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23卷    第11期    总第176期    2013年11月

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文章编号:1004-0609(2013)11-3015-09
2024变形铝合金半固态浆料在连续冷却和保温过程中的组织演变
李元东1, 2,刘兴海1,李艳磊1,索江龙1,周宏伟1,张心龙1

(1. 兰州理工大学 甘肃省有色金属新材料省部共建国家重点实验室,兰州 730050;
2. 兰州理工大学 有色金属合金及加工教育部重点实验室,兰州 730050
)

摘 要: 采用液淬法研究2024变形铝合金半固态浆料在连续冷却和不同温度保温过程中的组织演变。结果表明:在连续冷却过程中,浆料固相率、初生固相颗粒尺寸及形状因子均随温度降低而连续增大;不同温度保温时,浆料固相率在对应值作微小波动,初生固相颗粒尺寸连续增大,形状因子先减小后增大,最后减小到1.3~1.4之间。连续冷却前期浆料固相率的增加主要受固相颗粒的析出控制,而后期主要由固相颗粒的长大控制。保温过程中浆料组织演变可分为聚集组织分解、颗粒合并粗化和颗粒熟化3个阶段,初生固相颗粒的长大规律符合动力学方程 。

 

关键词: 2024 变形铝合金;半固态;浆料;连续冷却;保温;组织演变

Microstructure evolutions of semisolid slurry of 2024 wrought aluminum alloy during continuous cooling and isothermal holding
LI Yuan-dong1, 2, LIU Xing-hai1, LI Yan-lei1, SUO Jiang-long1, ZHOU Hong-wei1, ZHANG Xin-long1

1. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials,
Lanzhou University of Technology, Lanzhou 730050, China;
2. Key Laboratory of Non-ferrous Metal Alloys and Processing, Ministry of Education,
Lanzhou University of Technology, Lanzhou 730050, China

Abstract:The microstructure evolutions of 2024 wrought aluminum alloy slurry during continuous cooling and isothermal holding were investigated by a simple technique of water quenching. The results show that during the continuous cooling course, the solid fraction, average particle size and shape factor increase continuously with temperature decreasing. While during the isothermal holding stage, the solid fraction of the slurry fluctuates at the corresponding values, the particle size of the primary solid phase increases continuously, and the shape factor decreases firstly, then increases and finally decreases to a value between 1.3 and 1.4. The increase of solid fraction during continuous cooling is dominated mainly by the precipitation of solid-phase particles in the early stage, and by the growth of solid-phase particles at last. The evolution process of isothermal holding can be divided into three steps: disaggregation of the chain structure, mergence and coarsening, and the final ripening of primary particles. These primary solid particles grow by obeying the kinetic law in the whole isothermal holding process.

 

Key words: 2024 wrought aluminum alloy; semi-solid; slurry; continuous cooling; isothermal holding; micro-structure evolution

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

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

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