TY - JOUR
T1 - Directionally-solidified dendrite morphology with eight secondary arms in an FCC ordered phase alloy
AU - Mori, Yuhi
AU - Harada, Hiroshi
AU - Yokokawa, Tadaharu
AU - Kobayashi, Toshiharu
AU - Suzuki, Shinsuke
N1 - Funding Information:
The first author, Dr. Yuhi Mori, carried out this work as a Research Fellow of the Japan Society for the Promotion of Science (JSPS). This work was supported by JSPS Research Fellowship for Young Scientists under grant number 15J01523 . All the experiments were performed at NIMS in Japan. We acknowledge Dr. M. Osawa of NIMS for his advice on this work.
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/10/15
Y1 - 2018/10/15
N2 - We found a new dendritic solidification morphology with secondary arms growing in eight directions rather than the 〈1 0 0〉 directions expected for a face-centered cubic (FCC) alloy. A bulk single crystal of a Ni-base γ′ single-phase alloy was cast by withdrawing method in a directional solidification furnace. The solidification structure was observed using scanning electron microscopy and analyzed using electron back-scatter diffraction. These results demonstrated that the growth direction of the primary dendrites was [0 0 1], which is known to be the preferred growth direction for FCC metals and alloys. However, the primary dendrite had eight secondary arms growing in the high-Miller-index directions between 〈1 0 0〉 and 〈1 1 0〉. The main factor behind this new dendrite morphology is likely to be the anisotropic atomic stacking of L12 ordered phase, which is the primary phase of the investigated alloy.
AB - We found a new dendritic solidification morphology with secondary arms growing in eight directions rather than the 〈1 0 0〉 directions expected for a face-centered cubic (FCC) alloy. A bulk single crystal of a Ni-base γ′ single-phase alloy was cast by withdrawing method in a directional solidification furnace. The solidification structure was observed using scanning electron microscopy and analyzed using electron back-scatter diffraction. These results demonstrated that the growth direction of the primary dendrites was [0 0 1], which is known to be the preferred growth direction for FCC metals and alloys. However, the primary dendrite had eight secondary arms growing in the high-Miller-index directions between 〈1 0 0〉 and 〈1 1 0〉. The main factor behind this new dendrite morphology is likely to be the anisotropic atomic stacking of L12 ordered phase, which is the primary phase of the investigated alloy.
KW - A1. Crystal structure
KW - A1. Dendrites
KW - A1. Directional solidification
KW - A2. Growth from melt
KW - A2. Single crystal growth
KW - B1. Alloys
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U2 - 10.1016/j.jcrysgro.2018.07.036
DO - 10.1016/j.jcrysgro.2018.07.036
M3 - Article
AN - SCOPUS:85051241507
SN - 0022-0248
VL - 500
SP - 15
EP - 22
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
ER -