alloy

摘要： The advancement and growth of nanotechnology lead to realizing new and novel multi-metallic nanostructures with well-defined sizes and morphology,resulting in an improvement in their performance in various catalytic applications.The trimetallic nanostructured materials are synthesized and designed in different architectures for energy conversion electrocatalysis.The as-synthesized trimetallic nanostructures have found unique physiochemical properties due to the synergistic combination of the three different metals in their structures.A vast array of approaches such as hydrothermal,solvothermal,seedgrowth,galvanic replacement reaction,biological,and other methods are employed to synthesize the trimetallic nanostructures.Noteworthy,the trimetallic nanostructures showed better performance and durability in the electrocatalytic fuel cells.In the present review,we provide a comprehensive overview of the recent strategies employed for synthesizing trimetallic nanostructures and their energy-related applications.With a particular focus on hydrogen evolution,alcohol oxidations,oxygen evolution,and others,we highlight the latest achievements in the field.

摘要： Electrocatalytic oxygen reduction reaction(ORR)and hydrogen evolution reaction(HER)in acidic media are vital for the applications of renewable energy electrolyzers.However,the low mass activity of noble Pt urgently needs to be improved due to the strong binding energetics of oxygen species(*O)with Pt sites.Here we report fine PtxSr alloy(-2 nm)supported on N-doped carb on(NC)pyrolyzing from ZIF-8 as bifunctional electrocatalysts toward ORR and HER in acidic media.The representative Pt_(2)Sr/NC exhibits an onset potential of 0.94 V vs.RHE and half-wave potential of 0.84 V toward ORR,and a low over-potential of 27 mV(10 mA cm^(-2))toward HER,respectively.Significantly,the mass activities of Pt_(2)Sr/NC are 6.2 and 2.6 times higher than that of Pt/C toward ORR(at 0.9 V)and HER(at-30 mV),respectively.Simultaneously,Pt_(2)Sr/NC possesses a retention rate of 90.97%toward acidic ORR after 35000 s of continuous operation.Through density functional theory(DFT)calculations and X-ray photoelectron spectroscopy analysis,the incorporation of Sr into Pt forming Pt_(2)Sr alloy redistributes the electronic structures of Pt-Pt bonds,changing the rate-determining step for the ORR on Pt sites from the formation of*OH from*O to the generation of*OOH along with decreasing the energy barrier,which is also confirmed by the downshift of d band center.Meanwhile,the downshift of d band center also leads to the optimization of the adsorption energy(H*)with Pt,significantly improving Pt_(2)Sr/NC toward HER.

摘要： Tin phosphide(Sn_(4)P_(3))is a promising anode material for sodium-ion batteries because of its relatively large theoretical capacity,appropriate Na^(+) alloying potential,and good cyclic stability.Herein,the Sn_(4)P_(3) embedded into a carbon matrix with good rate performance and long cycle life is reported.The Sn_(4)P_(3)-C composite exhibits excellent rate performance(540 mAh g^(-1) at 5 A g^(-1))and the highest reversible capacity(844 mAh g^(-1) at 0.5 A ^(g-1))among Sn4P3-based anodes reported so far.Its reversible capacity is as high as 705 mAh g^(-1) even after 100 cycles at 0.5 A g^(-1).Besides,its initial Coulomb efficiency can reach 85.6%,with the average Coulomb efficiency exceeding 99.75%from the 3rd to 100th cycles.Na_(2)C_(6)O_(6) is firstly used as a cathode when Sn_(4)P_(3) acts as anode,and the Na-Sn_(4)P_(3)-C//Na_(2)C_(6)O_(6) full cell shows excellent electrochemical performance.These results demonstrate that the Sn_(4)P_(3)-C composite prepared in this work displays high-rate capability and superior cyclic performance,and thus is a potential anode for sodium ion batteries.

摘要： Erratum to:International Journal of Minerals,Metallurgy and Materials Volume 29,Number 3,March 2022,Page 490 https://doi.org/10.1007/s12613-021-2275-5 The original version of this article unfortunately contained a mistake.The author’s name in the original version is incorrect,which is:Hassan Jafari,Amir Houshang Mojiri Tehrani,Mojiri Tehrani,and Mahsa Heydari The correct version is given below:Hassan Jafari,Amir Houshang Mojiri Tehrani,and Mahsa Heydari The original version PDF file has been replaced by the corrected version PDF file.

摘要： High-efficiency solar cells often require light absorbers prepared from alloys, such as Cd Te_(1-x)Se_(x),CuIn_(x)Ga_(1-x)Se_(2), Cu_(2)ZnSnS_(4-x)Se_(x), and(Cs_(x)FA_(1-x))Pb(I_(1-y)Br_(y))_(3). However, how alloying affects solar cell performance is poorly understood, and determining common features associated with alloying is of significant interest. Herein, we studied the correlation between the A/X site compositional ratio and the photogenerated carrier dynamics using mixed halide perovskites(Cs_(x)FA_(1-x))Pb(I_(1-y)Br_(y))_(3)as examples.Nonadiabatic molecular dynamics calculations demonstrated that charge carrier recombination is highly sensitive to the compositional ratio at the A/X-site. The enhanced lifetime is attributable to the suppression of atomic fluctuations, the weakening of electron-phonon coupling, and a reduction in the electrontransition probability between band edges. The optimal Br concentration was determined to be ~18%, in agreement with experimental observations. This study not only advances our understanding of why mixed perovskites usually exhibit superior experimental photoelectric properties, but also provides a route for optimizing the carrier lifetimes and efficiencies of perovskite solar cells.

摘要： The sluggish electrochemical oxygen evolution reaction(OER) is a crucial process for clean energy conversion technology.The preparation of non-precious electrocatalysts with high performance for OER is still a main challenge.Herein,we report a FeNi_(3) nanoparticles incorporated on N-doped hollow carbon rod with extraordinary performance toward OER by in situ annealing the Ni-doped Fe based metal-organic frameworks(MOFs) precursors.Meanwhile,the pristine N atoms of MOFs doped into carbon frameworks can enhance the electrical conductivity,boost electron mass transport and electron transfer,and construct more active sites.Furthermore,constructing the Fe-Ni alloy structure can facilitate the formation of O-O bond,optimize the free energy for intermediate adsorption and improve OER performance.The as-prepared Fe-Ni bimetal decorated hollow N-doped nanocarbon hybrid structure possesses superior OER performance,which is surpass commercial IrO_(2) at a overpotential of only 340 mV to achieve the current density of 10 mA cm^(-2),as well as a small Tafel slope of 86.67 mV dec^(-1) in alkaline electrolyte.The Fe-Ni alloy/hollow N-doped nanocarbon hybrid structure shining the bright future for obtaining earth-abundant and superior efficient anode OER electrocatalyst.

摘要： The original version of this article unfortunately contained a mistake due to the PDF file conversion through different softwares.The presentation of Fig.13 in original version was incorrect.The correct version is given below.

摘要： The research center has been focusing its research&development programs in the following areas.Wear resistant white cast iron.Wear resistant austenitic manganese steel.Wear resistant medium and low alloy steel.Wear resistant spheroidal graphite iron.Wear resistant composite materials.Mechanism on the abrasion and corrosion for the wear resistant materials。

摘要： In order to exchange the academic achievements on the impact dynamics in recent years,we are organizing the special issue on the Impact Dynamics of Structures/Materials.We have gladly collected five high-quality papers in this area,including"Atomic-level mechanism of spallation microvoid nucleation in medium entropy alloys under shock loading","Dynamic response of ultralight all-metallic sandwich panel with 3D tube cellular core to shallow-buried explosives","Effect of impact deformation on shape recovery behavior in Fe-Mn-Si shape memory alloy under shape memory training process with cyclic thermo-mechanical loading","Mechanical behaviors of polycrystalline NiTi SMAs of various grain sizes under impact loading",and"Experimental investigation on the yield behavior of metal foam under shear-compression combined loading".

摘要： Synthetic grafting needs improvements to eliminate secondary surgeries for the removal of implants after healing of the defected tissues.Tissue scaffolds are engineered to serve as temporary templates,which support the affected tissue and gradually degrade through the healing period.Beside mechanical function to withstand the anatomic loading conditions,scaffolds should also provide a decent biological function for the diffusion of nutrients and oxygen to the cells,and excretion of the wastes from the cells to promote the new tissue growth and vascularization.Moreover,the degradation byproducts of the scaffolds should be safe to the human body.Development of such multifunctional scaffolds requires selection of the right material,design,and manufacturing method.Mg has been recognized as the prominent biodegradable metal with regards to its mechanical properties matching to that of human bone,degradability in the body fluid,and its ability to stimulate new tissue growth.Scaffolds with intricate porous structures can be designed according to the patient-specific anatomic data using computer aided designs.Additive manufacturing(AM)is the right method to materialize these models rapidly with reasonably acceptable range of dimensional accuracy.Thus,the recent research trend is to develop ideal scaffolds using biodegradable Mg through AM methods.This review compiles and discusses the available literature on the AM of biodegradable Mg parts from the viewpoints of material compositions,process conditions,formation quality,dimensional accuracy,microstructure,biodegradation,and mechanical properties.The current achievements are summarized together,and future research directions are identified to promote clinical applications of biodegradable Mg through the advancement of AM.

摘要： 本发明公开了Alloy25新型金属材料，包括碳、硅、磷、锰、硫、铬、镍、铌、钼和铁，各化学成分按照总量为100份的重量份数配比为碳0.02‑0.05份，硅1.3‑1.5份，磷0.02‑0.035份、锰0.8‑1份，硫0.01‑0.025份，铬24‑26份，镍25‑26份，铌0.2‑0.4份，钼0.2‑0.4份，其余为铁。本发明Alloy25这种新型耐热材料抗氧化能力大大提高，增加Ni(镍)含量，可以有效的增强材料本身在高温状态下的抗氧化能力，而增加金属元素Mo(钼)含量可以提高材料在高温状态下的红硬性，也就是增强抗弯强度，使材料不易弯曲，在高温下的氧化速度大幅降低。做成主轴后的整体强度也有较大提高，有效的延长了主轴的使用寿命，并使拉管产品质量明显提高，相应的材料成本增加不多。

摘要： 本发明公开了一种Alloy59合金的MIG焊接工艺，包含以下步骤：步骤一、焊接设备选择；步骤二、试板准备及坡口加工；步骤三、焊材选择；步骤四、气体准备；步骤五、焊前准备；步骤六、组对；将两块试板组对，留1‑2mm间隙，并在试板背面贴上步骤一中的陶瓷衬垫；步骤七、焊接。本方案使用脉冲MIG焊机，采用Ar+30％He的混合气作为保护气，提高电弧能量，改善熔深及焊缝金属的润湿性，从而获得良好的成型；在坡口背面贴一道陶瓷衬垫，保证焊缝背面成型，实现单面焊双面成型；在焊枪上加装一个特制的拖罩，拖罩内充氩气，从而保护处于高温的焊缝，最终获得银白色的焊缝。