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Materials 2018, 11(1), 102;

Achieving High Strength and Good Ductility in As-Extruded Mg–Gd–Y–Zn Alloys by Ce Micro-Alloying

School of Mechatronics and Automotive Engineering, Chongqing Jiaotong University, Chongqing 400074, China
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Authors to whom correspondence should be addressed.
Received: 10 December 2017 / Revised: 1 January 2018 / Accepted: 3 January 2018 / Published: 10 January 2018
(This article belongs to the Special Issue Thermo-Mechanical Behaviour of Structural Lightweight Alloys)
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In this study, the effect of Ce additions on microstructure evolution of Mg–7Gd–3.5Y–0.3Zn (wt %) alloys during the casting, homogenization, aging and extrusion processing are investigated, and novel mechanical properties are also obtained. The results show that Ce addition promotes the formation of long period stacking ordered (LPSO) phases in the as-cast Mg–Gd–Y–Zn–Ce alloys. A high content of Ce addition would reduce the maximum solubility of Gd and Y in the Mg matrix, which leads to the higher density of Mg12Ce phases in the as-homogenized alloys. The major second phases observed in the as-extruded alloys are micron-sized bulk LPSO phases, nano-sized stripe LPSO phases, and broken Mg12Ce and Mg5RE phases. Recrystallized grain size of the as-extruded 0.2Ce, 0.5Ce and 1.0Ce alloys can be refined to ~4.3 μm, ~1.0 μm and ~8.4 μm, respectively, which is caused by the synthesized effect of both micron phases and nano phases. The strength and ductility of as-extruded samples firstly increase and then decrease with increasing Ce content. As-extruded 0.5Ce alloy exhibits optimal mechanical properties, with ultimate strength of 365 MPa and ductility of ~15% simultaneously. View Full-Text
Keywords: magnesium alloys; alloying; second phases; dynamic recrystallization; mechanical properties magnesium alloys; alloying; second phases; dynamic recrystallization; mechanical properties

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Gao, Z.; Hu, L.; Li, J.; An, Z.; Li, J.; Huang, Q. Achieving High Strength and Good Ductility in As-Extruded Mg–Gd–Y–Zn Alloys by Ce Micro-Alloying. Materials 2018, 11, 102.

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