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Metallurgical and Materials Transactions A

, Volume 45, Issue 12, pp 5767–5776 | Cite as

Mechanical Strength and Failure Characteristics of Cast Mg-9 pctAl-1 pctZn Alloys Produced by a Heated-Mold Continuous Casting Process: Tensile Properties

  • Mitsuhiro OkayasuEmail author
  • Shuhei Takeuchi
  • Hiroaki Ohfuji
Article

Abstract

The mechanical properties and failure characteristics of a cast Mg alloy (AZ91: Mg-Al8.9-Zn0.6-Mn0.2) produced by a heated-mold continuous casting process (HMC) are investigated. In a modification of the original HMC process, the cooling of the liquid alloy by direct water spray is carried out in an atmosphere of high-purity argon gas. The HMC-AZ91 alloy exhibits excellent mechanical properties (high strength and high ductility) that are about twice as high as those for the same alloy produced by conventional gravity casting. The increased material strength and ductility of the HMC sample are attributed to nanoscale and microscale microstructural characteristics. The fine grains and tiny spherical eutectic structures (e.g., Mg17Al12 and Al6Mn) distributed randomly in the matrix of the HMC alloy result in resistance to dislocation movement, leading to high tensile strength. Basal slip on (0001) planes in the relatively organized crystal orientation of the HMC alloy, as well as grain boundary sliding through tiny spherical eutectic structures, results in high ductility. Details of the failure mechanism under static loading in the HMC alloy are also discussed using failure models.

Keywords

Crystal Orientation Basal Slip Squeeze Casting Gravity Casting AZ91 Sample 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was supported by a grant (Grant-in-Aid for Scientific Research (C), 2014) from the Japanese Government (Ministry of Education, Science, Sports and Culture) and Ehime University.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2014

Authors and Affiliations

  • Mitsuhiro Okayasu
    • 1
    Email author
  • Shuhei Takeuchi
    • 1
  • Hiroaki Ohfuji
    • 2
  1. 1.Department of Materials Science and EngineeringEhime UniversityMatsuyamaJapan
  2. 2.Geodynamics Research CenterEhime UniversityMatsuyamaJapan

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