transition behavior of Pd40Cu30Ni10P20 bulk metallic glass was investigated by differential scanning calorimetry （DSC） and X-ray powder diffraction （XRD）. The effect of pressure on the crystallization behavior of Pd40Cu30Ni10P20 bulk glass was studied by in situ high-pressure and high-temperature X-ray powder diffraction using synchrotron radiation. Phase analyses show at least six crystalline phases in the crystallized sample, namely, monoclinic, tetragonal CuaPd-like, rhombohedral, fcc-Ni2Pd2P, fcc-（Ni, Pd） solid solution, and body-centered tetragonal （bct） NiaP-like phases. The onset crystallization temperature increases with pressure having a slope of 1 1 K/GPa in the range of 0 to 4 GPa. The results are attributed to the competing process between the thermodynamic potential barrier and the diffusion activation energy under pressure.

关键词： crystallization metallic glass supercooled liquid pressure

Kinetic mechanism of copper extraction from methylchlorosilane slurry residue using hydrogen peroxide as oxidant

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中国化学工程学报:英文版 2023年第8期60卷 228-234页

作者： Xiaolin Guo Zhaoyang Zhang Pengfei Xing Shuai Wang Yibing Guo yanxin zhuang School of Metallurgy Northeastern UniversityShenyang 110819China Ecological Environmental Monitoring Center of Liaoning Province Shenyang 110819China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China

Copper was extracted from methylchlorosilane slurry residue by a direct hydrogen peroxide leaching method.A number of experimental parameters were analyzed to determine the extraction efficiency of *** extraction efficiency of copper reached 98.5%under the optimal leaching conditions,such as the hydrogen peroxide concentration of 1.875 mol·L^(-1),the leaching temperature of 323 K,the liquid–solid ratio of 20 ml·g^(-1),and the stirring speed of 300 r·min^(-1).The leaching kinetics of the copper extraction process was then described by the shrinking core *** were two *** first stage was controlled by chemical reactions,while the second stage was controlled by interface transfer and product layer *** activation energy and kinetic control equations were determined,as well as an explanation of the leaching mechanism of copper extraction based on kinetic analysis and materials *** resources can be recovered from the methylchlorosilane slurry residue efficiently and inexpensively with the methods used in this study.

关键词： Methylchlorosilane slurry residue Copper extraction Hydrogen peroxide Kinetics

Designing new work-hardenable ductile Ti-based multilayered bulk metallic glass composites with ex-situ and in-situ hybrid strategy

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Journal of Materials Science & Technology 2020年第15期47卷 128-138页

作者： Shifeng Lin Zhengwang Zhu Shaofan Ge Long Zhang Dingming Liu yanxin zhuang Huameng Fu Hong Li Aimin Wang Haifeng Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110819China School of Material Science and Engineering Northeastern UniversityShenyang 110819China

To overcome the trade-off between the devisable micro structure and the excellent tensile ductility of bulk metallic glass composites(BMGCs),a novel ex-situ and in-situ hybrid strategy is successfully proposed to design a series of the work-hardenable ductile Ti-based multilayered BMGCs(ML-BMGCs).The asprepared ML-BMGCs,consisting of α-phases,β-phases and amorphous phases,exhibit a controllable multilayered structure of the Ti layers and the amorphous layers with alternative *** size and volume fraction of the crystalline phases are tuned by Nb *** is found that the ML-BMGCs possess a suitable size and volume fraction of the crystalline phases when Nb microalloying content are5%(at.) or 8%(at.),and they obtain an optimum combination of the specific strength of 243 MPa g kg-1 or 216 MPa g kg-1,and tensile plasticity of 4.33%±0.1 % or 5.10%±0.1%.The deformation mechanism of the as-prepared ML-BMGCs during tension is also *** ex-situ Ti layers and in-situ dendrites together effectively serve as absorbers to suppress the propagation of shear bands and multiply shear *** the defo rmation of ex-situ α-Ti phases by dislocation slip and the transformation from in-situ metastable β-Ti phase to orthorhombic α-Ti during tension impart significant work-hardening capability to the ML-B *** present study provides a guidance of developing novel high-performance BMGCs with a controllable micro structure.

关键词： Hybrid Strategy ML-BMGCs Tensile property Deformation Mechanism

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碳化硼的制备及其在电池储能和核能中的应用

铁合金 2024年第1期55卷 31-35页

作者：杜文轩王帅孙瑶庄艳歆邢鹏飞东北大学材料电磁过程研究教育部重点实验室辽宁沈阳110819 东北大学冶金学院辽宁沈阳10819 东北大学材料科学与工程学院辽宁沈阳110819

作为硬度值第三的陶瓷材料,碳化硼(B_(4)C)具有硬度高、密度低、物理化学稳定性好及中子吸收性好等特性,使其在轻型装甲、涂层材料、研磨介质、电催化材料及控制核裂变等方面得到广泛应用。碳化硼具有极其稳定的共价键,是制备燃料电池... 详细信息

作为硬度值第三的陶瓷材料,碳化硼(B_(4)C)具有硬度高、密度低、物理化学稳定性好及中子吸收性好等特性,使其在轻型装甲、涂层材料、研磨介质、电催化材料及控制核裂变等方面得到广泛应用。碳化硼具有极其稳定的共价键,是制备燃料电池催化剂的重要基础材料。铝基碳化硼复合材料是综合结构和功能的中子吸收材料,其中子屏蔽性能、力学性能和耐腐蚀性能等方面的应用对于我国核电站建设和安全运行具有重要的科学意义。

关键词：碳化硼制备电池储能核能