自孕育法流变压铸2024变形铝合金微观组织特征
Microstructure Characteristics of Rheo-diecasting 2024 Wrought Aluminum Alloy Produced by Self-inoculation Method
窦建文1， 李艳磊1， 李元东1,2， 李 春1
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作者单位：(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， 甘肃 兰州 730050； 2. 兰州理工大学 有色金属合金省部共建教育部重点实验室， 甘肃 兰州 730050)
中文关键字：自孕育法； 2024变形铝合金； 浆料制备； 流变压铸
英文关键字：self-inoculation method; 2024 wrought aluminum alloy; slurry preparation; rheo-die casting
中文摘要：采用自孕育铸造法制备2024变形铝合金半固态浆料，研究了2024变形铝合金半固态浆料的流变压铸成形，并对半固态浆料和压铸件的微观组织进行研究分析。结果表明，自孕育法可制备出组织均匀细小，具有球形或近球形初生相颗粒的半固态浆料。将自孕育法制备半固态浆料通过短时保温后，浆料中初生α (Al)内部无液相夹裹，平均晶粒尺寸为72.5 μm；在增压压力为160 MPa，压射充型速度在2～5 m/s，2024变形铝合金半固态浆料经625 ℃保温3 min后能顺利进行流变压铸，2024铝合金经流变压铸后铸件的微观组织均匀，且铸件性能良好。
英文摘要：Using a novel of self-inoculation method for preparing the semi-solid slurry of 2024 wrought aluminum alloy, the rheo-diecasting processes for 2024 semi-solid slurry were investigated, the microstructure of the semi-solid slurry and die casting was analyzed. The results indicate that the semi-solid slurry with much finer and uniformer primary phase particles is gained by self-inoculation method. The primary α(Al) phase particles are non-entrapped liquid, and the average equivalent diameter is 72.5 μm when semi-solid slurry is held at the semi-solid range temperature for a short time. When the rheo-diecasting parameters are the pressurization of 160 MPa, the injection speed is in 2～5 m/s and is held at 625 ℃ for 3 min, the rheo-diecasting semi-solid castings with homogeneous microstructure and good properties are obtained.