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在Zr-Ce二元稳态难混溶合金的基础上添加Co-Cu二元亚稳态难混溶合金,设计了四元(Zr_aCe_b)_(1-x)(Co_cCu_d)_x复合难混溶合金.通过热力学计算了Cu和Co在两分离液相中的分配系数,并利用OM,SEM,EDS,XRD和DTA等方法研究了相形成和组织演变的机制.结果表明,单一均匀的(Zr_aCe_b)_(1-x)(Co_cCu_d)_x合金熔体在凝固过程中发生液相分离,Co和Cu元素分别分布在富Zr和富Ce液相中,最终形成富Zr-Co和富Ce-Cu两液相.在快速凝固条件下,四元合金液-液分离形成的富Zr-Co和富Ce-Cu两液相分别发生玻璃转变,形成锆基和铈基两非晶相.实验研究与热力学分析相结合,揭示了Co与Cu原子比例和Co-Cu合金添加量以及冷却速率对双非晶相形成的影响,探索了由难混溶合金制备相分离非晶合金的方法.当Co与Cu原子比及添加量分别为4∶1和38.5%时,在熔体旋甩快速冷却条件下可以获得双相非晶合金.
On the basis of Zr-Ce binary stable miscibility alloy, Co-Cu binary metastable hard-miscible alloy was added, and the quaternary (Zr_aCe_b) _ (1-x) (Co_cCu_d) Alloys.The distribution coefficients of Cu and Co in two separate liquid phases were calculated by thermodynamics.The mechanisms of phase formation and microstructure evolution were studied by means of OM, SEM, EDS, XRD and DTA.The results showed that the uniform and uniform distribution of Zr_aCe_b ) _ (1-x) (Co_cCu_d) _x alloy melt during the solidification process, the Co and Cu elements are distributed in the Zr-rich and Ce-rich liquid phase, and finally the Zr-rich and Co-rich Cu Two liquid phases.After rapid solidification, two liquid phases of Zr-Co-rich and Ce-Cu-rich phases formed by liquid-liquid separation of the quaternary alloy respectively undergo glass transformation to form two amorphous phases, zirconium and cerium.Experimental study and Thermodynamics analysis reveals the influence of Co and Cu atomic ratio and Co-Cu alloy addition rate and cooling rate on the formation of double amorphous phase, and explores the preparation method of phase separation amorphous alloy from miscible Al-alloy. Cu atomic ratio and the amount of addition of 4:1 and 38.5%, respectively, can be obtained under the condition of melt spinning rapid cooling under the conditions of dual-phase amorphous alloy.