TY - JOUR
T1 - Effect of nickel addition on densification, microstructure and wear behaviour of spark plasma sintered CP-titanium
AU - Rominiyi, Azeez Lawan
AU - Shongwe, Mxolisi Brendon
AU - Ogunmuyiwa, Enoch Nifise
AU - Babalola, Bukola Joseph
AU - Lepele, Paballo Fortinate
AU - Olubambi, Peter Apata
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/1/15
Y1 - 2020/1/15
N2 - Titanium alloys with varying amounts of nickel additions (2, 6 and 10 wt%) were prepared through the spark plasma sintering technique. The influence of nickel additions on densification, microstructure and wear behaviour of the sintered alloys was investigated, against commercially-pure titanium (CP–Ti). SEM analysis results showed a mixed portion of dark background (α-Ti), white patches and bright spots within the matrix of the sintered binary alloys compared to sintered CP-Ti matrix. These white patches and bright spots were confirmed by the X-ray diffraction (XRD) results to be a mixture of intermetallic phases of Ti2Ni (FCC) and TiNi2 (HCP). The relative density and the microhardness value were found to increase from 91.42% to 99.6% and 212 HV0.1 to 343 HV0.1 respectively. Estimated yield and tensile strength values were observed to vary linearly with increasing concentration of Ni in the sintered alloys. Analysis of the worn surfaces indicated improved resistance to adhesive and abrasive wear with increasing nickel content in the sintered alloys.
AB - Titanium alloys with varying amounts of nickel additions (2, 6 and 10 wt%) were prepared through the spark plasma sintering technique. The influence of nickel additions on densification, microstructure and wear behaviour of the sintered alloys was investigated, against commercially-pure titanium (CP–Ti). SEM analysis results showed a mixed portion of dark background (α-Ti), white patches and bright spots within the matrix of the sintered binary alloys compared to sintered CP-Ti matrix. These white patches and bright spots were confirmed by the X-ray diffraction (XRD) results to be a mixture of intermetallic phases of Ti2Ni (FCC) and TiNi2 (HCP). The relative density and the microhardness value were found to increase from 91.42% to 99.6% and 212 HV0.1 to 343 HV0.1 respectively. Estimated yield and tensile strength values were observed to vary linearly with increasing concentration of Ni in the sintered alloys. Analysis of the worn surfaces indicated improved resistance to adhesive and abrasive wear with increasing nickel content in the sintered alloys.
KW - CP-Titanium
KW - Microstructural evolution
KW - Nickel addition
KW - Spark plasma sintering
KW - Wear behaviour
UR - http://www.scopus.com/inward/record.url?scp=85072156176&partnerID=8YFLogxK
U2 - 10.1016/j.matchemphys.2019.122130
DO - 10.1016/j.matchemphys.2019.122130
M3 - Article
AN - SCOPUS:85072156176
SN - 0254-0584
VL - 240
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
M1 - 122130
ER -