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Formation and microstructure of quasicrystals in suction cast Al‐6 wt.% Mn alloys with additions of nickel and iron elements
Author(s) -
Chen Z.,
Xie B.,
Fan Q.
Publication year - 2018
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201700128
Subject(s) - quasicrystal , microstructure , icosahedral symmetry , alloy , materials science , phase (matter) , transmission electron microscopy , crystallography , nickel , metallurgy , scanning electron microscope , electron diffraction , atom probe , atom (system on chip) , analytical chemistry (journal) , diffraction , chemistry , composite material , nanotechnology , physics , organic chemistry , chromatography , optics , computer science , embedded system
The formation and microstructure of quasicrystals in suction cast Al‐6 wt.% Mn‐2 wt.% TM (TM = Ni, Fe) alloys were investigated by transmission electron microscopy, scanning electron microscopy, energy dispersive spectrometry, and X‐ray diffraction. The suction cast Al‐6 wt.% Mn‐2 wt.% Ni alloy consists of a single decagonal phase of Al 56 Mn 11 Ni 2 , whereas the Al‐6 wt.% Mn alloy with 2 wt.% iron addition comprises a primitive icosahedral phase and a decagonal phase of Al 40 Mn 7 Fe 2 . Thus, the addition of nickel or iron favors quasicrystal formation in the suction cast Al‐6 wt.% Mn alloys. Based on a 4 : 1 matching ratio of aluminum atoms to heavier atoms, the approximate electron to atom ratio is 1.85 in two decagonal phases of Al 56 Mn 11 Ni 2 and Al 40 Mn 7 Fe 2 . Various morphologies of quasicrystals with a size of more than 5 μm were observed in the microstructure of suction cast Al‐6 wt.% Mn‐2 wt.% TM (TM = Ni, Fe) alloys. The decagonal Al 40 Mn 7 Fe 2 phase nucleates epitaxially and grows on the icosahedral phase.