强制对流搅拌流变压铸AZ91D镁合金的组织与性能

发布时间：2018-06-17 03:05

本文选题：AZD镁合金 + 强制对流搅拌　；参考：《金属学报》2015年06期

【摘要】：依据强制对流搅拌原理,成功自主研制出强制对流搅拌(FCM)制浆设备,并与压铸机相结合,以AZ91D镁合金力学拉伸件为例,实现了浆料制备、输送到成形的一体化流变压铸过程;研究了不同FCM工艺参数下流变压铸件组织特征的演变;对比了不同工艺下压铸件力学性能的差异;并分析了FCM流变压铸工艺组织形成机理及凝固行为.结果表明:FCM工艺参数对铸件的显微组织有较大影响,适当提高螺杆转速或降低筒体温度,均有利于成形件组织形貌的改善;FCM流变压铸工艺不仅可以获得内部组织细小、圆整且分布均匀的成形件,而且可以显著提高成形件的力学性能;与传统压铸件相比,FCM流变压铸件的屈服强度变化不大,抗拉强度和延伸率分别提高了12.5%和80.0%;与经T4和T6热处理的铸件相比,铸态拉伸件的抗拉强度最低,屈服强度和伸长率介于T4和T6之间.
[Abstract]:According to the principle of forced convection agitation, the paper successfully developed the forced convection agitation (FCM) pulping equipment, and combined with the die casting machine, taking the mechanical elongation of AZ91D magnesium alloy as an example, the slurry preparation was realized and transported to the integrated rheological die-casting process of forming. The evolution of the microstructure characteristics of rheological die castings under different FCM process parameters was studied, the mechanical properties of die castings under different processes were compared, and the formation mechanism and solidification behavior of FCM rheological die casting process were analyzed. The results show that the microstructures of castings are greatly affected by the technological parameters of FCM, and the proper increase of screw rotation speed or the lowering of barrel temperature are beneficial to the improvement of the microstructure of forming parts. The internal microstructure can not only be obtained by FCM rheological die casting process, but also by increasing the rotating speed of screw or lowering the temperature of the tube. The mechanical properties of the formed parts can be improved significantly by the round and evenly distributed forming parts, and the yield strength of the FCM rheological die castings has little change compared with the traditional die castings. The tensile strength and elongation were increased by 12.5% and 80.0%, respectively, and the tensile strength of as-cast elongation was the lowest, and the yield strength and elongation were between T4 and T6 compared with the castings treated with T4 and T6.
【作者单位】：北京科技大学材料科学与工程学院;
【基金】：国家重点基础研究发展计划项目2011CB606302 国家高技术研究发展计划项目2013AA031001~~
【分类号】：TG146.22;TG249.2

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