【摘要】 通过旋铸急冷工艺在真空中制备出了(Ni0.75Fe0.25)78-xZrxSi10B12(x=1、3、5、8、10)合金带材,获得了镍基非晶合金.采用XRD、DTA等测试手段分析了该工艺制备的合金非晶条带,研究了Zr对该合金体系的非晶形成能力和热稳定性的影响.X射线衍射分析表明,该合金体系皆为完全非晶.Diamond TG/DAT差热分析仪对非晶薄带的热稳定性及其相关参数Tg、Tx、Tm等的测量分析表明,该合金系中(Ni0.75Fe0.25)70Zr8Si10B12的过冷液相区温度范围ΔTx达58.62 K,约化玻璃转变温度trg约为0.666,表明该合金具有较高的非晶形成能力和热稳定性.当Zr原子分数较小(x≤8)时,Zr的添加提高Tg、Tx,并扩大过冷液相区ΔTx,使合金的非晶形成能力和热稳定性增加;Zr原子分数较大(x>8)时,Zr的添加诱导富Zr-Ni和Zr-Fe的原子团的形成,这些原子团会成为均质形核的核心,降低合金的非晶形成能力和热稳定性.更多还原

【Abstract】 Amorphous ribbon specimens of alloys(Ni_0.75Fe_0.25)_78-xZr_xSi₁₀B₁₂（x=1,3,5,8,10） were prepared by a single roller melt-spinning technique in vacuum ambient.The effect of Zr on glass forming ability and thermal stability of the alloys were investigated by using XRD and DTA analysis for the amorphous ribbons so prepared.The result from the analysis of XRD radiation indicated that specimens were fully amorphous.Glass transition temperature（T_g）,crystallization onset temperature（T_x）,melting temperature（T_m） and different indicators of glass forming ability（GFA） were measured and analyzed by differential thermal analysis（DTA）.Undercooled liquid region（ΔT_x） and normalized glass transition temperature(t_rg) of(Ni_0.75Fe_0.25)₇₀Zr₈Si₁₀B₁₂ amorphous alloy are 58.62 K and 0.666,respectively,indicating that the alloy had high glass forming ability and thermal stability.When concentration of Zr was less（x≤8）,the addition of Zr could increase T_g and T_x and extent ΔT_x of the phase of undcrcooled liquid,making the glass forming ability（GFA） and thermal stability of the alloy increased.When concentration of Zr was greater（x>8）,the addition of Zr could induce the formation of atom groups of rich Zr-Ni and Zr-Fe,which could act as nucleus of nucleation,decreasing their glass forming ability and thermal stability.更多还原