CAJ | 학술논문

基于平均体积方法建立过冷单相固溶体合金的凝固动力学模型并研究反向扩散在凝固动力学过程中的作用.模型在过冷Ni-15％Cu(摩尔分数)合金快速凝固中的应用表明:反向扩散显著影响凝固结束温度但对再辉阶段凝固的固相体积分数影响不明显,与Herlach观点相反,凝固结束温度介于杠杆定律和Scheil方程的预测值之间,且其具体值由反向扩散、初始过冷度和冷却速率决定.
기우평균체적방법건립과랭단상고용체합금적응고동역학모형병연구반향확산재응고동역학과정중적작용.모형재과랭Ni-15％Cu(마이분수)합금쾌속응고중적응용표명:반향확산현저영향응고결속온도단대재휘계단응고적고상체적분수영향불명현,여Herlach관점상반,응고결속온도개우강간정률화Scheil방정적예측치지간,차기구체치유반향확산、초시과랭도화냉각속솔결정.
Departing from the volume-averaging method,an overall solidification kinetic model for undercooled single-phase solid-solution alloys was developed to study the effect of back diffusion on the solidification kinetics.Application to rapid solidification of undercooled Ni-15％Cu (mole fraction) alloy shows that back diffusion effect has significant influence on the solidification ending temperature but possesses almost no effect on the volume fraction solidified during recalescence.Inconsistent with the widely accepted viewpoint of Herlach,solidification ends at a temperature between the predictions of Lever rule and Scheil's equation,and the exact value is determined by the effect of back diffusion,the initial undercooling and the cooling rate.