Ni₇₅Si₈B₁₇およびCo₇₅Si₁₀B₁₅アモルファス合金の疲労挙動におよぼす冷間圧延の影響

抄録

The effect of cold rolling on the fatigue life and the structural change of Ni₇₅Si₈B₁₇ and Co₇₅Si₁₀B₁₅ ribbon amorphous alloys during cyclic stressing was investigated by a pulsating tension fatigue test, X-ray diffraction and high resolution transmission electron microscopy.
In a micro-Vickers hardness test, both alloys became softer after cold rolling. In the case of the fatigue, a considerably different behavior was shown between as-quenched and rolled specimens.
Futhermore, by means of the pair distribution function method and the observation by transmission electron microscopy, it was confirmed that in the amorphous alloys the microscopic structural change was induced by the cold rolling and the excessively accumulated damage due to a number of stress cycles.