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Corrosion behavior of single-and poly-crystalline dual-phase TiAl–Ti3Al alloy in NaCl solution

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International Journal of Minerals,Metallurgy and Materials 2023年第4期30卷 689-696页

作者： Dongpeng wang Guang Chen anding wang Yuxin wang Yanxin Qiao Zhenguang Liu Zhixiang Qi Chain Tsuan Liu School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Centre for Advanced Structural Materials Department of Mechanical and Biomechanical EngineeringCity University of Hong KongHong Kong 999077China Engineering Research Center of Materials Behavior and Design Ministry of EducationNanjing University of Science and TechnologyNanjing 210094China School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808China

To clarify the correlation of single-crystalline structure with corrosion performance in high-strength TiAl alloys, electrochemical and surface characterization was performed by comparing Ti–45Al–8Nb dual-phase single crystals with their polycrystalline counterparts in NaCl solution. Polarization curves show a lower corrosion rate and a higher pitting potential of ~280 mV for the dual-phase single crystals. Electrochemical impedance spectroscopy and potentiostatic polarization plots revealed a higher impedance of the charge transfer through the compact passive film. Surface composition analysis indicated a compact film with more content of Nb, as twice as that in the film on the *** results reflect that the dual-phase Ti–45Al–8Nb single crystals possess a higher corrosion resistance in NaCl solution, compared with their polycrystalline counterpart, arising from a more homogeneous microstructure and composition distribution.

关键词： titanium alloy single crystal corrosion X-ray photoelectron spectroscopy

Ferromagnetic element microalloying and clustering effects in high B_s Fe-based amorphous alloys

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Journal of Materials Science & Technology 2018年第5期34卷 793-798页

作者： Pingbo Chen Tao Liu Fengyu Kong anding wang Chunyan Yu Gang wang Chuntao Chang Xinmin wang Laboratory for Microstructures Institute of Materials ScienceShanghai University Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of Sciences Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and EngineeringChinese Academy of Sciences School of Materials and Chemical Engineering Ningbo University of Technology College of Physics and Energy Shenzhen University

Fe83（Cox,Niy）（B11Si2P3C1）1-x,y/17（x,y=1–3）amorphous alloys with high saturation magnetic flux density（Bs）and excellent soft-magnetic properties were developed and then the microalloying and clustering effects were *** microalloying of Co and Ni improves the Bsfrom 1.65 T to 1.67–1.72 T and 1.66–1.68 T,*** Ni-doped alloys exhibit better soft-magnetic properties,containing a low coercivity（Hc） of about 5.0 A/m and a high Effective permeability（μe）of（8–10）×10^3,whereas the microalloying of Co leads to a deteriorative Hc of 5.0–13.0 A/m and a μeof（5–8）×10^***,microalloying of Ni can increase the ductile-brittle transition（DBT）temperature of the ribbons,while a totally opposite effect is found in the Co-doped *** formation of dense α-Fe（Co,Ni）clusters during annealing process is used to explain the distinct effects of Co and Ni microalloying on the magnetic properties and bending toughness.

关键词： Amorphous alloy Microalloying High Bs Domain structure Cluster

Development of soft magnetic amorphous alloys with distinctly high Fe content

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Science China(Physics,Mechanics & Astronomy) 2017年第10期60卷 45-50页

作者： PingBo Chen anding wang ChengLiang Zhao AiNa He Gang wang ChunTao Chang XinMin wang Chain-Tsuan Liu Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China Zhejiang Province Key Laboratory of Magnetic Materials andApplication Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China Laboratory for Mierostructures Institute of Materials Science Shanghai University Shanghai 200444 China Center for Advanced Structural Materials Department of Mechanical and Biomedical Engineering College of Science and Engineering City University of Hong Kong Hong Kong 999077 China

This paper reports on the preparation of Fe82.7-85.7Si2-4.9B9.2-11.2P1.***.2.7C0,8 soft magnetic amorphous alloys with a distinctly high Fe content of 93.5-95.5 wt.% by component design and composition adjustment. All alloys can be readily fabricated into completely amorphous ribbon samples with good surface quality by the single copper roller melt-spinning method. These alloys show good bending ductility and excellent magnetic properties after annealing, i.e., low coercivity （He） of 3.3-5.9 A/m, high permeability （μe） of 5000-10000 and high flux saturation density （Bs） of 1.63-1.66 T. The mechanism of the good glass forming ability （GFA）and soft-magnetic properties are explored. The amorphous alloys with the high Fe content comparable to that of the desired high Si alloy can be promising candidates for the potential application in electric devices.

关键词： metallic glasses alloy design annealing magnetic properties shear band

Heterostructured crystallization mechanism and its effect on enlarging the processing window of Fe-based nanocrystalline alloys

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Journal of Materials Science & Technology 2021年第9期68卷 53-60页

作者： Tao Liu Aina He Fengyu Kong anding wang Yaqiang Dong Hua Zhang Xinmin wang Hongwei Ni Yong Yang The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081China GAS Key Laboratory of Magnetic Materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081China Department of Materials Science and Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong Kong Special Administrative RegionChina

The harsh melt-spinning and annealing processes of high saturation magnetization nanocrystalline softmagnetic alloys are the biggest obstacles for their industrialization. Here, we proposed a novel strategy to enlarge the processing window by annealing the partially crystallized precursor ribbons via a heterostructured crystallization process. The heterostructured evolution of Fe_(84.75)Si_(2)B_(9)P_(3)_(C0.5)Cu_(0.75)(at.%)alloy ribbons with different spinning rate were studied in detail, to demonstrate the gradient nucleation and grain refinement mechanisms. The nanocrystalline alloys made with industrially acceptable spinning rate of 25-30 m/s and normal annealing process exhibit excellent magnetic properties and fine nanostructure. The small quenched-in crystals/clusters in the free surface of the low spinning rate ribbons will not grow to coarse grains, because of the competitive grain growth and shielding effect of metalloid elements rich interlayer with a high stability. Avoiding the precipitation of quenched-in coarse grains in precursor ribbons is thus a new criterion for the composition and process design, which is more convenient than the former one with respect to the homogenous crystallization mechanism, and enable us to produce high performance nanocrystalline soft-magnetic alloys. This strategy is also suitable for improving the compositional adjustability, impurity tolerance, and enlarging the window of melt temperature,which is an important reference for the future development of composition and process.

关键词： Nanocrystalline alloy Processing window Surface crystallization Soft-magnetic property Heterostructured crystallization

Microstructure,magnetic domain and dynamic loss of surface-textured Fe-based nanocrystalline alloy

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Journal of Materials Science & Technology 2022年第25期120卷 1-7页

作者： Aina He Jiawei Li Mingkun wang anding wang Yao Xiao Yaqiang Dong Hai Guo Rongrong Jiang Weixing Xia Lihong Dong Haidou wang Jianya Ge CAS Key Laboratory of Magnetic Materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China University of Chinese Academy of Sciences Beijing 100049China School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808China Ningbo Zhongke B Plus New Materials Technology Co. LtdNingbo 315201China National Key Lab for Remanufacturing Army Academy of Armored ForcesBeijing 100072China Jinhua Polytechnic Jinhua 321007China

Heterogeneous coarse surface crystallites induced in the industrial Fe-rich nanocrystalline alloy is an obstacle for high-frequency and high-power commercial ***,the phase,crystal orientation,nanostructure and magnetic domain evolution of the surface-crystallized Fe-rich alloy were systematically *** and inverse pole figures analysis confirms that the DOordered dendriticcrystallites bear-oriented fiber texture before and after annealing at the free surface,while ultrafine nanocrystals are randomly oriented in the interior and wheel surface after *** compared to zero magnetic-field-annealing,the transverse magnetic-field-annealing induces weakly oriented fiber texture and relatively uniform dendritic-crystallites at the surface,and uniform anisotropy in the interior and surface,which promotes smooth wall motion at the surface and magnetization rotation in the *** synergetic effect reduces the excess loss and leads reduction in dynamic loss at 1.0 T and10 kHz by 36%.

关键词： Nanocrystalline alloy Crystallization Texture Magnetic domain Dynamic loss

Effect of Ni addition on the glass-forming ability and soft-magnetic properties of FeNiBPNb metallic glasses

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Chinese Science Bulletin 2011年第36期56卷 3932-3936页

作者： wang anding ZHANG MingXiao ZHANG JianHua MEN He SHEN BaoLong PANG ShuJie ZHANG Tao Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology ＆ Engineering Chinese Academy of Sciences Ningbo 315201 China School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

The effect of Ni addition on the glass-forming ability (GFA) and soft-magnetic properties of an (Fe1-xNix)75.5B14.5P7Nb3 (x=0-0.6) alloy system were investigated. We found that the addition of Ni was effective in allowing the alloy to approach a eutectic point as well as increasing the thermal stability of the supercooled liquid. By increasing the amount of Ni,the supercooled liquid region (ΔTx),the reduced glass transition temperature Trg (Tg/Tl) and the Y parameter [Tx/(Tg+Tl)] increased from 49 to 75 K,0.540 to 0.594 and 0.373 to 0.405,respectively. As a result,novel (Fe1-xNix)75.5B14.5P7Nb3 bulk metallic glass (BMG) rods with a maximum diameter of 1 mm were synthesized with a composition of x=0.5 and x=0.6 by copper mold casting. These metallic glasses have a moderate saturation magnetization of 0.37-1.20 T with good soft-magnetic properties,i.e. a low coercivity of 1.4-3.3 A/m and a high effective permeability of 13100-20900 at 1 kHz. The simultaneous achievement of a high GFA and good soft-magnetic properties for the FeNi-based alloy system is promising for the future development of BMGs.

关键词：大块金属玻璃玻璃形成能力软磁性能玻璃化转变温度合金系统饱和磁化强度过冷液相区有效渗透率

Changchun's Films and Cars

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China Today 1996年第12期45卷 21-24页

作者： $$$$GUO anding and wang ZHIREN

Ｃｈａｎｇｃｈｕｎ＇ｓＦｉｌｍｓａｎｄＣａｒｓ￥ＧＵＯＡＮＤＩＮＧａｎｄＷＡＮＧＺＨＩＲＥＮＢｙｓｔａｆｆｒｅｐｏｒｔｅｒｓＧＵＯＡＮＤＩＮＧａｎｄＷＡＮＧＺＨＩＲＥＮＣＨＡＮＧＣＨＵＮＩＳｂｅｓｔｋｎｏｗｎｆｏｒｉ... 详细信息

Ｃｈａｎｇｃｈｕｎ＇ｓＦｉｌｍｓａｎｄＣａｒｓ￥ＧＵＯＡＮＤＩＮＧａｎｄＷＡＮＧＺＨＩＲＥＮＢｙｓｔａｆｆｒｅｐｏｒｔｅｒｓＧＵＯＡＮＤＩＮＧａｎｄＷＡＮＧＺＨＩＲＥＮＣＨＡＮＧＣＨＵＮＩＳｂｅｓｔｋｎｏｗｎｆｏｒｉｔｓｆｉｌｍｓａｎｄａｕｔｏｍｏｂ...

关键词： Changchun

A plastic FeNi-based bulk metallic glass and its deformation behavior

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Journal of Materials Science & Technology 2021年第17期76卷 20-32页

作者： Jing Zhou Qianqian wang Qiaoshi Zeng Kuibo Yin ing wang Junhua Luan Litao Sun Baolong Shen School of Materials Science and Engineering Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjing211189China SEU-FEI Nano-Pico Center Key Laboratory ofMEMS of Ministry of EducationSoutheast UniversityNanjing210096China Center for Advanced Structural Materials Department of Mechanical and Biomedical EngineeringCollege of Science and EngineeringCity University of Hong KongKowloonHong KongChina Institute of Massive Amorphous Metal Science China University of Mining and TechnologyXuzhou221116China

The strength and plasticity of Fe_(39)Ni_(39)B_(12.82)Si_(2.75)Nb_(2.3)P_(4.13)bulk metallic glass(BMG)are improved simultaneously by modulating atomic-scale structure through fluxing *** compression strength increases from 3074 to 4220 MPa,and the plastic strain is enlarged from 10.7%to more than 50%.The increased mechanical properties of the fluxed Fe Ni BSi Nb P BMG originate from the optimization of atomic-scale *** icosahedral-like clusters(ILCs)and crystal-like clusters(CLCs)are found in this Fe Ni-based BMG with fluxing treatment,and the ILCs are usually surrounded by ***,phase separation and a sandwich-like heterogeneous structure of SB are also observed during deformation,indicating the multiscale deformation mechanism and a stable shear-band *** unique"ILC surrounded by CLCs"structure and phase separation lead to a stable plastic deformation process with strong interactions of multiple shear bands,thereby the improved plasticity and *** work provides useful guidelines to develop strong and plastic Fe-based BMGs from a structural aspect.

关键词： FeNi-based BMG Plasticity Strength Structural heterogeneity Shear bands

基于求根MUSIC算法的低复杂度OFDMA频偏盲估计

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江苏大学学报（自然科学版） 2010年第6期31卷 700-704页

作者：王安定李式巨浙江大学信息与电子工程学系浙江杭州310027

为了解决OFDMA系统频率同步困难的问题,针对子载波交织分配的OFDMA上行链路提出了一种基于多项式求根的多用户载波频偏盲估计算法.首先对接收信号的协方差矩阵进行特征值分解,并利用噪声子空间的特征向量构造一个多项式,然后求解最接近... 详细信息

为了解决OFDMA系统频率同步困难的问题,针对子载波交织分配的OFDMA上行链路提出了一种基于多项式求根的多用户载波频偏盲估计算法.首先对接收信号的协方差矩阵进行特征值分解,并利用噪声子空间的特征向量构造一个多项式,然后求解最接近于单位圆的K个根来获得各个载波频偏.此算法的优点是能够在一个OFDMA符号块内同时估计出所有用户的载波频偏而无需信道状态、训练序列和导频等先验信息,同时在低信噪比下也具有良好的准确性.通过仿真表明,相对于一般的谱峰搜索方法,算法不仅减少了噪声对频偏估计的影响,而且有着更低的计算复杂度和更高的分辨率.

关键词：正交频分多址接入频率同步载波频偏估计求根MUSIC算法特征值分解