(1. 北京交通大学 机械与电子控制工程学院， 北京 100044；
2. 河北科技大学 材料科学与工程学院， 石家庄 050054)
摘 要: 采用电磁搅拌法制备了具有不同微观组织特征的半固态A356合金浆料，用图像分析软件对浇注前浆料金相试样的初生相微观组织特征进行了测定， 利用间接挤压铸造方法铸造阿基米德螺旋线试样， 以挤压成形后的螺旋线试样长度衡量充型能力， 通过多元回归，建立了半固态A356合金初生相微观组织特征与充型长度之间的数学表达式。 结果表明： 半固态浆料充型能力不仅与初生相微观组织特征参数有关，微观组织特征参数的交互作用对充型能力的影响也较大。 利用该表达式可以对半固态浆料充型能力进行预测， 进而指导半固态浆料制备参数设计、 间接挤压铸造工艺设计和缺陷预测。
关键字: 半固态 A356合金； 挤压铸造； 微观组织； 充型能力
semi-solid A356 alloy on filling ability
（ 1. College of Mechanical and Electronic Control Engineering，
Beijing Jiaotong University，Beijing 100044，China；
2. College of Materials Science and Engineering，
Hebei University of Science and Technology，Shijiazhuang 050054，China）
Abstract: The method of electromagnetic strring was adopted to produce the semi-solid A356 alloy slurry which has different microstructure characteristic, the image analysis software was used to mensurate the microstructure characteristics of the primary phase of slurry metallographic specimen before pouring, and the indirect squeeze casting method was used to produce the archimedean spiral line sample, accordingly the length of spiral line sample after squeeze forming was used to weigh the filling ability, the mathematic representation between the microstructure characteristics of primary phase of semi-solid A356 alloy slurry and filling length via multivariant regression was setup. The result indicates that the filling ability of semi-solid slurry not only has the relation with the microstructure characteristic parameter of primary phase, but is also affected by the interaction of microstructure characteristic parameter greatly. This expression can forecast the filling ability of semi-solid slurry, and then guide the semi-solid slurry produce parameter's design, indirect squeeze casting craft design and failure prediction.
Key words: semi-solid A356 alloy； squeeze casting； microstructure； filling ability
