Pulsed current activated synthesis and rapid consolidation of a nanostructured Mg2Al4Si5O18 and its mechanical properties

• Published in: Metals and materials international 2015, 21(2), , pp.345-349
• Main Authors: Shon, In-Jin, Kang, Hyun-Su, Doh, Jung-Mann, Yoon, Jin-Kook
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Engineering Thermodynamics; Heat and Mass Transfer; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metallic Materials; Processes; Solid Mechanics; 재료공학
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-015-4051-4

Nanocrystalline materials have received much attention as advanced engineering materials, with improved mechanical properties. Attention has been directed to the application of nanomaterials, as they possess excellent mechanical properties (high strength, high hardness, excellent ductility and toughness). A singlestep synthesis and consolidation of nanostructured Mg 2 Al 4 Si 5 O 18 was achieved by pulsed current heating, using the stoichiometric mixture of MgO, Al 2 O 3 and SiO 2 powders. Before sintering, the powder mixture was high-energy ball milled for 10 h. From the milled powder mixture, a highly dense nanostructured Mg 2 Al 4 Si 5 O 18 compound could be obtained within one minute, under the simultaneous application of 80 MPa pressure, and a pulsed current. The advantage of this process is that it allows an instant densification to the near theoretical density, while sustaining the nanosized microstructure of raw powders. The sintering behavior, microstructure and mechanical properties of Mg 2 Al 4 Si 5 O 18 were evaluated. The fracture toughness of a nanostructured Mg 2 Al 4 Si 5 O 18 compound was higher than that of sub-micron Mg 2 Al 4 Si 5 O 18 compound.