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Open Access Effect of heat treatment on microstructures and mechanical properties of Mg–Zn–Gd–Zr alloys with different compositions

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Effects of heat treatments on the microstructures and mechanical properties of three as-extruded Mg–Zn–Gd–Zr alloys with specific Zn/Gd mass ratios with three different ternary phases are systematically investigated. With the Zn/Gd ratio increases from 0.27 to 1.4, lamellar-like X-phase, block-like W-phase and needle-like I-phase appear in experimental alloys in succession. Large amounts of fine β' phases precipitate in -Mg matrix of T5 treated Mg–3Zn–11Gd–0.6Zr alloy, and its superior ultimate tensile strength, tensile yield strength and elongation are 390 MPa, 295 MPa and 11.9%, owing to the β' precipitation strengthening and LPSO X-phase strengthening. A great number of ellipsoidal-shaped nanoscale I-phase generates in T6 state Mg–7Zn–5Gd–0.6Zr alloy. Mg–7Zn–5Gd–0.6Zr alloy owns an ultimate and yield strength of 365 MPa and 305 MPa, respectively, as well as the elongation of 14.3%. X-phase strengthening effect is superior to I-phase on the Mg–Zn–Gd–Zr alloys during heat treatment.
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Keywords: HEAT TREATMENT; MECHANICAL PROPERTIES; MG–ZN–GD–ZR ALLOYS; PRECIPITATION; TERNARY PHASES

Document Type: Research Article

Publication date: June 1, 2018

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