Preparation And Properties Of Amorphous Alloy Wires

Amorphous alloy wire refers to a kind of non-crystalline alloy wire with micron diameter,which has shown excellent performance in mechanical and soft magnetic properties.In recent years,with the rapid development of information manufacturing industry and the continuous improvement of preparation technology,electronic devices are developing towards miniaturization,high precision and high integration,and the amorphous alloy wire has been widely used in the field of precision instruments and sensors due to its advantages of micron size and excellent performance: its special giant magnetic impedance effect is used in high precision magnetic sensors;good electrical conductivity is used in the communication Its excellent mechanical properties are used in cardiovascular guidewires in the biomedical field.In the future,with the rapid development of automotive,metallurgy,national defense,medical,chemical and information fields,the research of amorphous alloy wire will be more in-depth and the application fields will be more extensive.This paper discusses the current research status of amorphous wire preparation technology both domestic and foreign,and successfully prepared cobalt-based,iron-based,nickel-based,and nickel-iron-based amorphous alloy wires by glass cladding method.Preparation process,mechanical properties,β-relaxation,and catalytic properties of glass-clad amorphous wires were studied and analyzed.Combining with amorphous ribbon of the same composition as a control experiment,the effect of energy state of amorphous alloy on its relaxation behavior and catalytic properties was emphasized.The main contents of the paper include:First,cobalt-based,iron-based,nickel-based and nickel-iron-based amorphous wires were prepared by the glass-clad method.In order to remove the glass layer on the surface,the amorphous glass-clad wires were immersed in a solution of hydrofluoric acid with a mass fraction of 40% for a period of time,and the glass layer removal of the glass-clad amorphous wires was investigated at different etching times to determine the optimal etching time.Then,XRD was used to determine the amorphous state of the prepared amorphous wires,and the beta relaxation behavior,relaxation enthalpy,mechanical properties,and elastic modulus of the amorphous wires were measured using differential scanning calorimetry,dynamic thermo-mechanical analysis,and nanoindentation to investigate the correlation between the beta relaxation and mechanical properties of metallic glasses;amorphous alloy ribbons of the same composition were prepared,which were compared with each other in terms of relaxation behavior and elastic modulus testing to reveal the effect of energy state of amorphous alloy on β-relaxation and mechanical properties.Combining with the preparation process of glass-clad amorphous wires,it was analyzed to derive the effect of gradient inhomogeneity on the energy state due to stress-induced generation during the preparation of amorphous wires,which affects the β-relaxation behavior and mechanical properties.At last,research on the catalytic properties of amorphous filaments.Electrochemical workstation was used to do the oxygen precipitation reaction,hydrogen precipitation reaction and total hydrolysis reaction of the amorphous wires,and the test results were compared with those of ribbons of the same composition to reveal the enhancement of the catalytic performance brought by the high energy state and structural gradient inhomogeneity of the amorphous wires found in the previous work.In addition,to enhance the catalytic performance of the amorphous filaments,the amorphous wires were de-alloyed to form a three-dimensional porous structure.The porous amorphous wires were tested for oxygen precipitation reaction,hydrogen precipitation reaction and total hydrolysis reaction,which revealed the significant improvement of catalytic performance due to the porous structure.