不同压铸工艺对AE44镁合金的影响  

Effects of Different Die Casting Processes on AE44 Magnesium Alloy

作　　者：李俊杰 马超胜 张通通 于文波 熊守美[2] Li Junjie;Ma Chaosheng;Zhang Tongtong;Yu Wenbo;Xiong Shoumei(School of Mechanical and Electronic Control Engineering,Beijing Jiaotong University,Beijing 100091;School of Materials Science and Engineering,Tsinghua University,Beijing 100084)

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100091 [2]清华大学材料学院,北京100084

出　　处：《特种铸造及有色合金》2024年第5期647-655,共9页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(52175284)。

摘　　要：为了解AE44镁合金高压压铸件的工艺-组织-力学性能之间的关系,对不同工艺参数下生产的高压压铸件进行了三维重构和二维表征。微观结构表征表明,收缩孔的形成与压室预结晶(ESCs)密切相关,主要受压室内低慢射速度和快慢射速度控制。铸造压力可以通过提高液态金属的供料能力,显著降低心部的孔隙率。充填过程模拟表明,棒状试样中心位置先充填,其后是近浇口位置,并伴有一次强烈的紊流。拉伸试验表明,撕裂脊主要由ESCs的滑移带演化而来。ESCs的数量和分布决定了铸件的断裂行为。To understand the relationship between process-microstructure-mechanical properties of AE44 magnesium alloy high-pressure die castings,three-dimensional reconstruction and two-dimensional characterization were per⁃formed on high-pressure die castings produced under different process parameters.The microstructure characterization indicates that the formation of shrinkage pores is closely related to ESCs,which is mainly controlled by low and slow injection rates in the compression chamber and fast and slow injection rates.Casting pressure can significantly reduce the porosity of the core by increasing the feeding capacity of liquid metal.The simulation of the filling process shows that the central position of the bar sample is filled firstly,followed by the position near the gate,and accompanied by a strong turbulence.The tensile fracture indicates that the tearing ridges mainly evolve from the slip bands of ESCs.The quantity and distribution of ESCs determine the fracture behavior of castings.

关 键 词：AE44镁合金 高压压铸 三维重构 ESCS 断裂行为 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG249.2[金属学及工艺—金属材料]