Synthesis, thermal stability and properties of [(Fe1−xCox)72Mo4B24]94Dy6 bulk metallic glasses
Synthesis, thermal stability and properties of [(Fe1−xCox)72Mo4B24]94Dy6 bulk metallic glasses
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DOI：
10.1016/j.jallcom.2010.12.109
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发表时间：
2011-03
影响因子：
6.2
通讯作者：
S. Tao;Zubair Ahmad;Hong Jian;T. Ma;M. Yan
中科院分区：
文献类型：
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作者：
S. Tao;Zubair Ahmad;Hong Jian;T. Ma;M. Yan
[(Fe1−xCox)72Mo4B24]94Dy6（x=0.1, 0.2, 0.3, 0.4和0.5at）采用铜模铸造方法制备了临界直径达3mm的棒状大块金属玻璃（bmg）。该合金体系具有良好的热稳定性，玻璃化转变温度（Tg） 860K，结晶温度（Tx） 945K。Co的加入可以有效地使合金成分向共晶方向深入，从而降低液相温度（Tl）。[(Fe0.8Co0.2)72Mo4B24] 94dy6合金的过冷区最大（ΔTx=Tx−Tg=92K），玻璃化转变温度降低（Trg=Tg/Tl=0.622）， γ参数降低（γ=Tx/(Tg+Tl)=0.424）。由于合金成分之间具有较强的结合结构，最大抗压断裂强度为3540MPa，显微维氏硬度为1185kg/mm2。该合金体系具有较高的软磁性能，饱和磁化强度为56.61 ~ 61.78 am2 /kg，矫顽力为222 ~ 264.2 a /m，适合应用于电力电子器件。
A series of [(Fe1−xCox)72Mo4B24]94Dy6(x=0.1, 0.2, 0.3, 0.4 and 0.5at.%) bulk metallic glasses (BMGs) in rod geometries with critical diameter up to 3mm were fabricated by copper mold casting method. This alloy system exhibited good thermal stability with high glass transition temperature (Tg) 860K and crystallization temperature (Tx) 945K. The addition of Co was found to be effective in adjusting the alloy composition deeper to eutectic, leading to lower liquidus temperature (Tl). The [(Fe0.8Co0.2)72Mo4B24]94Dy6alloy showed the largest supercooled liquid region (ΔTx=Tx−Tg=92K), reduced glass transition temperature (Trg=Tg/Tl=0.622) and gamma parameter (γ=Tx/(Tg+Tl)=0.424) among the present system. Maximum compressive fracture strength of 3540MPa and micro-Vickers hardness of 1185kg/mm2was achieved, resulting from the strong bonding structure among the alloy constituents. The alloy system possessed soft magnetic properties with high saturation magnetization of 56.61–61.78Am2/kg and coercivity in the range of 222–264.2A/m, which might be suitable for application in power electronics devices.