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Investigations on the microstructure, mechanical, corrosion and wear properties of Mg–9Al–xGd (0, 0.5, 1, and 2 wt%) alloys

Published online by Cambridge University Press:  05 September 2017

Karuna Ratnakaran Athul ,
Amirthalingam Srinivasan  and
Uma Thanu Subramonia Pillai
Karuna Ratnakaran Athul
Affiliation:
Materials Science and Technology Division, National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific & Industrial Research, Thiruvananthapuram 695019, India
Amirthalingam Srinivasan
Affiliation:
Materials Science and Technology Division, National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific & Industrial Research, Thiruvananthapuram 695019, India
Uma Thanu Subramonia Pillai*
Affiliation:
Materials Science and Technology Division, National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific & Industrial Research, Thiruvananthapuram 695019, India
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Magnesium alloys with the lowest structural density exhibit unique applications in the automotive and aerospace fields. Rare earth addition is a promising method to enhance the mechanical properties of the Mg alloys. In the present study, the magnesium–aluminium (Mg–9Al) alloy containing varying wt% of gadolinium (Gd) is synthesized using the casting technique. The microstructure, mechanical, corrosion, and wear properties of the developed Mg–9Al–xGd alloy are evaluated and compared to the base Mg–9Al alloy. Microstructural investigation shows significant grain refinement and the presence of Al2Gd in addition to β-Mg17Al12 in the Gd-added alloys. Under tensile loads, the developed Mg–9Al–2Gd alloy exhibits enhancements in ultimate and yield strengths. The corrosion resistance of the alloys is found to increase with increasing Gd content and is optimal at 2 wt%. Considering the higher hardness and dispersity of the Al2Gd phase, Mg–9Al–2Gd has exhibited a higher wear resistance than that of the as-cast Mg–9Al alloy.

Keywords

Mghardnesscorrosion
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 19 , 16 October 2017 , pp. 3732 - 3743
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Amit Bandyopadhyay

References

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