Bi_2Te_3合金熔体结构变化对凝固行为及凝固组织的影响  

Effects of Bi_2Te_3 Melts Structural Change on Solidification Behavior and Structures

作　　者：席赟[1] 黄中月[2] 祖方遒[2] 

机构地区：[1]合肥工业大学工业培训中心,安徽合肥230601 [2]合肥工业大学材料学院,安徽合肥230009

出　　处：《铸造技术》2012年第12期1424-1427,共4页Foundry Technology

摘　　要：根据Bi2Te3合金熔体的电阻率随温度而发生的异常行为,从熔体结构变化的视角探索了材料凝固行为与熔体热历史的依存关系。实验证明,Bi2Te3合金熔体结构在686～707℃范围内发生了异常转变,这种结构变化导致其熔体凝固过冷度增大,释放凝固潜热更加剧烈,并且凝固组织细化。这一结果表明通过控制熔体热历史,可更为有效地获得理想的凝固组织。According to the abnormal change of resistivity of Bi2Te3 melts, the correlation between the thermal history of melts and the solidification behavior was discussed. The results show that some anomalous changes of resistivity of Bi2Te3 melt can be found in the temperature range of686-707 ~C, which makes solidification undercooling degrees and latent heat increase and solidification structure ret＇me. This indicates that the ideal solidification structure can be obtained by controlling thermal history of melts.

关 键 词：BI2TE3 合金 电阻率 熔体结构转变 凝固行为 凝固组织 

分 类 号：TG111.4[金属学及工艺—物理冶金]