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 behavior of resistivity of Bi2Te3 alloy melt with temperature, the dependence of material solidification behavior on melt thermal history was explored from the perspective of melt structure change. The experimental results show that the melt structure of Bi2Te3 alloy undergoes anomalous transformation in the range of 686-707 ℃. The structural changes lead to the increase of the degree of supercooling, the more intense latent heat of solidification and the refinement of the solidified microstructure. This result shows that by controlling the melt heat history, the ideal solidified structure can be obtained more effectively.