Effect of Cr content on decomposition behaviour of amorphous Nd5Fe74Cr3B18

Effects of Cr on the early crystallization stages of Nd4.5Fe77-xCrxB18.5 amorphous ribbons

“…The crystallization processes of Nd 4.5 Fe 77-x Cr x B 18.5 amorphous ribbons are almost similar to those of the Cr-free ribbons reported in previous studies [11,[19][20][21] [14,15,17,18]. The discussion, therefore, will focus on this stage.…”

“…3 to 7). Some results using 57 Fe Mössbauer spectra [9,14,15] or APFIM [17,18] reported that Cr preferentially moves to Fe 3 B. Such results imply that Cr has a strong chemical attraction to B.…”

“…[12], and among them, Cr has been known to stabilize the Fe 3 B phase, to suppress grain growth and the formation of the metastable Nd 2 Fe 23 B 3 phase [13], effectively improving coercivity. Thus, it is important to understand the role of the Cr atoms on the crystallization processes [9,[14][15][16][17][18].…”

“…For example, Suzuki et al [14,15] reported that Nd 2 Fe 23 B 3 particles continuously form in the Cr-free and that low Cr containing ribbons heated at rates below 1.3Ksec −1 but do not precipitate in ribbons containing Cr higher than 5 at.%. On the other hand, Gu et al [17,18] reported that both the Nd 2 Fe 23 B 3 and Nd 2 Fe 14 B phases do not form in the ribbons containing Cr lower than 8 at.% and that the first crystallizing phase is in the amorphous phase in the ribbons with Cr above 16 at.% is Fe 2 B.…”

Electron Irradiation Induced Nano-Crystallization in Fe<SUB>77</SUB>Nd<SUB>4.5</SUB>B<SUB>18.5</SUB> Metallic Glass

“…5,6) A large number of studies have been carried out focusing on the effects of alloy composition, cooling rate of liquid and annealing condition of an amorphous phase on the nanostructure in Fe-Nd-B based alloys. [7][8][9][10][11] Recently, it was found that nanocrystallization of an amorphous phase can be achieved in several metallic glass by electron irradiation and a unique nano-crystalline structure is obtained. [12][13][14][15] Electron irradiation stimulates atomic displacement in an amorphous phase by electron knock-on effect.…”