基于CA-CCA方法定量解析AZ91D镁合金半固态固相率的研究  

Quantitative Analysis of Semi-Solid Magnesium Alloy AZ91D's Solid-Phase Rate Based on CA-CCA Method

作　　者：龚晓叁[1] 吴有伍[2] 

机构地区：[1]厦门理工学院机械工程系,福建厦门361024 [2]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《铸造》2009年第11期1097-1100,共4页Foundry

摘　　要：针对镁合金半固态成形工艺中,初始固相率难以精确确定的问题,以传热学模型和CA-CCA原理为基础,设计制作了一套研究半固态固相率的实验装置,通过实测降温过程中的温度-时间曲线,进行数值解析,实现了半固态固相率与温度定量关系的求解。结果表明,AZ91D合金的固相率对温度的变化极为敏感,且呈非线性关系。当固相率从20%上升至30%时,温度变化仅为6℃左右;而固相率从30%上升至40%时,温度变化仅在7℃左右。因此,对温度进行定量控制是制备高性能AZ91D合金的关键技术之一。The accurate determination of initial solid-phase fraction is difficult for the semisolid forming of magnesium alloys. In the present work, based on heat transfer theory and CA-CCA technology, a kind of experimental apparatus was designed, which could sampling melt temperature- time data and achieve the quantitative relationship between the semisolid solid-phase rate and temperature by numerical analysis. It is shown that the solid-phase rate of AZ91D alloys is sensitive and nonlinear to its temperature. Temperature decreases about only 6 ℃ when the solid-phase rate of the alloys is changed from 20% to 30%, while about 7 ℃ when the solid-phase rate of the alloy changed from 30% to 40%. The results indicate that the accurate temperature-controllable is a.core process for the fabrication of high-quality AZ91D alloys in semisolid forming process.

关 键 词：AZ91D镁合金 半固态成形 固相分数 CA-CCA 

分 类 号：TG249.9[金属学及工艺—铸造]