Effect of Sb on the microstructure and mechanical properties of AZ91 magnesium alloy |
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Authors: | Qudong Wang Yanping Zhu Wenzhou Chen Wenjiang Ding M Mabuchi |
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Affiliation: | (1) the State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, 200030 Shanghai, People’s Republic of China;(2) National Industrial Research Institute of Nagoya, 1-1 Hirate-cho, Kita-ku, 462-8510 Nagoya, Japan |
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Abstract: | Effects of Sb addition on the microstructure, mechanical properties, and fracture behaviors of AZ91 magnesium alloy, as well
as the sensitivity to section thickness of the structure and mechanical properties, have been studied. The results show that
when Sb is added into the AZ91 alloy, the grain is refined, the Mg17Al12 phase is refined and granulated, and a new Mg3Sb2 phase is formed and becomes coarse needle-shaped as Sb content increases. The room-temperature tensile strength, elongation,
and impact toughness increase first, and then decrease with increasing Sb content. The study on sensitivity to section thickness
shows that, when composition is constant, the room-temperature tensile strength and elongation increase with the reduction
of section thickness; when section thickness is constant, the room-temperature tensile strength and elongation increase first,
and then decrease with increasing Sb content. Additionally, the Sb addition improves the tensile strength of the AZ91 alloy
at 100 °C and 150 °C. The room-temperature tensile and impact fractographs of the AZ91 alloy show intergranular fracture.
With increasing Sb content, the tearing deformation zones on the both fractographs enlarge at first, and then diminish, which
is consistent with the change of tensile strength, elongation, and impact toughness increasing first, and then reducing with
increasing Sb content. |
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