Journal
JOURNAL OF MAGNESIUM AND ALLOYS
Volume 10, Issue 2, Pages 501-512Publisher
KEAI PUBLISHING LTD
DOI: 10.1016/j.jma.2020.09.023
Keywords
Magnesium alloys; Heat treatment; Hall-Petch; Mechanical properties; Strengthening mechanism
Categories
Funding
- National Natural Science Foundation of China [51904036, 51874049]
- Hu-nan Provincial Natural Science Foundation of China [2020JJ5600, 2018JJ2365]
- Hunan Education Depart-ment Outstanding Youth Project of China [17B069]
- Scientific Research Project of Hunan Education Depart-ment [20C0088]
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The effects of different treatments on the microstructure and mechanical properties of an extruded Mg-4.3Gd-3.2Y-1.2Zn-0.5Zr alloy were investigated. The study found that grain growth, texture changes, and stability of LPSO phases have an impact on the alloy's properties.
The effects of T4, T5, and T6 treatment on the microstructure and mechanical properties of the extruded Mg-4.3Gd-3.2Y-1.2Zn-0.5Zr (wt.%) alloy with a relatively low RE content (7.5 wt.%) were investigated. T4 treatment at 450-500 degrees C induces a gradual grain growth of alpha-Mg but an obvious transition of texture component from < 0001 >perpendicular to ED to < 0001 >parallel to ED. Interdendritic LPSO phases are highly stable against annealing while intragranular ones experience dissolution and re-precipitation. After peak-ageing at 200 degrees C, the elongation of as-extruded and T4 samples is just slightly reduced or even increased due to the weak ageing hardening response. T5 sample exhibits an attractive combination of strength and ductility, with a tensile yield strength (TYS) of 303 MPa and elongation of 20.0%. The Hall-Petch relation for the alloys with or without ageing treatment has been estimated. Grain boundary strengthening rather than precipitation strengthening has the dominant contribution to TYS, and a modified equation is developed to predict grain boundary strengthening values for Mg-Gd-Y-Zn-Zr alloys which contain different Schmid factors for basal slip. (c) 2020 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.
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