TY - JOUR
T1 - Crystallographic orientations and interfaces of icosahedral quasicrystalline phase growing on cubic W phase in Mg-Zn-Y alloys
AU - Singh, Alok
AU - Watanabe, M.
AU - Kato, A.
AU - Tsai, A. P.
N1 - Funding Information:
This work is partially supported by Japan Science and Technology Corporation.
PY - 2005/4/25
Y1 - 2005/4/25
N2 - Formation of icosahedral quasicrystalline phase on the W cubic phase in α-Mg matrix has been studied in a Mg97Zn2.5 Y0.5 alloy. The orientation relationship of the W phase with the matrix is determined to be [0 0 1]W ∥[1 0 0]Mg, (1 1 0)W∥ (0 0 1)Mg, equivalent to Burgers orientation relationship. The icosahedral phase forms curved interfaces with the W phase, but planar interfaces on five-fold and two-fold planes with the matrix. The icosahedral phase shows its unique orientation relationship to the W phase, which results in two orientation relationships WOR1 and WOR2 with the matrix. WOR1 is a slight deviation of the orientation relation, OR1, of icosahedral phase precipitates in the matrix. In WOR2, one of the five-fold axes occur along the hexagonal axis. The resulting morphology and the interface structures are described here. It is shown that WOR1 and WOR2 are related to each other by twinning of the icosahedral phase.
AB - Formation of icosahedral quasicrystalline phase on the W cubic phase in α-Mg matrix has been studied in a Mg97Zn2.5 Y0.5 alloy. The orientation relationship of the W phase with the matrix is determined to be [0 0 1]W ∥[1 0 0]Mg, (1 1 0)W∥ (0 0 1)Mg, equivalent to Burgers orientation relationship. The icosahedral phase forms curved interfaces with the W phase, but planar interfaces on five-fold and two-fold planes with the matrix. The icosahedral phase shows its unique orientation relationship to the W phase, which results in two orientation relationships WOR1 and WOR2 with the matrix. WOR1 is a slight deviation of the orientation relation, OR1, of icosahedral phase precipitates in the matrix. In WOR2, one of the five-fold axes occur along the hexagonal axis. The resulting morphology and the interface structures are described here. It is shown that WOR1 and WOR2 are related to each other by twinning of the icosahedral phase.
KW - Interfaces
KW - Magnesium-alloys
KW - Quasicrystals
KW - Transmission electron microscopy (TEM)
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U2 - 10.1016/j.msea.2005.02.036
DO - 10.1016/j.msea.2005.02.036
M3 - Article
AN - SCOPUS:17644382273
VL - 397
SP - 22
EP - 34
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
IS - 1-2
ER -