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Formation of Icosahedral Quasicrystals and 1/1 Crystal Approximants in Al Pd RE (RE: Rare Earth Metals) Systems

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Figure

Fig. 2The formation areas of the Al-Pd-Sc i-, 1/1- and the Ga-Pd-Sc 1/1-phases. The areas surrounded by solid line indicate the compositions atwhich single phase samples of the Al-Pd-Sc i- and 1/1-phases wereobtained
Fig. 3DSC spectra during heating for the as-solidified alloys of i-Al53:6Pd30:0Sc16:4 (a), 1/1-Al56Pd29Sc15 (b) and 1/1-Ga55Pd30Sc15 (c),respectively.
Fig. 5Selected area electron diffraction patterns of the i-phase in the melt-quenched Al54Pd30Yb16 alloy, where the incident beam is along 2-fold (a),3-fold (b) and 5-fold (c) directions, respectively.
Table 1Formation and stability of the Tsai-type i-phases containing trivalent RE. For each system, the number of valence electrons peratom (e=a) ratio and the atomic radius ratio (t ¼ rC=rA,B) are shown, where the rC is the atomic radius of the 15–16 at% element and rA,Bis the weighted-average of atomic radius of the other two elements.

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