鉄系非晶質合金薄片状粉末の衝撃焼結

Abstract

Dynamic compaction of Fe-based amorphous alloy powder was performed by using a gun-type momentum trap method. Residual shock effects on the amorphous alloy samples was characterized by microstructural analysis (i.e. optical, SEM, and TEM observations), X-ray diffraction analysis, tensile strength test, and measurement of it's soft magnetic properties. Two attempts have been conducted to control the shock duration time and compression rate in the shock compaction process. It is found that magnetic properties of shock consolidated Fe-based amorphous alloy powder are strongly affected by impactor thickness which influences on shock duration time. The difference of the magnetic properties depending on the shock duration time is, however, reduced by appropriate heat treatments at the post shock stage. On the other hand, it is also found that a stepwise shock wave front structure, which can be produced by using the buffer material, is preferred to produce the consolidated amorphous alloy powder having superior soft magnetic properties.The problems to produce the superior shock consolidated product of amorphous alloy were discussed, based on the results obtained in the present study.