【摘要】 稀土元素是改善非晶态合金形成能力和性能的重要添加剂,本文采用铜模吸铸法制备了一系列Cu_50-xZr₄₆Al₄RE_x（RE=Dy,Tb,Gd;x=0,1,2,3,4）非晶态合金,系统地探究了重稀土元素Dy、Tb、Gd添加对Cu-Zr-Al合金非晶形成能力（GFA）和力学性能的影响。实验结果表明加入重稀土元素Dy、Tb、Gd后,合金系的玻璃转变温度显著降低,而过冷液相区宽度ΔT_x（ΔT_x=T_x-T_g）增大,1%（原子分数）的Dy、Tb和3%（原子分数）的Gd添加获得了最大的γ=T_x/（T_g+T_l）参数值,表明合适的添加量有利于合金非晶形成能力的提高。同时,适量的Dy、Tb、Gd引入可以显著提高Cu-Zr-Al合金的塑性变形能力。硬度和γ参数随稀土元素含量的变化呈现相似的变化趋势,表明非晶形成能力与硬度之间存在一定的关联性。稀土元素添加导致非晶态合金样品硬度呈现更大的径向不均匀性,有利于合金塑性变形能力的提高。更多还原

【Abstract】 Rare earth elements are important additives to improve the forming ability and properties of amorphous alloys. A series of Cu_50-xZr₄₆Al₄RE_x（RE=Dy, Tb, Gd; x=0, 1, 2, 3, 4） amorphous alloys are prepared by copper mold suction casting method. The effects of Dy, Tb, and Gd on the glass forming ability（GFA） and mechanical properties of Cu₅₀Zr₄₆Al₄ alloys are systematically investigated. The experimental results show that with the addition of Dy, Tb, and Gd, the glass transition temperature of the alloy system decreases significantly, while the width of supercooled liquid region ΔT_x increases. The maximum value of γparameter is obtained by adding 1 at% Dy, Tb, and 3 at% Gd, which indicates that the appropriate addition amount is beneficial to the improvement of glass forming ability. At the same time, the plastic deformation ability of Cu-Zr-Al alloy can be improved by adding proper amount of Dy, Tb and Gd. The results show that there is a close relationship between the glass forming ability and the hardness. The addition of rare earth elements leads to a greater radial inhomogeneity in the hardness of the alloy samples, which is conducive to the improvement of the plastic deformation ability of the alloy.更多还原