论文标题
在正常压力下液态液体温度的浓度行为和Al-Cu-CO过冷的行为
Concentration behavior of liquidus temperatures and undercooling of Al-Cu-Co at normal pressure
论文作者
论文摘要
已经对Al-Cu-CO合金进行了差异热分析，其组成范围为15 at。％CO，10至30 at。％Cu，25 at。％CU，At。％CO和2.5至20 at。％CO.在冷却速度（在冷却速度下，在冷却速率下，在坩埚中都研究了固体相形成的特征。在Al-Cu-CO系统的状态图上，构建了浓度截面的15个AT。％CO和25个AT。％Cu，这允许确定在结晶的第一阶段形成不同阶段的浓度范围。沿着不同相区域的边界，在液体线上观察到极值。在液体线上观察到的极端和底层过冷的浓度依赖性与液态和固态中所考虑的浓度的化学短距离顺序变化有关。
Differential thermal analysis has been conducted for the Al-Cu-Co alloys with the composition range of 15 at.% Co and 10 to 30 at.% Cu, and 25 at.% Co and 2.5 to 20 at.% Co. The features of the formation of solid phases have been studied during the crystallization in a crucible in the conditions of slow cooling (rate of cooling to 1 K s-1) at normal pressure. On the state diagram of the Al-Cu-Co system with 15 at.% Co and 25 at.% Cu the concentration sections have been built, which allows to determine the concentration ranges from which different phases are formed during the first stage of crystallization. Along the boundaries of different phase regions, extrema are observed on the liquidus line. The observed extrema on the liquidus lines and concentration dependences of undercooling are associated with change in the chemical short-range order at the considered concentrations both in the liquid and solid states.
