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Metallic Materials Vol. 55 (2017), no. 1, pp.13-20

Title: Microstructure evolution and mechanical properties of the Mg-7Zn-(xY-0.6Zr (x = 6, 9, 12 wt.%) alloys
Author: Z. Q. ZHANG, S. Q. YIN, X. LIU, L. BAO, W. Y. HU, Q. C. LE, J. Z. CUI
Abstract: Mg-7Zn-(xY-0.6Zr (x = 6, 9, 12 wt.%) alloys have been designed to investigate the effects of Y content on the microstructure and mechanical properties. The results show that Y content plays a key role in the phase composition and mechanical properties of the investigated Mg-7Zn-(xY-0.6Zr alloys. With the Y content increasing from 6 to 12 %, the phase composition transformed from (α-Mg + W-phase (Mg3Y2Zn3) to α-Mg + X-phase (Mg12YZn). The amount of X-phase increases rapidly, and W-phase decreases accordingly. Furthermore, the W-phase distributes alternatively with the X-phase, due to the specific local Y/Zn mole ratio at the final solidifying stage. After extrusion, the phase composition and corresponding volume fraction have great influence on mechanical properties. The X-phase is in favour of high strength and the W-phase makes for good plasticity. The as-extruded Mg-7Zn-12Y-0.6Zr alloy establishes the highest strength with an ultimate tensile and yield tensile strength of 416 MPa and 302 MPa, respectively.
Keywords: Mg-Zn-Y-Zr, extrusion, casting and solidification, microstructures, mechanical properties
Published online: 14-Mar-2017
Year: 2017, Volume: 55, Issue: 1 Page From: 13, Page To: 20
doi:10.4149/km_2017_1_13


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