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Effect of Alloyed mo on Mechanical Properties,Biocorrosion and Cytocompatibility of As-Cast Mg-Zn-Y-Mn Alloys

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Acta Metallurgica Sinica(English Letters) 2020年第4期33卷 500-513页

作者： Longlong Zhang Yatong Zhang Jinshan Zhang Rui Zhao Jiaxin Zhang Chunxiang Xu College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China 2 Shanxi Key Laboratory of Advanced Magnesium-based Materials Taiyuan 030024China

The influences of mo contents on mechanical properties,biocorrosion and cytocompatibility of as-cast Mg-6Zn-8.16Y-2.02Mn-xmo(x=0.0,0.1,0.3,0.5,0.7 wt%) alloys were firstly *** amount of mo was conducive to grain refinement and the formation of long-period stacking ordered structure with continuous distribution,which was advantageous to mechanical properties and corrosion ***-6Zn-8.16Y-2.02Mn-0.3mo exhibited the ultimate tensile strength of 265.0 MPa,elongation of 13.5% and the lowest weight loss rate in Hank’s ***,the cell toxicity cultured in 25% extract was evaluated and the alloy with 0.3 wt% mo exhibited the best ***,the alloy was expected to become a novel biodegradable implant material.

关键词： Magnesium alloy mo Corrosion Cytocompatibility Mechanical properties

Influence of Sn and mo on corrosion behavior of ferrite-pearlite steel in the simulated bottom plate environment of cargo oil tank

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Journal of Materials Science & Technology 2019年第5期35卷 799-811页

作者： Xuehui Hao Junhua Dong Xin Mu Jie Wei Changgang Wang Wei Ke Environmental Corrosion Centre Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Materials Science and Engineering Liaocheng University Liaocheng 252059 China

This work investigated the influence of Sn and mo on corrosion behavior of ferrite-pearlite steel in the simulated bottom plate environment of cargo oil tank. The results indicate that the corrosion rate of three ferrite-pearlite steels increased with extending the immersion time due to the continuous accumulation of the residual Fe3C. However, the addition of Sn or the combined addition of Sn and mo could reduce the corrosion rate of Sn containing steel and Sn-mo containing steel to 37.5% and 20% of that of carbon steel, respectively. moreover, the cathodic reaction of Sn containing steel and Sn-mo containing steel was always controlled by the charge transfer step during the whole immersion test, while that of carbon steel was gradually transformed into the diffusion-controlled process. These results were mainly related with the deposition of metallic Sn and mo on the steel surface. The metallic Sn and mo with uniform distribution restrained the galvanic effect through suppressing both the anodic dissolution of ferrite and cathodic hydrogen evolution reaction on the residual Fe3C.

关键词： Sn mo SEM EPMA EIS

Electronic structures and physical properties of pure Cr,mo and W

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中国有色金属学会会刊：英文版 2003年第5期13卷 1102-1107页

作者：谢佑卿邓永平刘心笔 School of Materials Science and Engineering Central South University Changsha 410083China

Using the one atom theory, the electronic structures of pure Cr, mo and W with bcc structure were determined respectively as: [Ar] (3d c) 3.32 (3d n) 2.26 (4s c) 0.25 (4s f) 0.17 , [Kr] (4d c) 4.23 (4d n) 1.48 (5s c) 0.02 (5s f) 0.27 and [Xe](5d c) 5.16 (6s c) 0.25 (6s f) 0.59 .The electronic structures of these metals with hcp and fcc structures and liquid state were also studied. According to their electronic structures, the relationship between the electronic structure and crystalline structure was explained qualitatively and the relationship between the difference of mechanical properties and transport properties of pure Cr, mo and W with bcc structure and their electronic structures was also explained qualitatively; the lattice constants, binding energy, potential curves, elasticities and the temperature dependence of the linear thermal expansion coefficient of bcc Cr, bcc mo and bcc W were calculated quantitatively.

关键词： Cr mo W 铬钼钨电子结构晶体结构结合能机械性能转变特性

Investigation of Nanocrystalline Fe-Cu-Nb-mo-Si-B Alloy

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Journal of Materials Science & Technology 1997年第5期13卷 425-430页

作者： Zhang, Yanzhong Shanghai Iron and Steel Research Institute Shanghai 200940 China

The soft magnetic properties are reported for newly-developed nanocrystalline Fe72.7Cu1Nb1.8-mo2Si13B9.5 and Fe73Cu1Nb1.5mo2Si13B9.5 The high frequency core losses of the new alloys are as follows: P-3/100K=473 kW.m(-3), P-2/200K=750 kW.m(-3), P-2/500K=3400 kW.m(-3), P-0.5/1000K 680 kW.m(-3), which are clearly lower than those of the early-developed Fe-Cu-Nb-Si-B nanocrystalline alloys and the superior power MnZn ferrite H-7c4 The dependences of core loss on frequency and amplitude magnetic flux density have been analysed. The temperature relations of initial susceptibility have been examined for as-quenched and different annealed Fe72.7Cu1Nb1.8mo2Si13B9.5 alloy acid interpreted by using the phenomenological theory.

关键词： mo Fe Si Cu

Three-phase interface induced charge modulation on moO_(2)/mo_(2)Ccarbon tube for enhanced hydrogen evolution

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Nano Research 2023年第4期16卷 4706-4714页

作者： Zhijie Zhang Jing Zhao Mengchen Wu Qinghua Lu Rui Liu Shanghai Key Laboratory of Development and Application for Metal-Functional Materials School of Materials Science and EngineeringTongji UniversityShanghai 201804China School of Chemical Science and Engineering Tongji UniversityShanghai 200092China

Exploring superior electrocatalyst for hydrogen evolution reaction(HER)is an urgent need for hydrogen production based on water *** redistribution of electrons and the increase of active sites through multi-interface designing of electrocatalyst are powerful strategies to improve the catalytic ***,a three-phase interface structure of N,P co-doped carbon tube embedded with moO_(2)/mo_(2)C(moO_(2)/mo_(2)C-CT)was fabricated via a cooperative polymerizing-embedding and pyrolysis *** function and X-ray photoelectron spectroscopy(XPS)verified that the interfacial charge was quantificationally modulated,achieving an intrinsically enhanced charge transfer by an induced built-in electric *** study of density functional theory(DFT)illustrated that triple-interface structure showed a lower energy for H*+H2O*than that of single-interface *** triple-interface moO_(2)/mo_(2)C-CT delivered a lower overpotential of 129 mV at 10 mA·cm^(−2)than that of either single-interface moO_(2)-CT or mo_(2)C-CT *** work may put forward an attractive approach for modulating electronic structure and provide insights into the understanding of triple-interface structure towards HER.

关键词： triple-interface mo carbon tube hydrogen evolution reaction density functional theory

Interaction of Mechanical and Electrochemical Factors duringCorrosion Fatigue of Fe-26Cr-1mo Stainless Steel in 1M H_2SO_4 Solution

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Journal of Materials Science & Technology 1995年第3期11卷 181-186页

作者： Jianqiu WANG Jin LI Ziyong ZHU and Wei KE (Corrosion Science Laboratory, Institute of Corrosion and Protection of Metals Chinese Academy of Sciences, Shenyang, 110015, China)Qishan ZANG and Zhongguang WANG (State Key Laboratory for Fatigue and Fracture CHINESE ACAD SCI INST MET RESSTATE KEY LAB FATIGUE & FRACTURE MATSHENYANG 110015PEOPLES R CHINA

The cyclic plastic straining electrode technique has been used to investigate the transient electrochemical behaviour of Fe-26Cr1mo stainless steel in 1M H2SO4 solution at a passive *** influence of plastic strain amplitude and plastic strain rate on the dissolution current response was analysed. The experimental results showed that the transient current was dependent on the competitive process of the surface film rupture and repassivation of the new surface. The high plastic strain amplitude and the high plastic strain rate caused a change of electrochemical activity of specimen surface. In the condition of low strain amplitude and strain rate, the characteristics of current response was mainly relative tp the process of new surface *** competition kinetics has been analysed through the comparison of plastic strain rate and repassivating rate

关键词： mo Cr Interaction of Mechanical and Electrochemical Factors duringCorrosion Fatigue of Fe-26Cr-1mo Stainless Steel in 1M H2SO4 Solution Fe SO

Precipitation of α_2 Phase in α+β Solution-Treated and Air-cooled Ti-Al-Sn-Zr-mo-Si-Nd Alloys

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Journal of Materials Science & Technology 2001年第3期17卷 315-317页

作者： Jun ZHANG and Dong LI Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China resent address: Shenyang University, Shenyang 110044, China E-mail: zhjun14@*** Chinese Acad Sci Met Res Inst Shenyang 110016 Peoples R China

A series of Ti-Al-Sn-Zr-mo-Si-Nd alloys with various content of Al were solution treated in α+β phase field and air-cooled. The precipitation of a2 phase in cooling was investigated by transmission electron microscopic analysis The precipitation characteristic of α2 phase was discussed. The precipitation of α2 phase would proceed by the nucleation and growth of α2 phase dependent on the diffusion of Al atoms. And a comparison on the difference of precipitation of α2 phase was carried out under the conditions of air-cooling and quenching in water. The investigation showed that the air-cooling and even quenching could supply enough time for the precipitation and growth of α2 phase when Al content reached a certain value even though far away from the stoichiometric composition of Ti3Al.

关键词： Al Precipitation of Phase in Solution-Treated and Air-cooled Ti-Al-Sn-Zr-mo-Si-Nd Alloys Ti mo Sn Zr Nd Si

Microstructure and mechanical properties of similar and dissimilar metal gas tungsten constricted arc welds:Maraging steel to 13-8 mo stainless steel

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Defence Technology（防务技术） 2019年第1期15卷 111-121页

作者： C.V.S.Murthy A.Gopala Krishna G.M.Reddy Defence Research and Development Laboratory Jawaharlal Nehru Technological University Defence Metallurgical Research Laboratory

Maraging steel (250) and 13-8 mo stainless steel plates were joined by gas tungsten constricted arc welding(GTCAW) process in similar and dissimilar metal combinations using 13-8 mo stainless steel filler wire. The similar and dissimilar metal welds made in solutionized condition were subjected to standard post weld hardening treatments direct ageing at 485 ℃, soaking for 31/2 hours followed by air cooling(ageing treatment of maraging steel) and direct ageing at 510 ℃, soaking for 4 h followed by air cooling(ageing treatment of 13-8 mo stainless steel). The joint characterization studies include microstructure examination, microhardness survey across the weldments and transverse weld tensile *** and dissimilar metal weldments responded to both the post weld ageing treatment. After post weld aging, increase in yield strength, UTS and slight reduction in % elongation of similar and dissimilar metal were observed. The observed tensile properties were correlated with microstructure and hardness distribution across the welds.

关键词： Maraging steel(250) 13-8 mo stainless steel Mechanical properties Microstructure

Strengthening FCC-CoCrFeMnNi high entropy alloys by mo addition

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Journal of Materials Science & Technology 2019年第4期35卷 578-583页

作者： Gang Qin Ruirun Chen Huiting Zheng Hongze Fang Liang Wang Yanqing Su Jingjie Guo Hengzhi Fu National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology

In order to strengthen the face-centered-cubic(FCC) type CoCrFeMnNi high entropy alloys(HEAs), different contents of mo(0–16 at.%, similarly hereinafter) were alloyed. Phase evolution, microstructure,mechanical properties and related mechanism of these HEAs were systematically studied. The results show that sigma phase is appeared with addition of mo, and the volume fraction of it increases gradually from 0 to 66% with increasing mo content. It is found that mo is enriched in sigma phase, which indicates that mo element is beneficial to form sigma phase. Compressive testing shows that the yield strength of the alloys increases gradually from 216 to 765 MPa, while the fracture strain decreases from 50%(no fracture) to 19% with increasing of mo. The alloy exhibits the best compressive performance when mo content reaches 11%, the yield strength, fracture strength and fracture strain are 547 MPa, 2672 MPa and44% respectively. The increased volume fraction of sigma phase plays an important role in improving the compressive strength of(CoCrFeMnNi)_(100-x)mo_xHEAs.

关键词： High-entropy alloys mo element Phase transition Mechanical properties Valence electron concentration