Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8148343 | Journal of Crystal Growth | 2018 | 27 Pages |
Abstract
We found a new dendritic solidification morphology with secondary arms growing in eight directions rather than the ã1â¯0â¯0ã directions expected for a face-centered cubic (FCC) alloy. A bulk single crystal of a Ni-base γⲠsingle-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 [0â¯0â¯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 ã1â¯0â¯0ã and ã1â¯1â¯0ã. 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.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Yuhi Mori, Hiroshi Harada, Tadaharu Yokokawa, Toshiharu Kobayashi, Shinsuke Suzuki,