Abstract
Nd/sub 15/Fe/sub 77.5/B/sub 7.5/ alloys were melted and solidified using the electromagnetic levitation technique. Bulk undercoolings of up to 78 K were achieved. Three kinds of primary phase formation were observed depending on the undercooling level. /spl gamma/-Fe solid solution was solidified as primary phase at low undercoolings. It was replaced by the peritectic /spl phi/-Nd/sub 2/Fe/sub 14/B compound upon reaching a critical undercooling of 40 K. The primary phase was changed further to the metastable /spl chi/-Nd/sub 2/Fe/sub 17/B/sub x/ (x = 0 - 1) compound above a second critical undercooling of 55 K. However, /spl gamma/-Fe formation reentered the samples with high undercoolings because of a strong recalescence. The /spl chi/-Nd/sub 2/Fe/sub 17/B/sub x/ compound was found to have decomposed during the post-solidification process, which also gave rise to a small amount of /spl gamma/-Fe in the solidified samples. Nevertheless, it was found that the total amount of the /spl gamma/-Fe phase in the samples with high undercoolings has been reduced due to the primary solidification of the two compound phases.
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