Densification, hardness and tribological characteristics of MWCNTs reinforced Ti6Al4V compacts consolidated by spark plasma sintering

Adegbenjo, Adewale O.; Obadele, Babatunde Abiodun; Olubambi, Peter Apata

doi:10.1016/j.jallcom.2018.03.373

Cited by 47 publications

(16 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The hardness values of composite materials increased due to the AlB 2 and AL 3 BC phases formed by B 4 C and aluminum. As opposed to this, low hardness values were occasionally also observed, which may be explained by encountering the pure Al matrix in addition to increased B 4 C amounts [25].…”

Section: Figure 10mentioning

confidence: 88%

Investigation of Wear Behavior of Particle Reinforced AL/B4C Composites under Different Sintering Conditions

Topçu

2020

Teh. glas. (Online)

View full text Add to dashboard Cite

In this study, the effects of different sintering conditions of boron carbide reinforced to aluminum matrix powder on microstructure, density and wear resistance by a mechanical alloying method were researched. Powders produced by mechanical alloying for eight hours at the atrial shaft were compressed with a cold isostatic press die under 350 MPa to obtain cylindrical composite specimens. The raw samples were sintered in high purity argon at 600, 625, 650 °C for 90 minutes. The wear behavior of the Al/B4C metal matrix composite was studied using a pin-on-disk wear tester. Under favorable conditions, it has been observed that reinforced boron carbide wear can be reduced by more than two decades. Various investigations have been made to relate this improved wear performance to reinforcement ratios. Aluminum abrasion test results showed that different types of abrasion occurred and that the abrasion resistance was increased by the change of the bubble rate. In the experimental studies that were carried out, it was observed that wear resistance increased with the proportion of boron carbide reinforced directly by the weight, and especially with a 15% B4C ratio depending on the increased reinforcement ratio.

show abstract

Section: Figure 10mentioning

confidence: 88%

Investigation of Wear Behavior of Particle Reinforced AL/B4C Composites under Different Sintering Conditions

Topçu

2020

Teh. glas. (Online)

View full text Add to dashboard Cite

show abstract

“…Sintering of Ti6Al4V has been widely investigated in pressureless and pressure-assisted powder metallurgy routes. [8][9][10]15,[29][30][31][32][33][34][35][36][37][38][39][40][41] Figure 5 shows a visual summary of the commonly used sintering techniques in the processing of Ti6Al4V prealloyed powders. Among two common sintering regimes for the densification of the alloy (1) and (2), this work outlines the emergence of a third regime (3) denominated as a "processing gap" (<800 C).…”

Section: Significance Of Low-temperature Sintering Of Ti6al4vmentioning

confidence: 99%

“…[1][2][3][4] Earlier studies have shown the advantage of simultaneous pressure and heating used in spark plasma sintering (SPS) to manufacture high-performance Ti structures at sintering temperatures of 850-1200 C and short processing time of 10-30 min. [5][6][7][8][9][10] The significant reduction in sintering time by up to 4Â required in other powder metallurgy routes (i.e., pressureless sintering, hot pressing, and hot isostatic pressing) has been beneficial in restricting grain growth and imparting rapid densification rates. [11] Yet, their mechanical performance is still below that of competing structural metals like steels and some Al alloys, [12] prompting the addition of reinforcing nanoparticles into the Ti matrix.…”

Section: Introductionmentioning

confidence: 99%

Ultralow Temperature Densification of a Titanium Alloy by Spark Plasma Sintering

et al. 2020

View full text Add to dashboard Cite

Full densification of a Ti alloy (Ti6Al4V) is achieved at unprecedented low temperatures of 650 °C and 555 MPa by spark plasma sintering (SPS) without any sintering aid. The alloy demonstrates a globular equiaxed microstructure with comparable mechanical properties as that sintered at conventional high temperatures (950 °C, 60 MPa). In contrast with the diffusion‐driven sintering of the Ti alloy at conventional SPS conditions, the near‐full densification (99%) attained at low‐temperature/high‐pressure regimes is attributed to plastic deformation‐driven mass transport processes. Sintering pressures of 555 MPa result in a dislocation dense microstructure and the activation of compressive twins imparting lattice strains of up to 2.86 × 10−3, suggesting a 25% increase in lattice distortions as compared with those sintered at moderate pressures of 60 MPa. Depth‐sensing nanoscale indentation reveals the globular microstructure of the high‐pressure‐sintered alloy to retain its elastic modulus and hardness of 138 and 4.8 GPa, respectively, with <2% deviation from those sintered at conventional SPS temperatures. This energy‐efficient technique proposes an alternative to thermally exhaustive routines and presents an advantage for engineering titanium‐matrix composites with nanofillers and controlled reaction products by reducing processing temperatures by up to 300 °C.

show abstract

“…Moreover, the simultaneous pressure and heating during the sintering of metallic powders have been investigated via Spark Plasma Sintering routes. In which, near net shape structures are manufactured in periods between 10 -30 min 44,52,53,94,96,98 .…”

Section: Low-temperature Sintering Of Ti64al4vmentioning

confidence: 99%

“…presents a visual summary of the sintering techniques currently used for the sintering of Ti6Al4V prealloyed powders[94][95][96][97][98][99] . The graph differentiates and clearly states the high temperatures required in pressureless sintering processes to achieve scattered degrees of densification (62 -99%).…”

mentioning

confidence: 99%

Boron Nitride Nanotube–Reinforced Titanium Composite with Controlled Interfacial Reactions by Spark Plasma Sintering

Bustillos

Nautiyal

et al. 2020

Adv Eng Mater

View full text Add to dashboard Cite

In this study, Boron Nitride Nanotube (BNNT) reinforced Titanium matrix composites are synthesized by Spark Plasma Sintering. Two main challenges directly affecting the mechanical performance of BNNT-metal matrix composites are addressed:(i) Homogenous dispersion of high surface energy BNNTs, and (ii) Controlling interfacial reactions at the metal/nanotube interface. High affinity of acetone with BNNTs and high energy ultrasonication induced the mechanical dispersion and stability of BNNTs in their dispersion. The sintering of Ti (99% relative density) was achieved at 50% less processing temperature than those used in conventional sintering to minimize interfacial reactions when reinforced with BNNTs. The reduction of temperatures in addition to the reduction (by 91%) in processing times was shown to control reaction phases. Bulk compressive yield strengths of Ti-BNNT sintered at low (750 o C) and high (950 o C) temperatures were improved by 21% and 50% respectively, as compared to Ti alloy without reinforcement. Twin boundaries, pinning of dislocations by BNNTs, and crack bridging were strengthening mechanisms identified in the composites. vi TABLE OF CONTENT CHAPTER

show abstract

Densification, hardness and tribological characteristics of MWCNTs reinforced Ti6Al4V compacts consolidated by spark plasma sintering

Cited by 47 publications

References 66 publications

Investigation of Wear Behavior of Particle Reinforced AL/B4C Composites under Different Sintering Conditions

Investigation of Wear Behavior of Particle Reinforced AL/B4C Composites under Different Sintering Conditions

Ultralow Temperature Densification of a Titanium Alloy by Spark Plasma Sintering

Boron Nitride Nanotube–Reinforced Titanium Composite with Controlled Interfacial Reactions by Spark Plasma Sintering

Contact Info

Product

Resources

About