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The effect of different high pressure die casting parameters on 3D microstructure and mechanical properties of AE44 magnesium alloy

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Journal of Magnesium and Alloys 2023年第9期11卷 3141-3150页

作者： Tong-tong Zhang Wen-bo Yu Chao-sheng Ma Wan-tong Chen Lin Zhang Shou-mei Xiong Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China China Academy of Machinery Science and Technology Group Co. LtdBeijing 100044China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

To understand the relationship between the process-microstructure-mechanical properties of the high-pressure die-casting(hpdc) AE44 magnesium alloy, 3D reconstruction and 2D characterization were carried out on the hpdc castings produced with different process parameters(low slow-shot speed, fast slow-shot speed, solidification pressure). Microstructural characterization revealed that the formation of shrinkage pores are closely related to ESCs, which were mainly controlled by the low slow-shot speed in shot sleeve(ESCs growth time) and fast slow-shot speed into the die cavity(distribution of ESCs). In addition, solidification pressure can significantly reduce the shrinkage porosity in the center by improving the feeding capacity of liquid metal. Tensile fracture revealed that the tearing ridge is mainly evolved from the slip band of ESCs. The quantity and distribution of ESCs determine the fracture mode of castings. The relationship between mechanical properties of castings and the morphology of ESCs and porosity is also statistically discussed.

关键词： hpdc parameters Porosity Externally solidified crystals(ESCs) Tensile fracture 3D reconstruction

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The effect of slow shot speed and casting pressure on the 3D microstructure of high pressure die casting AE44 magnesium alloy

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Journal of Magnesium and Alloys 2023年第2期11卷 753-761页

作者： Chaosheng Ma Wenbo YU Tongtong Zhang Zihua Zhang Yihu Ma Shoumei Xiong Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Research Center of Rail Vehicles Safety Monitoring and Health Management Beijing Jiaotong UniversityBeijing 100044China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

3D reconstruction and 2D observation were conducted to characterize the microstructure of the castings produced through high pressure die casting with different *** results indicate that shrinkage pores generally co-existed with externally solidiﬁed crystals(ESCs).In specimen produced without fast slow shot speed,big net-shrinkage pores accompanied with ESCs were found in the center of the *** the casting pressurization was introduced,the shrinkage pores gathered to the specimen center and became much less due to the optimization of melt *** more porosity was found near the gate rather than in the middle of the rod bar,especially gas ***ﬁlling process simulation reveals that the middle position of the bars wasﬁrstlyﬁlled and followed by the near gate position accompanied with one intense turbulentﬂow.

关键词： hpdc parameters Externally solidiﬁed crystals(ESCs) Porosity 3D reconstruction.

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维普期刊数据库

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Influence of different high pressure die casting processes on 3D porosity distribution of Mg-3.0Nd-0.3Zn-0.6Zr alloy

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China Foundry 2021年第6期18卷 521-528页

作者： Yi-hu Ma Wen-bo Yu Yu-qi Zhou Shou-mei Xiong Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

3D reconstruction was adopted to characterize the microstructural morphologies of Mg-3.0Nd-0.3Zn-0.6Zr alloy castings produced by high pressure die casting(hpdc)processes with different parameters,including low slow-shot speed,solidification pressurization and fast slow-shot *** low slow-shot speeds of 0.1 m·s^(-1),0.2 m·s^(-1) and 0.3 m·s^(-1),the porosity is concentrated in the center of the castings with one spiral staggered shape along the liquid flow *** porosity volume simultaneously decreases with the reduction of quantity and size of externally solidified crystals(ESCs),while the shrinkage pores become more and more dispersed with the increasing low slow-shot *** not only reduces the porosity volume due to the improvement of feeding ability,but also transformes the center gathered porosity into one layer-by-layer distribution *** with the increasing fast slow-shot speed,the central porosity dramatically decreases and transforms into a large-scale spiral staggered shape along the liquid flow ***,the porosity is much more dispersed when the speed is increased from 2 m·s^(-1) to 3 m·s^(-1).

关键词： hpdc parameters porosity volume 3D morphology

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