AI_(0.5)Cr_(0.9)FeNi_(2.5)V_(x)(x=0,0.2,0.4,0.6,0.8,1.0)multi-principal alloys were prepared by vacuum arc melting.The effect of vanadium addition on its microstructure and properties was investigated.The results show...AI_(0.5)Cr_(0.9)FeNi_(2.5)V_(x)(x=0,0.2,0.4,0.6,0.8,1.0)multi-principal alloys were prepared by vacuum arc melting.The effect of vanadium addition on its microstructure and properties was investigated.The results show that the alloys of all components exhibited an FCC single-phase structure.With the addition of vanadium,the microstructure of the alloy changed from dendrites to equiaxed crystals,the grains were remarkably refined,and the layered CrV phase was exhibited,which improved the properties of the alloy.The yield strength of the alloy was slightly improved,and the alloys with various components presented good plasticity.When V content reached 0.8,the yield strength was 600 MPa,and no fracture occurred.Friction-wear testing showed that the wear debris was reduced with the addition of V element.The sample with V element content of 0.4 had the best friction and wear performance.The surface grooves became shallow,the worn debris was less,and the wear mechanism was mainly abrasive wear.The polarisation curve showed that the alloy with V element content of 0.2 has the best corrosion resistance.The passivation interval reached 900 mV.The corrosion potential and the corrosion current density were-496.299 mV and 2.759μA/cm^(2),respectively.展开更多
Enterovirus 71 （EV71） and Coxsackievirus A16 （CoxA16） are the major pathogens causing hand, foot, and mouth disease （HFMD） that occurs primarily in children and infants with mild clinical manifestations. HFMD ca...Enterovirus 71 （EV71） and Coxsackievirus A16 （CoxA16） are the major pathogens causing hand, foot, and mouth disease （HFMD） that occurs primarily in children and infants with mild clinical manifestations. HFMD caused by EV71 could develop to a fatal neurological complication.展开更多
基金This work was financially supported by the Natural Science Foundation of Liaoning Province(No.2019-MS-247)the Liaoning Revitalization Talents Program(XLYC1807178)Scientific Research Project of Liaoning Provincial Department of Education(LJGD2019002).
文摘AI_(0.5)Cr_(0.9)FeNi_(2.5)V_(x)(x=0,0.2,0.4,0.6,0.8,1.0)multi-principal alloys were prepared by vacuum arc melting.The effect of vanadium addition on its microstructure and properties was investigated.The results show that the alloys of all components exhibited an FCC single-phase structure.With the addition of vanadium,the microstructure of the alloy changed from dendrites to equiaxed crystals,the grains were remarkably refined,and the layered CrV phase was exhibited,which improved the properties of the alloy.The yield strength of the alloy was slightly improved,and the alloys with various components presented good plasticity.When V content reached 0.8,the yield strength was 600 MPa,and no fracture occurred.Friction-wear testing showed that the wear debris was reduced with the addition of V element.The sample with V element content of 0.4 had the best friction and wear performance.The surface grooves became shallow,the worn debris was less,and the wear mechanism was mainly abrasive wear.The polarisation curve showed that the alloy with V element content of 0.2 has the best corrosion resistance.The passivation interval reached 900 mV.The corrosion potential and the corrosion current density were-496.299 mV and 2.759μA/cm^(2),respectively.
基金supported by the National Natural Science of China(81371833)Shandong Province Key Research and Development Plan(2015GGB2400)
文摘Enterovirus 71 （EV71） and Coxsackievirus A16 （CoxA16） are the major pathogens causing hand, foot, and mouth disease （HFMD） that occurs primarily in children and infants with mild clinical manifestations. HFMD caused by EV71 could develop to a fatal neurological complication.
