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Open AccessArticle

Development of Hot-Extruded Mg–RE–Zn Alloy Bar with High Mechanical Properties

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Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
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Department of Materials Physics and Chemistry, Harbin Institute of Technology, Harbin 150001, China
3
State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
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Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(10), 1722; https://doi.org/10.3390/ma12101722
Received: 3 May 2019 / Revised: 22 May 2019 / Accepted: 22 May 2019 / Published: 27 May 2019
A new elevated-temperature high-strength Mg–4Er–2Y–3Zn–0.4Mn (wt %) alloy was developed by semi-continuous casting, solid solution treatment, and hot extrusion. W phase (Mg3(Er,Y)2Zn3) with fcc structure, long period stacking ordered phases with 18R (Mg10(Er,Y)1Zn1) and 14H (Mg12(Er,Y)1Zn1) structures, and basal plane stacking faults (SFs) was formed in the as-cast alloy, mainly due to the alloy component of (Er + Y)/Zn = 1:1 and Er/Y = 1:1 (at %). After solid solution treatment and hot extrusion, the novel microstructure feature formed in as-extruded alloy is the high number-density nanospaced basal plane SFs throughout all the dynamically recrystallized (DRXed) and un-DRXed grains, which has not been previously reported. The as-extruded alloy exhibits superior tensile properties from room temperature to 300 °C. The tensile yield strength can be maintained above 250 MPa at 300 °C. The excellent elevated-temperature strength is mainly ascribed to the formation of nanospaced basal plane SFs throughout the whole Mg matrix, fine DRXed grains ~2 μm in size, and strongly basal-textured un-DRXed grains with profuse substructures. The results provide new opportunities for the development of deformed Mg alloys with satisfactory mechanical properties for high-temperature services. View Full-Text
Keywords: Mg alloys; hot extrusion; microstructure; mechanical properties; stacking faults Mg alloys; hot extrusion; microstructure; mechanical properties; stacking faults
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Li, Z.; Zhang, J.; Feng, Y.; Xie, J.; Liu, Y.; Liu, S.; Meng, J.; Yang, Q.; Liu, Z.; Wu, R. Development of Hot-Extruded Mg–RE–Zn Alloy Bar with High Mechanical Properties. Materials 2019, 12, 1722.

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