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采用熔融玻璃净化方法进行了大体积Ag42.4Cu21.6Sb36三元共晶合金的深过冷实验, 获得最大过冷度为114 K(0.16 TE). 发现在深过冷非平衡条件下三元共晶由e(Ag3Sb), (Sb)和q(Cu2Sb)三相组成, 而不是平衡相图中预期的(Ag), (Sb)和q(Cu2Sb)相. 小过冷条件下, 合金的凝固组织是初生q相、(e+q)和(e+Sb)二相共晶以及规则(e+q+Sb)三元共晶并存的混合形态. 随着过冷度的增大, 初生相和二相共晶逐渐消失, 而且三元共晶发生从规则共晶向不规则共晶的生长形态转变. 当过冷度超过102 K时, 不规则(e+q+Sb)三元共晶成为惟一的组织生长形态. 3个共晶相之间发生的竞争形核与生长是出现复杂生长形态的主要原因. 实验与理论计算结果表明, 金属间化合物q相是领先形核相.
The deep undercooling experiment of bulk Ag42.4Cu21.6Sb36 ternary eutectic alloy was carried out by melting glass purification method, and the maximum undercooling degree was 114 K (0.16 TE) .It was found that under the condition of deep subcooling and non-equilibrium, The crystal consists of three phases, e (Ag3Sb), (Sb) and q (Cu2Sb), rather than the phase (Ag), (Sb) and q (Cu2Sb) Tissue is a mixture of nascent eutectic (e + q) and (e + Sb) eutectic and eutectic (e + q + Sb) eutectic.With the increase of undercooling, And eutectic gradually disappear, and the eutectic changes from regular eutectic to irregular eutectic.When the undercooling exceeds 102 K, the irregular (e + q + Sb) eutectic Which is the only growth pattern of the organization.The competitive nucleation and growth of the three eutectic phases are the main reason for the complex growth morphology.The experimental and theoretical calculations show that the intermetallic compound q phase is the leading nucleation phase.