TY - JOUR
T1 - Nanoindentation studies of the mechanical behaviours of spark plasma sintered multiwall carbon nanotubes reinforced Ti6Al4V nanocomposites
AU - Okoro, Avwerosuoghene Moses
AU - Machaka, Ronald
AU - Lephuthing, Senzeni Sipho
AU - Oke, Samuel Ranti
AU - Awotunde, Mary Ajimegoh
AU - Olubambi, Peter Apata
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/9/23
Y1 - 2019/9/23
N2 - In this study, the influence of multiwall carbon nanotubes (MWCNT) additions on the mechanical properties of sintered Ti6Al4V-based nanocomposites was investigated. The nanocomposites were fabricated with varying weight fractions of MWCNT (0.5, 1.0 & 1.5 wt%) using the spark plasma sintering (SPS) technique. Investigations were carried out using nanoindentation of varying indentation loads (50 mN, 75 mN and 100 mN) to assess the nanohardness (H) and reduced elastic modulus (Er) of the alloy and nanocomposites. Further analysis was done to evaluate the elastic recovery index ( [Formula presented] ), plasticity index ( [Formula presented] ), elastic strain resistance ( [Formula presented] ) and yield pressure ( [Formula presented] ) at the maximum load. Microstructural analysis revealed the presence of the MWCNT dispersed across the alpha and beta phases of the Ti6Al4V matrix. The nanoindentation studies showed that the nanohardness, elastic modulus, elastic recovery index, elastic strain resistance and anti-wear properties improved with the MWCNT addition and continually increased with increase in nanotubes content. Also, it was observed that the nanohardness and reduced elastic modulus of the fabricated nanocomposites are in the range of 4677–9276 MPa and 29.3–60.9 GPa respectively which declined with increase in indentation load. The sintered Ti6Al4V displayed the least resistance to plastic deformation.
AB - In this study, the influence of multiwall carbon nanotubes (MWCNT) additions on the mechanical properties of sintered Ti6Al4V-based nanocomposites was investigated. The nanocomposites were fabricated with varying weight fractions of MWCNT (0.5, 1.0 & 1.5 wt%) using the spark plasma sintering (SPS) technique. Investigations were carried out using nanoindentation of varying indentation loads (50 mN, 75 mN and 100 mN) to assess the nanohardness (H) and reduced elastic modulus (Er) of the alloy and nanocomposites. Further analysis was done to evaluate the elastic recovery index ( [Formula presented] ), plasticity index ( [Formula presented] ), elastic strain resistance ( [Formula presented] ) and yield pressure ( [Formula presented] ) at the maximum load. Microstructural analysis revealed the presence of the MWCNT dispersed across the alpha and beta phases of the Ti6Al4V matrix. The nanoindentation studies showed that the nanohardness, elastic modulus, elastic recovery index, elastic strain resistance and anti-wear properties improved with the MWCNT addition and continually increased with increase in nanotubes content. Also, it was observed that the nanohardness and reduced elastic modulus of the fabricated nanocomposites are in the range of 4677–9276 MPa and 29.3–60.9 GPa respectively which declined with increase in indentation load. The sintered Ti6Al4V displayed the least resistance to plastic deformation.
KW - Mechanical properties
KW - Multiwall carbon nanotubes
KW - Nanocomposites
KW - Nanoindentation studies
KW - Titanium alloys
UR - http://www.scopus.com/inward/record.url?scp=85071090540&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2019.138320
DO - 10.1016/j.msea.2019.138320
M3 - Article
AN - SCOPUS:85071090540
SN - 0921-5093
VL - 765
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
M1 - 138320
ER -