镁合金AZ91D半固态浆料暂态流变行为理论初探  

Theoretical Research on Transient-state Rheological Behavior of Semisolid Slurries of Magnesium Alloy AZ91D

作　　者：李亮[1] 郑冕[1] 

机构地区：[1]辽宁工业大学理学院,辽宁锦州121001

出　　处：《辽宁工业大学学报（自然科学版）》2016年第6期393-396,400,共5页Journal of Liaoning University of Technology(Natural Science Edition)

摘　　要：应用半固态金属浆料微结构模型研究镁合金AZ91D类液态半固态浆料的暂态流变行为,发现镁合金AZ91D半固态浆料暂态流变行为与其微结构具有较强关联,浆料触变性的微观根源在于聚集体的解聚速度远大于聚集速度。同时针对滞回环进行理论计算,结果表明:半固态AZ91D的触变性随最大剪切率和浆料静置时间增大而增大,随原初剪切速率和剪切速率上升时间及下降时间的增大而减小。In this paper, a microstructure model is used to predict transient-state rheological behavior of the semisolid magnesium alloy AZ91D slurry. It is found from the calculations that there is a strong coupling between the transient-state rheological behavior and the microstrucmre of slurries. And the thixotropy root is the fact that deagglomeration is much faster than agglomeration; and in addition, the results indicate that the thixotropy degree increases with the maximum shear rate and the isothermal resting time; whereas it decreases with the initial shear rate, the rising time and the falling time of shear rate.

关 键 词：半固态 流变学 触变性 微结构 

分 类 号：TG146.2[一般工业技术—材料科学与工程]