CAJ | 학술논문

采用熔融玻璃深过冷技术和金相分析法，对Cu-(10%～30%)Co合金液态深过冷条件下的二次液相分解和合金的凝固行为进行了分析。研究表明，由于液相分解后富Co液相的溶解度随温度下降而降低，使Cu原子不断从富Co液相中分解出来。如果分解出的Cu原子不能扩散到富Cu液相中，会在富Co液相内形成富Cu液滴。但合金凝固后富Co相中富Cu相并非都来自于二次液相分解，一部分是来自于富Co液相长大和富Co相选分结晶。冷却曲线的测定结果和分析显示， Cu-Co合金液相分解后，富Co液相的结晶温度与合金成分和实验条件有关。富Co液滴结晶完成后发生了包晶转变。
채용용융파리심과랭기술화금상분석법， 대Cu-(10%～30%)Co합금액태심과랭조건하적이차액상분해화합금적응고행위진행료분석。 연구표명， 유우액상분해후부Co액상적용해도수온도하강이강저， 사Cu원자불단종부Co액상중분해출래。 여과분해출적Cu원자불능확산도부Cu액상중， 회재부Co액상내형성부Cu액적。 단합금응고후부Co상중부Cu상병비도래자우이차액상분해， 일부분시래자우부Co액상장대화부Co상선분결정。 냉각곡선적측정결과화분석현시， Cu-Co합금액상분해후， 부Co액상적결정온도여합금성분화실험조건유관。 부Co액적결정완성후발생료포정전변。
The secondary liquid separation and solidification behaviors of Cu-(10%～30%)Co alloys under deep supercooling were investigated by means of fluxing glass deep supercooling technology and metallographic analysis. The results reveal that Cu is continuously separated from Co-rich liquid as temperature decreasing. If Cu atoms can not diffuse into Cu-rich liquid phase, new Cu-rich liquid drops will form. Not all of Cu-rich phases in Co-rich matrix come from the secondary liquid separation, one originates select solidifying and another result from Co-rich clusters growing. The cooling curves of alloys reveal that the crystallizing temperature of Co-rich phase is different with the variations of the composition and experiment condition. Peritectic reaction will occur after solidification of Co-rich liquid drops.