Abstract
Liquid phase segregation of immiscible alloys has been investigated for decades. In this work, rare-earth Ce was studied as an additive for Al-Bi immiscible alloys. The addition of Ce restrained liquid phase segregation to obtain a uniformly dispersive microstructure. The experimental results indicated that in situ-precipitated intermetallic CeBi2 compound acted as an inoculant for the heterogeneous nucleation of the Bi-rich droplets. The Bi-rich droplets nucleated on the CeBi2 compound surface—a homogenous dispersed microstructure obtained via a heterogeneous nucleation route. We concluded that gravity segregation can be suppressed by the addition of rare-earth Ce.
Highlights
Immiscible alloys have been investigated as a kind of special metallurgy characteristics alloy [1,2,3].In phase diagrams, immiscible alloys have a miscibility gap in the liquid state
We investigated the effect of rare-earth Ce on the liquid phase segregation of Al-Bi immiscible alloys
Al‐Bi immiscible alloys are effectively fabricated with dispersed fine second phase
Summary
Immiscible alloys have been investigated as a kind of special metallurgy characteristics alloy [1,2,3]. Immiscible alloys have a miscibility gap in the liquid state. When temperature exceeds the immiscibility gap, the binary phases become a uniform liquid phase. The alloys begin liquid–liquid phase separation when temperature is cooled down into the miscibility gap. The liquid–liquid phase separation results in a segregated microstructure. Immiscible alloys have potential practical applications, especially in advanced bearing materials for their self-lubricating property. Some literature [7,8] has indicated that the excellent self-lubricating performance is dependent on a uniformly-dispersed distribution of the soft phase. The potential applications of immiscible alloys have been restricted because of the segregation between matrix and soft phase. To obtain dispersive solidified morphology is an unsolved scientific problem
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