In the present work, crystal structure and formation mechanism of the secondary phase in Heusler Ni-Mn-Sn-Co materials were investigated using X-ray diffraction, scanning/transmission electron microscopy and selected-area electron diffraction techniques. Experimental results showed that the secondary phase presented in both Ni44.1Mn35.1Sn10.8Co10 as-cast bulk alloy and melt-spun ribbon, possessing a face-centered cubic (fcc) Ni17Sn3-type structure. The secondary phase in the as-cast bulk alloy was resulted from a eutectic reaction after the formation of a primary dendritic b phase during cooling. However in the melt-spun rapidly solidified ribbon, the secondary phase was largely suppressed as nano-precipitates distributed along the grain boundaries, which was attributed to a divorced eutectic reaction. The secondary phase exhibited partial amorphous state due to high local cooling rate.
Jin-Ke Yu
,
Hong-Wei Li
,
Qi-Jie Zhai
,
Jian-Xun Fu
,
Zhi-Ping Luo
,
Hong-Xing Zheng
. Crystal structure and formation mechanism of the secondary phase in Heusler Ni-Mn-Sn-Co materials[J]. Advances in Manufacturing, 2014
, 2(4)
: 353
-357
.
DOI: 10.1007/s40436-014-0093-y
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