Fe₇₅Si₁₀B₁₅アモルファス丸細線の静強度と疲労強度におよぼす雰囲気の影響

抄録

This paper deals with the static and dynamic tensile properties of an amorphous Fe₇₅Si₁₀B₁₅ wire at various temperatures and atmospheres. The wire has been produced by the in-rotating water spinning method, its diameter being about 126 μm. The main results are as follows:
(1) The tensile strength depends on the temperature and strain rate. The fatigue strength at higher temperature increases with rising temperature because of the superposed effects of the reducing humidity and the cyclic stresses causing a structure change.
(2) Since the tensile strength of the amorphous wire depends on the relative humidity of the air, the fatigue strength is especially low in comparison with the tensile strength.
(3) In air, the fatigue strength of the amorphous wire is lower than a commercial piano wire or a hard drawn steel wire. The fatigue life of the wire is improved in inert argon gas and nitrogen gas in this order.
(4) The fatigue fracture occurs on the surface due to uniform deformation. Any distinct striation pattern which characterizes fatigue fracture is not observed on the fracture surface.