匀速加热过程中第二相的扩散溶解  

DISSOLUTION OF THE SECOND PHASE DURING CONTINUOUS HEATING PROCESS

作　　者：王晓颖[1] 张瑞杰[2] 介万奇[2] 

机构地区：[1]西北工业大学凝固技术国家重点实验 [2]西北工业大学凝固技术国家重点实验室,西安710072

出　　处：《金属学报》2004年第4期434-438,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金资助项目59930130

摘　　要：通过求解匀速升温条件下的扩散方程,建立了匀速加热过程中扩散控制的第二相溶解模型,给出了基体中的溶质分布及第二相溶解速度的解析表达式.以Al-5.8％Cu合金为例的计算结果表明,第二相的形态和加热速率显著影响基体中的溶质分布和第二相的溶解速度. Al-5.8％Cu合金的热分析和液淬实验结果验证了所建模型的合理性.A dissolution model of the plate-like and spherical second phases in the multiphase alloy during continuous heating process with constant rate has been proposed. The effects of heating rate and interface curvature on the concentration profiles in the matrix and the dissolution rate of the second phase were discussed. The model was applied to calculate the dissolved fraction of the second phase before melting during heating process. The calculated results for Al-5.8%Cu alloys, where the eutectic melting fraction of the non-equilibrium eutectic was determined by DSC analysis, agree well with the experimental ones, clearly indicating the validity of the developed model.

关 键 词：匀速加热过程 加热速率 扩散 第二相 溶解 

分 类 号：TG111.6[金属学及工艺—物理冶金]