Abstract
This work investigated the effect of carbon nanotubes (CNTs) incorporation into the B2 ordered NiAl lattice structure in varying contents, via a unique two stage milling process. The milled powders were consolidated by spark plasma sintering and the sintered composites were extensively characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy (RS) and nanoindentation techniques. Results show that the NiAl-1.0 wt% CNTs exhibited the best combination of properties with an improved fracture toughness value of 11.25 MPa√m and 306.37 HV for microhardness, while the unreinforced sample showed fracture toughness and microhardness values of 6.93 MPa√m and 349.49 HV respectively. The enhanced fracture toughness was attributed to the retained lengths of the CNTs in addition to the disordering of the ordered lattice structure of NiAl owing to the introduction of the nanotubes.
| Original language | English |
|---|---|
| Article number | 140070 |
| Journal | Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing |
| Volume | 796 |
| DOIs | |
| Publication status | Published - 7 Oct 2020 |
Keywords
- Carbon nanotubes
- Fracture toughness
- Nanoindentation
- Nickel aluminide
- Spark plasma sintering
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering