Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 732, Issue -, Pages 178-185Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.06.085
Keywords
Mg-RE alloy; Extrusion; Microstructure; Precipitation; High strength
Categories
Funding
- National Key Research and Development Program of China [2016YFB0301103]
- National Natural Science Foundation of China (NSFC) [51401010, 51671007, 51671012]
- Academic Excellence Foundation of BUAA
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A high-strength Mg-7Y-5Sm-0.5Zn-0.3Zr alloy was developed successfully by hot extrusion and subsequent aging treatment. The results showed that the as-solutionized alloy mainly contained alpha-Mg matrix and 14H LPSO phase distributed at grain boundaries. Lamellar LPSO and gamma' phases were dynamically precipitated during hot extrusion and retained after artificial aging treatment at 200 degrees C. After peak-aged treatment, the alloy exhibited excellent mechanical properties with ultimate tensile strength of 465 MPa, 0.2% proof stress of 413 MPa and elongation to failure of 6.5% at room temperature. The high yield strength was attributed to the combined action of 14H-LPSO phase, basal gamma' precipitates and dense distribution of beta' precipitates at prismatic plane.
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