半固态AZ91D合金暂态流变特性的研究  

Research on the Rheological Properties of Semi-solid AZ91D Alloy in Transient

作　　者：李永磊[1] 鞠丽平[1] 赵敬红[1] 

机构地区：[1]沈阳航空航天大学理学院,沈阳110136

出　　处：《机械工程师》2016年第1期49-51,共3页Mechanical Engineer

摘　　要：文中以Chen-Fan模型为基础对其表达式中关于解聚率和碰撞率的表达式做出符合实际的修改,并将修改后的模型应用于半固态AZ91D镁合金暂态过程的研究。首先将半固态A Z91D镁合金浆料静置一段时间后,分别从浆料中各固相粒子之间发生聚合和解聚两个方面观察其处于暂态过程时的表观黏度变化。然后通过研究发现当再次施加某一剪切速率时,半固态浆料的表观黏度值会急剧下降直至稳定到某一固定数值,表现出典型的剪切变稀即触变性。这对于半固态金属浆料的充型十分重要。Based on the Chen- Fan model, this paper modifies the expression of deagglomeration rate and the expression of collision rate to conform to the actual situation, and applies the modified model to research the semi-solid AZ91 D magnesium alloy in the transient process. Firstly,we set semi-solid AZ91 D magnesium alloy slurry standing for a period of time, the apparent viscosity will be observed from two aspects of agglomeration and deagglomeration of the solid particles in transient process. When applying a shearing rate once again, the apparent viscosity of semi-solid slurry will fall sharply until stable to constant value, it shows the typical shear thinned or thixotropic which is very important for the filling of semi-solid metal slurry.

关 键 词：Chen-Fan模型 聚合 解聚 表观黏度 充型 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG113.1[金属学及工艺—金属材料]