Microstructure and tensile properties of rapid-cooling friction-stir-welded AZ31B Mg alloy along thickness direction |
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| Affiliation: | 1. School of Mechanical Engineering, Anyang Institute of Technology, Anyang 455000, China;2. School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;3. Anyang Key Laboratory of Advanced Aeronautical Materials and Processing Technology, Anyang Institute of Technology, Anyang 455000, China |
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| Abstract: | Rapid-cooling friction-stir-welding (FSW) was used to join AZ31B magnesium alloy plates of 6 mm in thickness. The microstructure and mechanical properties in thickness direction were carefully investigated with electron backscattered diffractometer, and transmission electron microscope. The obtained results showed that ultrafine grains with high dislocation density were obtained in the top region of the weld due to liquid CO2 cooling. A large number of twins and second-phase particles were also induced in these refined grains. The basal texture intensity was significantly reduced due to the appearance of twins. The top region showed the higher strength and elongation compared with the bottom region, and the welding efficiency reached 93%. This work provided a simple and efficient strategy for manufacturing a gradient structure in the FSW Mg alloy joint. |
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| Keywords: | friction stir welding magnesium alloy recrystallization texture microstructure mechanical properties |
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