Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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A Study on the Die-casting Process of AM50 Magnesium Alloy

AM50 마그네슘 합금의 다이캐스팅 공정에 관한 연구

  • Kim, Soon-Kook (Dept. of Materials Science and Engineering, Donga University) ;
  • Jang, Chang-Woo (Dept. of Materials Science and Engineering, Donga University) ;
  • Lee, Jun-Hee (Dept. of Materials Science and Engineering, Donga University) ;
  • Jung, Chan-Hoi (Dept. of Materials Science and Engineering, Donga University) ;
  • Seo, Yong-Gwon (Dept. of Mechanical Engineering, Donga University) ;
  • Kang, Choong-Gil (Dept. of Mechanical Engineering, Busan University)
  • Published : 2006.08.27
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Abstract

In recent years, Magnesium (Mg) and its alloys have become a center of special interest in the automobile industry. Due to their high specific mechanical properties, they offer a significant weight saving potential in modern vehicle constructions. Most Mg alloys show very good machinability and processability, and even the most complicated die-casting parts can be easily produced. The die casting process is a fast production method capable of a high degree of automation for which certain Mg alloys are ideally suited. In this study, step-dies and flowability tests for AM50 were performed by die-casting process according to various combination of casting pressure and plunger velocity. We were discussed to velocity effect of forming conditions followed by results of microstructure, FESEM-EDX, hardness and tensile strength. Experimental results represented that the conditions of complete filling measured die-casting pressure 400 bar, 1st plunger velocity 1.0 m/s and 2nd plunger velocity 6.0 m/s. The increasing of 2nd plunger velocity 4.0 to 7.0 m/s decreased average grain size of $\alpha$ phase and pore. It was due to rapid filling of molten metal, increasing of cooling rate and pressure followed by increased 2nd plunger velocity. The pressure should maintain until complete solidification to make castings of good quality, however, the cracks were appeared at pressure 800bar over.

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  1. Microstructure and Mechanical Properties at Room and Elevated Temperatures in AM50-0.3 wt%CaO Alloy vol.22, pp.10, 2012, https://doi.org/10.3740/MRSK.2012.22.10.499