Semi-Solid Aluminum Alloy Slurry for Rheocasting


To reduce the cost of preparing a semi-solid slurry, grain shape must be refined and improved by controlling the pouring temperature or using a low pouring temperature.


LIU ZHENG, MATERIAL AND CHEMICAL ENGINEERING INSTITUTE OF JIANGXI UNIVERSITY OF SCIENCE AND TECHNOLOGY, GANZHOU, CHINA; MAO WEIMING, MATERIALS SCIENCE AND ENGINEERING INSTITUTE OF BEIJING UNIVERSITY OF SCIENCE AND TECHNOLOGY, BEIJING


复合工艺制备流变铸造半 固态铝合金浆料


为了降低制备半固态浆料过程中的生产成本，人们已意识到可以通过控制浇注温 度或利用低温浇注技术来细化晶粒尺寸或改善晶粒形貌。


刘政江西理工大学材料与化学工程学院，赣州341000 毛卫民北京科技大学材料科学与工程学院，北京100083


R


heocasting was developed as a new cast- ing technique which involves stirring the alloy continuously during solidification or maintaining an isothermal state to produce


semi-solid slurry, which is injected directly into the die. To save the cost of preparing the semi-solid slurry, grain shape must be refined and improved by controlling the pouring temperature or using a low pouring temperature. Because of the solidifying characteristic of alloy and the difference in thermo-conduction of the mold, the liquid alloy could have varying cooling rates throughout the mold resulting


半 固态浆


料过程中的生产成本，人们已意识到可以通过控制 浇注温度或利用低温浇注技术来细化晶粒尺寸或改善 晶粒形貌。但是由于合金的凝固特性以及铸型热传导 的差异，铸型中的液态合金因各部位存在明显的温度


Fig. 1. Shown is mi- crostructure in central area at different posi- tions of top (a) mid (b) and bottom (c).


固态合金浆料的制备是半固态成形技术的 基础和关键，它要求浆料原始组织为均匀 细小的球形非枝晶组织。为了降低制备半


a


b


c


图1 复合工艺制备 的A356半固态浆 料铸锭不同部位的 心部组织


42 | FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION May 2013


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