Abstract
The Mg MB26/Al 7075 composite rod, in which Mg MB26 serves as the sleeve and Al 7075 serves as the core, is fabricated via the process of co-extrusion. The influence of extrusion speed on the microstructure evolution, interface bonding and mechanical response of the Mg MB26/Al 7075 composite rod is investigated. The results show that the typical extrusion texture of Mg sleeve does not change during co-extrusion; however, the average grain size in the Mg sleeve slightly changes from 1.57 μm in the case of extrusion speed of 0.3 mm/s to 2.78 μm in the case of extrusion speed of 2.1 mm/s. The thickness of interface transition layer increases significantly from 5.5 to 50 μm, and therefore, the interface bonding becomes deteriorative with increasing extrusion speed; in particular, many cavities emerge in the case of 1.2 and 2.1 mm/s.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51301213, 51501026 and 51701034), the Basic and Advanced Research Project of CQ CSTC (Grant Nos. cstc2016jcyjA0452, cstc2017jcyjAX0775 and cstc2017jcyjAX0062), and Scientific and Technological Research Program of Chongqing Municipal Education Commission (Grant Nos. KJ1600922, KJ1600924).
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Chen, Y., Zhang, R., Zhou, T. et al. Influence of Extrusion Speed on the Microstructure Evolution, Interface Bonding and Mechanical Response of Mg MB26/Al 7075 Composite Rod. Acta Metall. Sin. (Engl. Lett.) 32, 253–262 (2019). https://doi.org/10.1007/s40195-018-0838-x
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DOI: https://doi.org/10.1007/s40195-018-0838-x