The evolution of microstructure and mechanical properties during high-speed direct-chill casting in different Al-Mg2Si in situ composites |
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作者姓名: | Dong-tao Wang Hai-tao Zhang Lei Li Hai-lin Wu Ke Qin Jian-zhong Cui |
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作者单位: | Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China |
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基金项目: | This work was financially supported by the Science and Technology Program of Guangzhou, China;Postdoctoral Science Foundation of China;Postdoctoral Science Founda-tion of Northeastern University;the Doctoral Foundation of Chinese Ministry of Education |
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摘 要: | The effect of high-speed direct-chill (DC) casting on the microstructure and mechanical properties of Al-Mg2Si in situ composites and AA6061 alloy was investigated. The microstructural evolution of the Al-Mg2Si composites and AA6061 alloy was examined by optical microscopy, field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The results revealed that an increase of the casting speed substantially refined the primary Mg2Si particles (from 28 to 12 μm), the spacing of eutectic Mg2Si (from 3 to 0.5 μm), and the grains of AA6061 alloy (from 102 to 22 μm). The morphology of the eutectic Mg2Si transformed from lamellar to rod-like and fibrous with increasing casting speed. The tensile tests showed that the yield strength, tensile strength, and elongation improved at higher casting speeds because of refinement of the Mg2Si phase and the grains in the Al-Mg2Si composites and the AA6061 alloy. High-speed DC casting is demonstrated to be an effective method to improve the mechanical properties of Al-Mg2Si composites and AA6061 alloy billets.
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关 键 词: | Al-Mg2Si in situ composite casting speed grain size primary Mg2Si mechanical property |
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