Effect of TiO₂ in aluminum matrix on workability behavior of powder metallurgy composites during cold upsetting

Abstract

Effect of TiO 2 in aluminum matrix on workability behavior of powder metallurgy composites during cold upsetting Aluminum-based metal matrix composites withv arious weight percentages (0, 2.5, 5, 7.5, and 10) of TiO 2 reinforcementw eres ynthesized by means of powder metallurgy and theirw orkability behavior under triaxial stress-state conditions was completely studied during cold upsetting. Green cylindrical compactswere made using a400 kN hydraulic press with suitable punch and die, sintered at (590 ±10) 8 Cf or ap eriod of 3h,f urnace cooled and machinedtoobtain samples with 0.5 aspect ratio. The cold upset tests were carriedo ut in steps of 10 kN and the results were studied for the workability behavior of the composites. The formability stress index ( b )a nd stress ratio parameters ( r z / r eff ), ( r m / r eff ), and ( r h / r eff )w ere calculated for all composites and correlated with true axial strain(e z ). It was observed that the addition of TiO 2 to the Al matrix material increases the stress ratio parameters and formability stress index ( b ).

Investigations on microstructure and mechanical properties of Mg-5wt.% Cu-TiB2 composites produced via powder metallurgy route

“…All the primary and secondary materials were 60µm in size. The composites were fabricated by powder metallurgy route [30]. A constant weight fraction of 5% copper was used in all the compositions.…”

Investigations on Properties of Al-B₄C Composites Synthesized through Powder Metallurgy Route

“…1(a). The required pressure was applied using hydraulic press of 400 kN capacities [11]. Graphite was used as lubricant to avoid sticking of powder to these surfaces.…”

Studies on mechanical properties of the sintered bronze-graphite composites

“…It was reported that the addition of graphite serves to reduce hardness in copper-tin alloys and the low amount of graphite content was justified by the necessity to preserve mechanical properties. Ravichandran et al (2014) have revealed that uniform distribution of TiO 2 reinforcement was observed in Al matrix prepared by P/M method and found that there is decrease in porosity for Al-TiO 2 composites when compared with pure Al. Nickchi and Ghorbani (2009) have reported that at low duty cycles, the graphite content of the coating increases which tends to decrease the hardness as a soft phase and simultaneously the hardness of the bronze matrix increases and hence the overall hardness of the composite does not change considerably.…”