In the present work, the glass formation of Zr59Nb5Cu18Ni8Al10 (numbers indicate at %) alloy with diameter of 2 mm was prepared through water-cooled copper mold casting and in a ribbon form by the single roller melt-s...In the present work, the glass formation of Zr59Nb5Cu18Ni8Al10 (numbers indicate at %) alloy with diameter of 2 mm was prepared through water-cooled copper mold casting and in a ribbon form by the single roller melt-spinning method. This study is primarily devoted to evaluating the results obtained with the two methods of the development. The thermal stability was evaluated by differential scanning calorimetry (DSC) at a heating rate of 10℃/mn. The characteristic data of the bulk metallic glass are presented, including glass transition temperature (Tg) and crystallization temperature (Tx). The microstructure and constituent phases of the alloy composite have been analyzed by using X-ray diffraction, and observed by Scanning Electron Microscopy (SEM). The mechanical properties of bulk Zr59Nb5Cu18Ni8Al10 were alloy measured by compression tests at room temperature.展开更多
The structure, crystallization kinetics and magnetic property of as-quenched Fe_(73.5)Si_(13.5)B_9Nb_3Cu_1 amorphous ribbon(R0) as well as ribbons after autoclave treatment at 100°C and 150°C(R1 and R2) have...The structure, crystallization kinetics and magnetic property of as-quenched Fe_(73.5)Si_(13.5)B_9Nb_3Cu_1 amorphous ribbon(R0) as well as ribbons after autoclave treatment at 100°C and 150°C(R1 and R2) have been systematically studied by various techniques. With increasing autoclave treatment temperature,the measured structural, kinetic and magnetic parameters of samples increase firstly, i.e. R0 < R1; and then decrease or recover to the as-quenched sample, i.e. R2 < R1 or R2 ≈ R0. These results indicate that the SROs in R1 samples increased by transforming from fcc to bcc structure during the autoclave treatment and that the autoclave treatment can decrease the large radius(r_M) MRO(medium range order),but increase the small rMMRO. The measured structural, thermal and magnetic parameters of R2 sample have a tendency to recover toward as-quenched R0 sample. The thermal and magnetic parameters of samples after solely annealing treatment at higher temperature have no obvious recover phenomenon.The uneven actions of pressure and temperature in autoclave treatment may be helpful for us to search a new method to improve the magnetic properties of Fe-based glasses.展开更多
Metallic glasses(MGs)are rising novae in the catalytic field,due to their unique amorphous structure,large residual stress,and high density of low coordination sites.However,there is still an absence of suitable MGs&#...Metallic glasses(MGs)are rising novae in the catalytic field,due to their unique amorphous structure,large residual stress,and high density of low coordination sites.However,there is still an absence of suitable MGs'catalysts for advanced oxidation processes(AOPs)with peroxymonosulfate(PMS),the most efficient and promising wastewater remediation technology.Herein,the cobalt-based MG(Co-MG)with a nominal composition of Co_(67)Fe_(4)-Mo_(1.5)Si_(16.5)B_(11)(at%)was utilized as an activator of PMS for azo dye degradation.The results demonstrated that the CoMG/PMS system had an order of magnitude higher efficiency on OrangeⅡ(OII)degradation than the Fe-MG/PMS system.For fundamental study and field application,the effect of adding inorganic anions(Cl^(-),HCO_(3)^(-),H_(2)PO_(4)^(-),SO_(4)^(2-),NO_(3)^(-)),environmental factors,and cycle experiments on the catalytic properties of Co-MG were investigated emphatically to evaluate overall degradation performance.It has demonstrated that the Co-MG with more stability,better corrosion resistance and durability contrasted to Fe-MGs.In addition,the excellent catalytic performance of Co-MG was analyzed based on the quenched experiment,electron paramagnetic resonance(EPR),and X-ray photoelectron spectroscopy(XPS)analysis.The present results provide not only a new candidate but also shed light on exploring a new kind of AOPs system based on Co-MGs for wastewater treatment.展开更多
文摘In the present work, the glass formation of Zr59Nb5Cu18Ni8Al10 (numbers indicate at %) alloy with diameter of 2 mm was prepared through water-cooled copper mold casting and in a ribbon form by the single roller melt-spinning method. This study is primarily devoted to evaluating the results obtained with the two methods of the development. The thermal stability was evaluated by differential scanning calorimetry (DSC) at a heating rate of 10℃/mn. The characteristic data of the bulk metallic glass are presented, including glass transition temperature (Tg) and crystallization temperature (Tx). The microstructure and constituent phases of the alloy composite have been analyzed by using X-ray diffraction, and observed by Scanning Electron Microscopy (SEM). The mechanical properties of bulk Zr59Nb5Cu18Ni8Al10 were alloy measured by compression tests at room temperature.
基金financially supported by the National Key Research Program of China(No.2016YFB0300501)the Key Research Project of Shandong Province(No.2016GGX102010)the National Natural Science Foundation of China(Nos.51471099,51571132,51511140291 and 51771103)
文摘The structure, crystallization kinetics and magnetic property of as-quenched Fe_(73.5)Si_(13.5)B_9Nb_3Cu_1 amorphous ribbon(R0) as well as ribbons after autoclave treatment at 100°C and 150°C(R1 and R2) have been systematically studied by various techniques. With increasing autoclave treatment temperature,the measured structural, kinetic and magnetic parameters of samples increase firstly, i.e. R0 < R1; and then decrease or recover to the as-quenched sample, i.e. R2 < R1 or R2 ≈ R0. These results indicate that the SROs in R1 samples increased by transforming from fcc to bcc structure during the autoclave treatment and that the autoclave treatment can decrease the large radius(r_M) MRO(medium range order),but increase the small rMMRO. The measured structural, thermal and magnetic parameters of R2 sample have a tendency to recover toward as-quenched R0 sample. The thermal and magnetic parameters of samples after solely annealing treatment at higher temperature have no obvious recover phenomenon.The uneven actions of pressure and temperature in autoclave treatment may be helpful for us to search a new method to improve the magnetic properties of Fe-based glasses.
基金financially supported by the National Key R&D Program of China(No.2021YFB3802800)the National Key R&D Program of China(No.2021YFB3802800)+2 种基金the National Natural Science Foundation of China(Nos.52101195 and 51871120)the Natural Science Foundation of Jiangsu Province(Nos.BK20190480 and BK20200019)the Fundamental Research Funds for the Central Universities(Nos.30920021156 and 30920010004)。
文摘Metallic glasses(MGs)are rising novae in the catalytic field,due to their unique amorphous structure,large residual stress,and high density of low coordination sites.However,there is still an absence of suitable MGs'catalysts for advanced oxidation processes(AOPs)with peroxymonosulfate(PMS),the most efficient and promising wastewater remediation technology.Herein,the cobalt-based MG(Co-MG)with a nominal composition of Co_(67)Fe_(4)-Mo_(1.5)Si_(16.5)B_(11)(at%)was utilized as an activator of PMS for azo dye degradation.The results demonstrated that the CoMG/PMS system had an order of magnitude higher efficiency on OrangeⅡ(OII)degradation than the Fe-MG/PMS system.For fundamental study and field application,the effect of adding inorganic anions(Cl^(-),HCO_(3)^(-),H_(2)PO_(4)^(-),SO_(4)^(2-),NO_(3)^(-)),environmental factors,and cycle experiments on the catalytic properties of Co-MG were investigated emphatically to evaluate overall degradation performance.It has demonstrated that the Co-MG with more stability,better corrosion resistance and durability contrasted to Fe-MGs.In addition,the excellent catalytic performance of Co-MG was analyzed based on the quenched experiment,electron paramagnetic resonance(EPR),and X-ray photoelectron spectroscopy(XPS)analysis.The present results provide not only a new candidate but also shed light on exploring a new kind of AOPs system based on Co-MGs for wastewater treatment.
