High-temperature mechanical properties of as-extruded AZ80 magnesium alloy at different strain rates

Wenjun Liu; Bin Jiang; Hongchen Xiang; Qing Ye; Shengqi Xia; Siqiang Chen; Jiangfeng Song; Yanlong Ma; Mingbo Yang

doi:10.1007/s12613-022-2456-x

Volume 29 Issue 7

Jul. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(7): 1373-1379

Wenjun Liu, Bin Jiang, Hongchen Xiang, Qing Ye, Shengqi Xia, Siqiang Chen, Jiangfeng Song, Yanlong Ma, and Mingbo Yang, High-temperature mechanical properties of as-extruded AZ80 magnesium alloy at different strain rates, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1373-1379. https://doi.org/10.1007/s12613-022-2456-x

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Wenjun Liu, Bin Jiang, Hongchen Xiang, Qing Ye, Shengqi Xia, Siqiang Chen, Jiangfeng Song, Yanlong Ma, and Mingbo Yang, High-temperature mechanical properties of as-extruded AZ80 magnesium alloy at different strain rates, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1373-1379. https://doi.org/10.1007/s12613-022-2456-x

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Research Article

High-temperature mechanical properties of as-extruded AZ80 magnesium alloy at different strain rates

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Corresponding authors:
Wenjun Liu E-mail: wjliu@cqut.edu.cn

Bin Jiang E-mail: jiangbinrong@cqu.edu.cn
Received: 25 October 2021; Revised: 5 February 2022; Accepted: 2 March 2022; Available online: 3 March 2022

Abstract

Abstract

The mechanical properties of as-extruded AZ80 magnesium alloy at temperatures of 450–525°C and strain rates of 3.0 s⁻¹ and 0.15 s⁻¹ were investigated by tensile tests. Zero ductility of alloy appeared at 500°C with a strain rate of 0.15 s⁻¹, while the zero strength and zero ductility of the alloy were obtained nearly simultaneously at 525°C with a strain rate of 3.0 s⁻¹. The results indicated that the lower strain rate accelerated the arrival of zero ductility. As the temperature increased, the failure mode of the alloy developed from trans-granular fracture to cleavage fracture and then to inter-granular fracture with the feature of sugar-like grains and fusion traces. The existence of the low-melting composite of β-Mg₁₇Al₁₂ and Al₈Mn₅ particles segregated near the Mg₁₇Al₁₂ phase along grain boundaries were demonstrated to be the reason for the brittle fracturing of the AZ80 alloy at high temperatures. Furthermore, microstructural evolution at temperatures approaching the solidus temperature was discussed to clarify magnesium alloy’s high temperature deformation mechanism.
- AZ80 magnesium alloy;
- strain rate;
- microstructural evolution;
- Al₈Mn₅ phase;
- fracture morphology

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