Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 35, Issue 10, Pages 2365-2374Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2019.05.053
Keywords
Mg alloys; Stacking faults; Mechanical properties; Thermal conductivity
Funding
- National Natural Science Foundation of China [51871069]
- Natural Science Foundation of Heilongjiang Province of China [E2017030]
- Fundamental Research Funds for the Central Universities [3072019CF1004]
- Foundation of State Key Laboratory of Rare Earth Resources Utilization [RERU2018017]
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A new Mg-6Er-3Y-1.5Zn-0.4 Mn (wt.%) alloy with high strength at high temperature was designed and extruded at 350 degrees C. The as-extruded alloy exhibits ultimate tensile strength of 301 MPa, yield strength (along ED) of 274 MPa and thermal conductivity of 73 W/m.K at 300 degrees C. Such outstanding high-temperature strength is mainly attributed to the formation of nano-spaced solute-segregated basal plane stacking faults (SFs) with a large aspect ratio throughout the entire Mg matrix, fine dynamically recrystallized (DRXed) grains of 1-2 mu m and strongly textured un-DRXed grains with numerous sub-structures. Microstructural examination unveils that long period stacking ordered (LPSO) phases are formed in Mg matrix of the as-cast alloy when rational design of alloy composition was employed, i.e. (Er +Y): Zn =3: 1 and Er: Y=1: 1 (at.%). It is worth mentioning that it is the first report regarding the formation of nano-spaced basal plane SFs throughout both DRXed and un-DRXed grains in as-extruded alloy with well-designed compositions and processing parameters. The results provide new opportunities to the development of deformed Mg alloys with satisfactory mechanical performance for high-temperature services. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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