摘要
利用一个垂直的定向凝固装置,研究了Al-6wt%Cu合金在温度梯度约12K/mm条件下,糊状区在保温不同时间并激冷后得到的微观组织及成分分布特征.SEM/EDX分析表明,糊状区在保温时间内将发生自发的、以扩散机制为主的、类似TGZM效应的凝固过程.完全凝固后所形成的成分梯度与温度梯度的对应关系对于预测定向凝固过程中固液相界面温度以及相平衡测定具有重要意义.
After different holding time, the quenched microstructure and concentration distribution of Al -6. 0wt% Cu alloy in the former mushy zone under temperature gradient of 12 K/mm were studied with a vertical directional solidification apparatus. SEM/EDX analysis shows that a diffusion-controlled solidification process starts spontaneously with the same mechanism as TGZM effect. Thus the relationship between temperature gradient and concentration gradient after complete solidification can be of great significance for determination of interfacial temperature during directional solidification and determination of phase equilibria.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2009年第1期118-121,共4页
Materials Science and Technology
基金
江苏大学高级技术人才科研启动基金资助项目(04JDG029)
关键词
温度梯度
糊状区
凝固
temperature gradient
mushy zone
solidification
