CAJ | 학술논문

采用改进的Miedema模型和Eyring模型,对Al-2%Cu合金的液相扩散系数进行理论计算,建立了二元合金液相扩散系数的理论计算模型,解决实验难以测量液相扩散系数导致数据匮乏的难题.在Eyring模型中,引入液态合金黏度—时间的变化曲线,替代原模型中的溶剂黏度数值,以进一步提高计算结果的准确性.在微观组织模拟中,基于常规恒定液相扩散系数模拟结果的柱状晶比例为20.1%,而基于本研究计算所得的液相扩散系数曲线模拟结果的柱状晶比例为64.8%,更接近实验测得的柱状晶比例58.1%,很好地验证了液相扩散系数理论计算模型的可行性和准确性.
채용개진적Miedema모형화Eyring모형,대Al-2%Cu합금적액상확산계수진행이론계산,건립료이원합금액상확산계수적이론계산모형,해결실험난이측량액상확산계수도치수거궤핍적난제.재Eyring모형중,인입액태합금점도—시간적변화곡선,체대원모형중적용제점도수치,이진일보제고계산결과적준학성.재미관조직모의중,기우상규항정액상확산계수모의결과적주상정비례위20.1%,이기우본연구계산소득적액상확산계수곡선모의결과적주상정비례위64.8%,경접근실험측득적주상정비례58.1%,흔호지험증료액상확산계수이론계산모형적가행성화준학성.
The liquid phase diffusion coefficient of Al-2%Cu alloy was calculated with the modified Miedema model and Eyring model, to further improve the accuracy. The mathematical model of liquid phase diffusion coefficient in binary alloy was established to resolve the lack of liquid phase diffusion coefficient data that are difficult to measure in the experiment. Instead of the solvent viscosity value, the viscosity—temperature curve of liquid alloy was introduced into the Eyring model to increase the accuracy of calculation. In the microstructure simulation, the simulated proportion of columnar grains based on the normal constant liquid phase diffusion coefficient is 20.1%? while the proportion of columnar grains based on the calculated liquid phase diffusion coefficient with the developed model is 64.8%, which is much closer to the experimental result of 58.1%, indicating that the mathematical model of liquid phase diffusion coefficient is feasible and accurate.