Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 687, Issue -, Pages 155-163Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.01.060
Keywords
Mechanical properties; Lamellar structure.; A12024 alloy; Mechanical milling; Spark plasma sintering
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Funding
- National Natural Science Foundation of China (NSFC) [51671007, 51671012, 51401010]
- National 863 Project [2013AA031001]
- National 973 Project [2012CB619503]
- International Science and Technology Cooperation Program of China [2015DFA51430, 2013DFB70200]
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Recently, mechanical properties improvement through microstructure design has attracted worldwide attention. In the present study, a bottom to up route including mechanical milling and spark plasma sintering was employed for fabricating ultrafine lamellar structured A12024 alloy. Microstructure observation revealed that flake shaped powder with a mean grain size of about 60 nm was obtained by mechanical milling for 20 h. The flake shaped powder self-assembled during sintering, forming a bulk sample with periodic lamellar structure and ultrafine grain size (1.14 pm). Tensile test revealed that the ultrafine lamellar structured alloy exhibited significantly enhanced strength (yield strength 375 MPa, tensile strength 456 MPa) compared to the conventional 0-state counterpart, but the tensile ductility was reduced (tensile elongation 5%). Strategies for further optimizing the mechanical properties of the bulk samples were discussed.
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