【摘要】 Gd作为优异的中子吸收剂，在中子吸收元素中具有最大的热中子俘获截面。采用铜金属型铸造法研究了Fe66Cr2Nb4Y6-xGdxB22(x=2,4,5,6 at.%)合金的非晶形成能力及力学性能。结果表明：当Gd含量为2 at.%和4 at.%时，两种合金的非晶形成能力分别为3 mm和4mm。进一步提高Gd含量，合金的非晶形成能力低于3 mm。Fe66Cr2Nb4Y2Gd4B22合金具有最大的非晶形成能力，其过冷液相区ΔTx、约化玻璃转变温度Trg和非晶形成能力判定参数γ均达到最大值，分别为56 K,0.667 3和0.424 1。但是Fe66Cr2Nb4Y6-xGdxB22(x=2 at.%,4 at.%,5 at.%)非晶合金的抗压强度和显微硬度随Gd含量的增加而降低。更多还原

【Abstract】 As an excellent neutron absorber,Gd has the largest thermal neutron capture cross section in the neutron absorbing elements.The amorphous forming ability and mechanical properties of Fe₆₆Cr₂Nb₄Y_6-xGd_xB₂₂（x=2 at.%,4 at.%,5 at.%,6 at.%）alloy were studied by copper-mould cast.The results showed that when the Gd content was 2 at.%and 4 at.%,the glass-forming ability of both alloys was 3 mm and 4 mm,respectively.Further increasing the Gd content,the glass-forming ability of the rest alloys was less than 3 mm.The Fe₆₆Cr₂Nb₄Y₂Gd₄B₂₂ alloy exhibits the largest glass-forming ability,the corresponding supercooled liquid region,ΔT_x,the reduced glass transition temperature,T_rg,and the criteria for determining the glass-forming ability,γ,all reached the maximum value of 56 K,0.667 3 and 0.424 1,respectively.更多还原