Microstructural evolution and creep properties of Mg-4Sn alloys by addition of calcium up to 4 wt.% |
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| Affiliation: | 1. Department of Mechanical Engineering, University of Iowa, Iowa City, IA, USA;2. Department of Mining, Metallurgical and Materials Engineering, Laval University, Québec, Canada;3. Faculty of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran;1. MagIC – Magnesium Innovation Centre, Helmholtz-Zentrum Geesthacht, Max-Planck-Straße 1, 21502, Geesthacht, Germany;2. Faculty of Materials and Energy, Southwest University, Chongqing, 400715, China;1. Department of Metallurgical and Materials Engineering, Karabuk University, Turkey;2. Department of Metallurgical and Materials Engineering, Bartın University, Turkey;1. ARC-Centre of Excellence for Design in Light Metals, Materials Engineering, School of Engineering, The University of Queensland, Brisbane QLD 4072, Australia;2. Queensland Centre for Advanced Materials Processing and Manufacturing (AMPAM), The University of Queensland, Australia;1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China;2. Yangzhou hongfu Aluminium Co. Ltd, Yangzhou 100049, PR China;3. University of Chinese Academy of Sciences, Beijing 100049, PR China |
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| Abstract: | The effects of addition of calcium up to 4 wt.% on the microstructure and creep properties of Mg-4Sn alloys were investigated by the impression creep test. Impression creep tests were performed in temperature range between 445 and 475 K under normalized stresses σ/G (where σ is the stress; G is the shear modulus) between 0.0225 and 0.035. Optical microscopy and scanning electron microscopy were used to study the microstructure of samples. It is observed that the addition of Ca more than 2 wt.% suppresses less stable MgSn2 phase, and instead forms more thermally stable phases of Ca-Mg-Sn and Mg2Ca at the grain boundaries which improve the creep resistance of Mg-4Sn alloys. According to the stress exponents (6.04<n<6.89) and activation energies (101.37 kJ/mol<Q<113.8 kJ/mol) which were obtained from the impression creep tests, it is concluded that the pipe diffusion climb controlled dislocation creep is the dominant creep mechanism. |
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| Keywords: | impression creep test Mg-Sn-Ca alloy creep mechanism microstructure |
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