CAJ | 학술논문

研究一种多元合金的非等温相场模型，定量地模拟工业多元合金的真实凝固过程，结合热力学和扩散迁移率的数据来预测整个系统中的相平衡、溶质扩散系数、比热容和放出的潜热。结果表明：这些参数不是常数，它们的值与成分和温度有关。没有这些参数，定量模拟多元合金的凝固几乎是不可能。在这个模型中，界面区域假设是由有同样化学势的固相和液相混合而成的，但组成不同。这个模型中同样考虑反溶质截流。一并将模型应用到工业Al?Cu?Mg合金的各向枝晶自由长大的凝固过程。
연구일충다원합금적비등온상장모형，정량지모의공업다원합금적진실응고과정，결합열역학화확산천이솔적수거래예측정개계통중적상평형、용질확산계수、비열용화방출적잠열。결과표명：저사삼수불시상수，타문적치여성분화온도유관。몰유저사삼수，정량모의다원합금적응고궤호시불가능。재저개모형중，계면구역가설시유유동양화학세적고상화액상혼합이성적，단조성불동。저개모형중동양고필반용질절류。일병장모형응용도공업Al?Cu?Mg합금적각향지정자유장대적응고과정。
In order to quantitively model the real solidification process of industrial multicomponent alloys, a non-isothermal phase field model was studied for multicomponent alloy fully coupled with thermodynamic and diffusion mobility database, which can accurately predict the phase equilibrium, solute diffusion coefficients, specific heat capacity and latent heat release in the whole system. The results show that these parameters are not constants and their values depend on local concentration and temperature. Quantitative simulation of solidification in multicomponent alloys is almost impossible without such parameters available. In this model, the interfacial region is assumed to be a mixture of solid and liquid with the same chemical potentials, but with different composition. The anti-trapping current is also considered in the model. And this model was successfully applied to industrial Al?Cu?Mg alloy for the free equiaxed dendrite solidification process.