Effects of Nb addition on icosahedral quasicrystalline phase formation and glass-forming ability of Zr–Ni–Cu–Al metallic glasses

Fan, Cang; Li, Chunfei; Inoue, Akihisa; Haas, Volker
August 2001
Applied Physics Letters;8/13/2001, Vol. 79 Issue 7
Academic Journal
This work shows that the crystallization process of Zr–Ni–Cu–Al metallic glass is greatly influenced by adding Nb as an alloying element. Based on the results of the differential scanning calorimetry experiments for metallic glasses Zr[sub 69-x]Nb[sub x]Ni[sub 10]Cu[sub 12]Al[sub 9] (x=0–15 at. %), the crystallization process takes place through two individual stages. For Zr[sub 69]Ni[sub 10]Cu[sub 12]Al[sub 9] (x=0), metastable hexagonal ω-Zr and a small fraction of tetragonal Zr[sub 2]Cu are precipitated upon completion of the first exothermic reaction. Contrary to this alloy, the precipitation of a nanoquasicrystalline phase is detected when 5–10 at. % Nb is added. Furthermore, the crystallization temperature T[sub x], supercooled liquid region ΔT[sub x] and reduced temperature T[sub g]/T[sub L] (T[sub g] is the glass transition temperature, T[sub L] the liquidus temperature) increase with increasing Nb content. These results indicate that adding Nb content to Zr–Ni–Cu–Al metallic glasses not only induces quasicrystalline phase formation, but also enhances glass-forming ability. © 2001 American Institute of Physics.


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