Microstructure and mechanical properties of Y2O3 reinforced Ti6Al4V composites fabricated by spark plasma sintering

Li, Ang; Shuan, MA; Yang, Yanjie; Zhou, Shiqi; Lan, Shi; Liu, Mabao

doi:10.1016/j.jallcom.2018.07.229

Cited by 38 publications

(15 citation statements)

References 24 publications

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“…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%

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Ultralow Temperature Densification of a Titanium Alloy by Spark Plasma Sintering

et al. 2020

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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.

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Section: Significance Of Low-temperature Sintering Of Ti6al4vmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultralow Temperature Densification of a Titanium Alloy by Spark Plasma Sintering

et al. 2020

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“…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%).…”

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confidence: 99%

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

Bustillos

Nautiyal

et al. 2020

Adv Eng Mater

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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

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“…[1][2][3][4][5]. Composites with unique properties can be prepared by various techniques; the bases include casting and powder metallurgy [6][7][8][9]. Carro et al [10] fabricated Cu-Y 2 O 3 dispersion strengthened composite by two different routes: casting and powder metallurgy (cryomilling and mechanical alloying).…”

Section: Introductionmentioning

confidence: 99%

Microstructure and fracture mechanism of Cu-Y2O3 composite

Velgosová¹,

Nagy²,

Besterci³

et al. 2020

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This work aimed to examine the structure of Cu-Y2O3 composite, analyse the fracture mechanism, and propose the model of fracture. The in-situ tensile test in SEM was used for direct observation of the process of deformation and fracture. Microscopic analysis revealed that Cu matrix grains are spherical with a mean diameter of ∼ 500 nm. EDX and selected area electron diffraction confirmed the presence of Y2O3 particles. Particles can be divided, according to the size, into two categories: smaller A (up to 20 nm) and more significant B (20-100 nm). The in-situ tensile test in SEM showed that the first cracks were created on the particle-matrix interfaces and in the triple point. Subsequent coalescence was observed, and we assumed that the cracks propagate along the grain boundaries. The fracture surface has a transcrystalline ductile character. Based on the in-situ observations and analysis, we proposed the model of fracture mechanism.

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Microstructure and mechanical properties of Y2O3 reinforced Ti6Al4V composites fabricated by spark plasma sintering

Cited by 38 publications

References 24 publications

Ultralow Temperature Densification of a Titanium Alloy by Spark Plasma Sintering

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

Microstructure and fracture mechanism of Cu-Y2O3 composite

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