Journal of the Korean Society of Manufacturing Technology Engineers (한국생산제조학회지)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
권호 표지
DOI QR코드

DOI QR Code

Improvement in Mechanical Properties of AZ91D Mg-Alloy through Thixomolding Process

틱소몰딩 공정을 이용한 AZ91D Mg합금의 기계적 성질 증대

  • Received : 2011.12.31
  • Accepted : 2012.03.15
  • Published : 2012.08.15
Download PDF
⟨ Previous Next ⟩

Abstract

Thixomolding of Mg-alloy is a semi-solid injection molding process utilizing thixotropic phenomenon. Using this process, higher strength, thinner wall section and tighter tolerance without porosity are obtained. It has been applied for production of near-net-shape magnesium component. To design optimal thixomolding process of Mg-alloy part, molding conditions such as slurry temperature, mold temperature and injection time should be determined properly. Selection of these parameters has been dependent upon engineers' experience and intuitiveness. In this paper, to improve mechanical properties of the thixomolded product, optimal selection of process variables such as injection velocity, barrel temperature and die temperature in the process has been studied through microstructural analysis and Taguchi method. Performance of the process is verified through experiments.

Keywords

References

  1. Kainer, K. U., 2003, Magnesium Alloys and Technology, WILEY-VCH, Weinheim, Germany.
  2. Friedrich, H. E., and Mordike, B. L., 2006, Magnesium Technology: Metallurgy, Design Data, Applications, Springer-Verlag, Berlin, Germany.
  3. Kainer, K. U., 2000, Magnesium Alloys and their Applications, WILEY-VCH, Weinheim, Germany.
  4. Avedesian, M. M., and Baker, H., 1999, Magnesium and Magnesium Alloys (ASM Specialty Handbook), ASM International, New York, USA.
  5. Czerwinski, F., Zielinska-Lipiec, A., Pinet, P. J., and Overbeeke, J., 2001, "Correlating the Microstructure and Tensile Properties of a Thixomolded AZ91D Magnesium Alloy," Acta Materialia, Vol. 49, No. 7, pp. 1225-1235. https://doi.org/10.1016/S1359-6454(01)00015-5
  6. Fan, Z., 2002, "Semi-solid Metal Processing," International Materials Reviews, Vol. 47, No. 2, pp. 49-85. https://doi.org/10.1179/095066001225001076
  7. Kim, H., and Chung, S. C., 2008, "Optimal Design of Process Parameters for Flatness Improvement in Semisolid Casting Processes," Transactions of the Korean Society of Machine Tool Engineers, Vol. 17, No. 6, pp. 28-34.
  8. Zhang, Y. F., Liu, Y. B., Cao, Z. Y., Zhang, Q. Q., and Zhang, L., 2009, "Mechanical Properties of Thixomolded AZ91D Magnesium Alloy," Journal of Materials Processing Technology, Vol. 209, No. 3, pp. 1375-1384. https://doi.org/10.1016/j.jmatprotec.2008.03.059
  9. Song, I. H., and Chung, S. C., 2009, "Robust Design of the Gate System for Flatness Improvement in Semi-Solid Casting Processes," Transactions of the Korean Society of Machine Tool Engineers, Vol. 18, No. 2, pp. 130-136.
  10. Park, S. H., 2001, Modern Design of Experiments, Minyoungsa, Seoul, Korea.
  11. Shin, D. S., and Chung, S. C., 2011, "2.5D Quick Turnaround Engraving System through Recognition of Boundary Curves in 2D Images," Journal of Manufacturing Engineering & Technology, Vol. 20, No. 4, pp. 369-375.