TY - JOUR
T1 - Influence of aluminium content on the microstructure and densification of spark plasma sintered nickel aluminium bronze
AU - Okoro, Avwerosuoghene Moses
AU - Lephuthing, Senzeni Sipho
AU - Oke, Samuel Ranti
AU - Olubambi, Peter Apata
N1 - Publisher Copyright:
© A.M. Okoro et al., Published by EDP Sciences 2021.
PY - 2021
Y1 - 2021
N2 - In this study, nickel aluminium bronze alloys (NAB) with appreciable densification and improved microhardness was consolidated via spark plasma sintering technique. The NAB alloy was synthesized from starting elemental powders comprised nickel (4 wt.%), aluminium (6, 8 & 10 wt.%) and copper using dry milling technique. Starting powders were homogeneously milled using gentle ball mill for 8 h at a speed of 150 rpm and a BPR of 10:1. Subsequently, the milled powders were consolidated using the spark plasma sintering technique at 750 °C under a compressive pressure of 50 MPa and rate of heating (100 °C/min). Furthermore, the powders and sintered alloys were characterized using SEM and XRD to ascertain the microstructural and phase evolutions during the synthesis of the NAB. The density and microhardness of the alloys were further investigated to ascertain the integrity of the sintered alloys. The results indicated that the increase in aluminium content resulted in the formation of intermetallic and beta phases on the alloy after sintering and the microhardness of the alloys improved with the increase in aluminium content.
AB - In this study, nickel aluminium bronze alloys (NAB) with appreciable densification and improved microhardness was consolidated via spark plasma sintering technique. The NAB alloy was synthesized from starting elemental powders comprised nickel (4 wt.%), aluminium (6, 8 & 10 wt.%) and copper using dry milling technique. Starting powders were homogeneously milled using gentle ball mill for 8 h at a speed of 150 rpm and a BPR of 10:1. Subsequently, the milled powders were consolidated using the spark plasma sintering technique at 750 °C under a compressive pressure of 50 MPa and rate of heating (100 °C/min). Furthermore, the powders and sintered alloys were characterized using SEM and XRD to ascertain the microstructural and phase evolutions during the synthesis of the NAB. The density and microhardness of the alloys were further investigated to ascertain the integrity of the sintered alloys. The results indicated that the increase in aluminium content resulted in the formation of intermetallic and beta phases on the alloy after sintering and the microhardness of the alloys improved with the increase in aluminium content.
KW - Densification
KW - Hardness
KW - Microstructure
KW - Nickel aluminium bronze
KW - Spark plasma sintering
UR - http://www.scopus.com/inward/record.url?scp=85103788610&partnerID=8YFLogxK
U2 - 10.1051/mfreview/2021006
DO - 10.1051/mfreview/2021006
M3 - Article
AN - SCOPUS:85103788610
SN - 2265-4224
VL - 8
JO - Manufacturing Review
JF - Manufacturing Review
M1 - 9
ER -