CAJ | 학술논문

为了探讨液?液结构转变的可逆性及熔体状态对凝固的影响，利用直流四电极法测量SnSb15合金熔体在三轮连续升降温过程中的电阻率?温度曲线。分析SnSb15合金熔体的不可逆和可逆转变的物理内涵，进而讨论不可逆转变对凝固影响的作用机制。结果表明：SnSb15合金熔体发生了温度诱导的液?液结构转变，其首轮升温过程的转变呈不可逆性，而后续降温及升温过程的转变呈可逆特征；且首轮升温过程的不可逆液?液结构转变显著影响合金的凝固行为和组织，如初生相和包晶相的形核过冷度分别增大9.7和5℃，凝固时间分别缩短2.5和4 s，并且凝固组织明显细化。
위료탐토액?액결구전변적가역성급용체상태대응고적영향，이용직류사전겁법측량SnSb15합금용체재삼륜련속승강온과정중적전조솔?온도곡선。분석SnSb15합금용체적불가역화가역전변적물리내함，진이토론불가역전변대응고영향적작용궤제。결과표명：SnSb15합금용체발생료온도유도적액?액결구전변，기수륜승온과정적전변정불가역성，이후속강온급승온과정적전변정가역특정；차수륜승온과정적불가역액?액결구전변현저영향합금적응고행위화조직，여초생상화포정상적형핵과랭도분별증대9.7화5℃，응고시간분별축단2.5화4 s，병차응고조직명현세화。
In order to study the reversibility of liquid-liquid structure transition (L-LST) and the effects of melt state on solidification, the electrical resistivity-temperature curves of SnSb15 melt were measured in three heating and cooling cycles by means of DC four-probe method. The physical connotation of irreversible and reversible L-LST was analyzed, and the effects of irreversible L-LST on solidification were also discussed. The results show temperature induced L-LST occurs in SnSb15 melt. L-LST in first heating process is irreversible, but it is reversible in subsequent cooling and heating processes. Besides, irreversible L-LST can significantly affect the solidification behavior and microstructure, i.e. the undercooling degrees for primary and peritectic phase enlarge 9.7 and 5℃, the solidification time shortens 2.5 and 4 s, respectively. Moreover, the solidification microstructures are refined obviously.