Microstructure and High Temperature Impression Creep Properties of Mg–3Ca–xZr (x = 0.3, 0.6, 0.9 wt%) Alloys

  • Widyani Darham
  • Ahmad Lutfi Anis
  • Izzul Adli Mohd Arif
  • Nagamothu Kishore Babu
  • Mohamad Kamal Harun
  • Mahesh Kumar Talari
Technical Paper
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Abstract

The current study has investigated the influence of zirconium (Zr) addition to Mg–3Ca–xZr (x = 0.3, 0.6, 0.9 wt%) alloys prepared using argon arc melting on the microstructure and impression properties at 448–498 K under constant stress of 380 MPa. Microstructural analysis of as-cast Mg–3Ca–xZr alloys showed grain refinement with Zr addition. The observed grain refinement was attributed to the growth restriction effect of Zr in hypoperitectic Mg–3Ca–0.3 wt% Zr alloys. Heterogeneous nucleation of α-Mg in properitectic Zr during solidification resulted in grain refinement of hyperperitectic Mg–3Ca–0.6 wt% Zr and Mg–3Ca–0.9 wt% Zr alloys. The hardness of Mg–3Ca–xZr alloys increased as the amount of Zr increased due to grain refinement and solid solution strengthening of α-Mg by Zr. Creep resistance of Mg–3Ca–xZr alloys increased with the addition of Zr due to solid solution strengthening of α-Mg by Zr. The calculated activation energy (Qa) for Mg–3Ca samples (131.49 kJ/mol) was the highest among all alloy compositions. The Qa values for 0.3, 0.6 and 0.9 wt% Zr containing Mg–3Ca alloys were 107.22, 118.18 and 115.24 kJ/mol, respectively.

Keywords

Mg–3Ca Zirconium Grain refinement Impression creep 

Notes

Acknowledgements

Authors acknowledge the financial support provided by Universiti Teknologi MARA, Malaysia during the implementation of this project.

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Copyright information

© The Indian Institute of Metals - IIM 2017

Authors and Affiliations

  • Widyani Darham
    • 1
  • Ahmad Lutfi Anis
    • 1
  • Izzul Adli Mohd Arif
    • 1
  • Nagamothu Kishore Babu
    • 2
  • Mohamad Kamal Harun
    • 1
  • Mahesh Kumar Talari
    • 1
  1. 1.Faculty of Applied SciencesUniversiti Teknologi MARAShah AlamMalaysia
  2. 2.Empa, Swiss Federal Laboratories for Material Science and Technology, Laboratory for Advanced Materials ProcessingThunSwitzerland

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