Formation and Mechanical Properties of Zr-Nb-Cu-Ni-Al-Lu Bulk Glassy Alloys with Superior Glass-Forming Ability

赵相金¹，LIU Wei¹，LIU Li¹，ZHANG Tao²，PANG Shujie²，MA Chaoli²

1. School of Environment and Materials Engineering,Yantai University2. Department of Materials Science and Engineering,Beijing University of Aeronautics and Astronautics

摘 要：Glass-forming ability（GFA） and mechanical properties of(Zr_0.58Nb_0.03Cu_0.16Ni_0.13Al_0.10)_100-xLu_x（x= 0-3 at%） alloys have been investigated.The GFA of Zr₅₈Nb₃Cu₁₆Ni₁₃Al₁₀ alloy is dramatically enhanced by adding Lu.The(Zr_0.58Nb_0.03Cu_0.16Ni_0.13Al_0.10)₉₈Lu₂ alloy possesses the highest GFA in the studied Zr-Nb-Cu-Ni-Al-Lu alloys,with its critical diameter for glass formation reaching 20 mm by copper-mould casting method,while that of the Lu-free Zr₅₈Nb₃Cu₁₆Ni₁₃Al₁₀ alloy is 7 mm.The critical diameters of(Zr_0.58Nb_0.03Cu_0.16Ni_0.13Al_0.10)_100-xLu_x（x =1 at%and 3 at%） alloys are 15 mm and 12 mm,respectively.The Lu addition to Zr₅₈Nb₃Cu₁₆Ni₁₃Al₁₀ alloy induces the change of initial crystallization phases from face-centred-cubic Zr₂Ni and tetragonal Zr₂Ni phases for the Lu-free Zr₅₈Nb₃Cu₁₆Ni₁₃Al₁₀ alloy to an icosahedral quasi-crystalline phase for the Lu-doped alloys,which may be the origin for the enhanced GFA of the Lu-doped alloys.The compressive fracture strength and plastic strain of the bulk glassy(Zr_0.58Nb_0.03Cu_0.16Ni_0.13Al_0.10)₉₈Lu₂ alloy are1 610 MPa and 1.5%,respectively.

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