半固态挤压铸造Al-Si-Mg-Fe合金的组织与性能  

Microstructure and Properties of Semi-solid Squeeze Casting Al-Si-Mg-Fe Alloys

作　　者：刘岩 高民强 杨莉[2] 陈谦稳 陈海伟 管仁国 Liu Yan;Gao Minqiang;Yang Li;Chen Qianwen;Chen HaiWei;Guan Renguo(School of Materials Science and Engineering,Northeastern University;Key Laboratory of Near-Net Forming of Light Metals of Liaoning Province,Dalian Jiaotong University;Suzhou Jincheng Precision Die Casting Co.,Ltd.)

机构地区：[1]东北大学材料科学与工程学院,沈阳110819 [2]大连交通大学辽宁省轻质金属材料近净成形重点实验室 [3]苏州金澄精密铸造有限公司

出　　处：《特种铸造及有色合金》2023年第6期747-752,共6页Special Casting & Nonferrous Alloys

基　　金：国家重点研发计划资助项目(2022YFE0137900);大连市高层次人才创新支持计划资助项目(2021RD06)。

摘　　要：采用剪切、振动耦合亚快速凝固制浆技术获得Al-Si-Mg-Fe合金半固态浆料,并通过优化挤压铸造工艺参数,制备出高性能挤压铸件。研究了浇注温度和挤压压力对半固态挤压铸件组织与力学性能的影响。结果表明,随着浇注温度从690℃降低至670℃,初生α-Al晶粒直径减小,形状因子增加,孔隙率降低,铸件的力学性能明显提高;随着挤压压力从100 MPa增至120 MPa,初生α-Al晶粒变得细小、圆整,铸件的力学性能提升明显,进一步增加挤压压力至140 MPa时,铸件组织和力学性能的变化不明显。T6热处理后,铸件的力学性能得到进一步提高。Al-Si-Mg-Fe alloy slurry was prepared by sub-rapid solidification slurrying technology combined with shear and vibration.The high-performance squeeze castings were manufactured by optimizing process parameters.Effects of pouring temperature and squeeze casting pressure on the microstructure and mechanical properties of semi-solid squeeze casting Al-Si-Mg-Fe alloys were investigated.The results indicate that when the pouring temperature is decreased from 690℃to 670℃,the average grain size of primaryα-Al grains is decreased,howerer average factor shape is increased,while porosity is decreased,where the mechanical properties of castings are significantly enhanced.Furthermore,primaryα-Al grains are obviously refined and spheroidized with squeeze pressure increasing from 100 MPa to 120 MPa,leading to the rise in mechanical properties.When the squeeze casting pressure is further increased to 140 MPa,the change of microstructure and mechanical properties of castings can be ingnored.After T6 heat treatment,mechanical properties of castings are further raised.

关 键 词：Al-Si-Mg-Fe合金 半固态挤压铸造 浇注温度 挤压压力 T6处理 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG249.26[金属学及工艺—金属材料]