4.7 Article

Friction stir welding of multi-walled carbon nanotubes reinforced Al matrix composites

Journal

MATERIALS CHARACTERIZATION
Volume 145, Issue -, Pages 653-663

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2018.09.033

Keywords

Metal-matrix composites; Powder metallurgy; Friction stir welding; Mechanical properties; Microstructures

Funding

  1. New Energy and Industrial Technology Development Organization (NEDO) under the Innovation Structural Materials Project [46]
  2. Japan Society for the Promotion of Science [15H04133]
  3. Sunchon National University Research Fund [2018-0178]
  4. Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2017R1A6A3A03002080]

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In this study, we prepared composites between Al and multi-walled carbon nanotubes (MWCNTs) using the friction stir welding (FSW) method and investigated their microstructural evolution and mechanical properties by controlling the amount of MWCNT (1 and 3 vol%) and the plunging load (400 and 600 kg) used. After the FSW process, MWCNT showed slight coarsening of grain with random shear textures and accumulated dislocations; the differences obtained by varying the plunging load and MWCNT amount were insignificant. The friction-stir welded composite obtained using 3 vol% MWCNT and a plunging load of 600 kg possessed two-times better balance between strength and ductility than the base metal, due to the presence of both MWCNTs and the partially decomposed Al4C3 in the composite.

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