Preparation and thermal stability of Pd_40.5Ni_40.5Si_xP_19-x bulk metallic glasses

Yang Li,Yao-cen Wang,and Ke-fu Yao Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China

摘 要：<正>With the addition of Si to replace some P,Pd_40.5Ni_40.5Si_xP_19-x（x=0,2.5,5,9.5,14,and 19 in atomic number fraction） bulk glassy samples with the diameter of about 5 mm were successfully prepared by use of flux treatment and water quenching technology.With the increase of Si content,the glass forming ability of Pd_40.5Ni_40.5Si-xP_19-x increases first for low Si content and then decreases for high Si content （Si≥9.5at%）.The Pd₍40.50Ni_40.5Si₅P₁₄ glassy alloy possesses the largest supercooled liquid region△T of 119 K,the largest reduced glass transition temperature of 0.621,and the largestγparameter of 0.460,indicating that this glassy alloy possesses very large glass forming ability and very high thermal stability.

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