Investigation of Nanoscale Phase Formation in Rapidly Solidified Fe&lt;sub&gt;20&lt;/sub&gt;Co&lt;sub&gt;20&lt;/sub&gt;Ni&lt;sub&gt;20&lt;/sub&gt;Cr&lt;sub&gt;20&lt;/sub&gt;B&lt;sub&gt;20−&lt;/sub&gt;&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;Si&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt; Alloys

Yicheng Zhang,Hidenori Era,Koji Inoue,Tatsuya Tokunaga,Manabu Ishimaru

doi:10.2320/matertrans.mt-m2022058

Abstract

In this study, nanoscale phase formation in rapidly solidified Fe20Co20Ni20Cr20B20−xSix alloys was investigated using atom probe tomography (APT) and transmission electron microscopy (TEM). According to previous X-ray diffraction measurements and scanning electron microscopy with energy-dispersive X-ray spectroscopy results, it was thought that this alloy system was composed of almost a single face-centered cubic (FCC) solid solution phase when the Si content was 5 at.%. However, APT and TEM results at the nanoscale showed that both an FCC solid solution and compound phases formed for all alloy compositions. The rapidly solidified alloy ribbon with a Si content of 5 at.% showed the presence of nanoscale FCC and Cr2B phases. Furthermore, in addition to the nanoscale FCC and Cr2B phases, a nanoscale Cr3Ni5Si2 phase was observed when the Si content exceeded 7.5 at.%.

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