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Grain-Refined AZ92 Alloy with Superior Strength and Ductility

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Abstract

Grain-refined AZ92 (GR-AZ92) alloy with superior tensile properties is developed by adding 1 wt% Zn and a very small amount of SiC (0.17 wt%) to commercial AZ91 alloy for enhancing the solid-solution strengthening effect and refining the crystal grains, respectively. The homogenized GR-AZ92 alloy with an average grain size of 91 μm exhibits a tensile yield strength (TYS) of 125 MPa, ultimate tensile strength (UTS) of 281 MPa, and elongation of 12.1%, which are significantly higher than those of AZ91 alloy with a grain size of 420 μm (TYS of 94 MPa, UTS of 192 MPa, and elongation of 7.0%). The peak-aging time of GR-AZ92 alloy (8 h) is significantly shorter than that of AZ91 alloy (32 h) owing to a larger amount of grain boundaries in the former, which serve as nucleation sites of Mg17Al12 precipitates. A short-aging treatment for less than 1 h of the GR-AZ92 alloy causes an effective improvement in its strength without a significant reduction in its ductility. The 30-min-aged GR-AZ92 alloy has an excellent combination of strength and ductility, with a TYS of 142 MPa, UTS of 304 MPa, and elongation of 8.0%.

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Acknowledgements

This work was supported by the National Research Foundation of Korea Grant funded by the Korea government (MSIP, South Korea) (Nos. 2016R1C1B2012140 and 2017R1A4A1015628).

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Correspondence to Sung Hyuk Park.

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Lee, J.U., Kim, SH., Jo, WK. et al. Grain-Refined AZ92 Alloy with Superior Strength and Ductility. Met. Mater. Int. 24, 730–737 (2018). https://doi.org/10.1007/s12540-018-0097-4

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