EFFECT OF Pd SUBSTITUTION ON THE STRUCTURES OF Ti-Zr-Ni QUASICRYSTALLINE ALLOYS
HUANG Huogen; JIA Jianping; LI Rong
National Key Laboratory for Surface Physics and Chemistry; Mianyang 621907
Cite this article:
HUANG Huogen JIA Jianping LI Rong. EFFECT OF Pd SUBSTITUTION ON THE STRUCTURES OF Ti-Zr-Ni QUASICRYSTALLINE ALLOYS. Acta Metall Sin, 2009, 45(10): 1272-1276.
Quasicrystals are a kind of special crystals, combining aperiodicity with long–range translational order and displaying a strong potential of applications. However, the forming law of quasicrystals, especially icosahedral, which have drawn a lot of attention since the discovery of the first quasicrystal, are not clearly known. A general knowledge, derived from the past work, is that the quasicrystal belongs to Hume–Rothery phase with special electron concentration per atom (e/a), and furthermore needs meeting the topological packing of atoms. Based on this, certain criteria named by e/a–constant line, e/a–variant line and cluster line, et al., have been used to design novel quasicrystals, especially in ternary alloy systems. But, as indicated in the previous work, these rules would not work very well in pseudo–ternary or quaternary systems built on Ti–Zr–Ni quasicrystals with the addition of Co or Cu. In order to further specify the quasicrystal formation in multi–component systems, in the present study an investigation was conducted in an alloy system, based on Ti45Zr38Ni17 and Ti40Zr40Ni20 alloys with the addtion of Pd, because Pd is the neighbourship of Ni in the element table like Co and Cu and has the atom size and e/a between Ti (or Zr) and Ni. Using XRD, TEM and OM, it is found that in the suction cast alloys, the icosahedral quasicrystal (IQC) phase is formed in the coexistence of a little bcc β–(Ti,Zr) in Ti45Zr38Ni17 alloy and of a bit hexagonal α–(Ti,Zr) in Ti40Zr40Ni20 alloy. And after 2%Pd (atomic fraction) substitution for Ti and Zr, a MgZn2–type Laves C14 hase with coordination nuber of 14 is precipitated along with the disappearance of β–(Ti,Zr) with coordination number of 8 in the former alloy, while only a complete IQC phase with coordination number of 12 is yielded in the latter alloy. However, as the subtitution is increased up to 6.7% or 13.3% in Ti40Zr40Ni20 alloy, the formation of IQC is prevented and the C14 phase occurs instead till a single C14 phase formin Ti40Zr26.7Ni20Pd13.3 alloy. The results show that the Pd addition in Ti–Zr–Ni allos would promte closer atom packing, being beneficial to the formation of Laves phase because of the weak interaction between Fermi surface and Brillouin zone in Hume-Rthery phase like IQC.
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