Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第13卷    第6期    总第57期    2003年12月

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文章编号:1004-0609(2003)06-1488-06
两相区铸造AZ91D半固态坯料的部分
重熔工艺与组织演变
乐启炽, 崔建忠, 路贵民, 欧  鹏

(东北大学 材料电磁过程研究教育部重点实验室,沈阳 110004)

摘 要: 对在两相区铸造进行半固态制浆所得AZ91D镁合金坯料的部分重熔工艺条件及组织演变进行了研究。结果表明: AZ91D镁合金在两相区温度(585℃)静置30min且在水冷铁模中浇注的两相区铸造半固态坯料, 在575℃下保温30~45min进行部分重熔时, 其组织具有固相颗粒球化程度高、 颗粒细小且粒度均匀、有效液相体积分数高等特点; 坯料组织演变初始化阶段、 球化阶段和集聚合并长大等3阶段部分相互重叠。 对特定原始半固态坯料, 改变部分重熔温度, 可缩短重叠区, 扩大球化区, 实现坯料重熔进程及组织形态的优化,从而增加工艺可控性和提高坯料的触变性。

 

关键字: 镁合金; 半固态浆料; 两相区铸造; 微观组织

Microstructure evolution and partially remelting processing of 
two-phase-region casting AZ91D semisolid slurry ingot
LE Qi-chi, CUI Jian-zhong, LU Gui-min, OU Peng

Key Laboratory of Ministry of Education for Electromagnetic Processing of Materials,
Northeastern University, Shenyang 110004, China

Abstract:The microstructure evolution and partially remelting processing of two-phase-region casting AZ91D magnesium alloy ingots were investigated. The result indicates that the semisolid feedstock cast by held at two-phase-region temperature (585℃) for 30min and then poured in water-cooled-iron mould, as is remelted at 575℃ for 30~45min, refining and homogeneous solid grains with higher spheroidization degree and higher effective liquid volume fraction can be obtained. The microstructure evolution stages of the feedstock include initial stage, spheroidizing stage, and grouping and merging stage, which partially overlap with each other. For the special original semisolid ingot, the spheroidizing stage can be enlarged and the overlap bands can be narrowed through varying remelting temperature, therefore, the optimum microstructure feature and remelting processing will be realized, which will be beneficial to improve the process controllability and the thixoforming property of feedstock.

 

Key words: magnesium alloy; semisolid slurry; two-phase-region casting; microstructure

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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