Grain-Refined AZ92 Alloy with Superior Strength and Ductility |
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Authors: | Jong Un Lee Sang-Hoon Kim Wan-Kuen Jo Won-Hwa Hong Woong Kim Jun Ho Bae Sung Hyuk Park |
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Affiliation: | 1.School of Materials Science and Engineering,Kyungpook National University,Daegu,Republic of Korea;2.Department of Environmental Engineering,Kyungpook National University,Daegu,Republic of Korea;3.School of Architecture,Kyungpook National University,Daegu,Republic of Korea;4.Implementation Research Division,Korea Institute of Materials Science,Changwon,Republic of Korea |
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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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