Aluminum matrix composites reinforced with multi-walled boron nitride nanotubes fabricated by a high-pressure torsion technique

Xue, Yanming; Jiang, Xiangfen; Bourgeois, Laure; Dai, Pengcheng; Mitome, Masanori; Zhang, Chao; Yamaguchi, Mitsugu; Matveev, Andrei T.; Tang, Cheng Chun; Bando, Yoshio; Tsuchiya, Koichi; Golberg, Dmitri

doi:10.1016/j.matdes.2015.08.162

Cited by 74 publications

(31 citation statements)

References 28 publications

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“…However, more energy and time are needed. While SPD processes such as equal channel angular pressing (ECAP) [12,13], accumulative roll bonding (ARB) [14][15][16][17], and high-pressure torsion (HPT) [18] have been found to improve the consolidation process and distribution of the particles, several other innovative methods such as torsion extrusion (TE) [19], ECAP with back pressure [20], ECAP incorporating with torsion (T-ECAP) [21], and high pressure double torsion (HPDT) [3] have been even more effective. In particular, HPDT was found to enhance distribution of SiC in a Cu matrix [3] as well as to improve crystallographic texture homogeneity [22].…”

Section: Introductionmentioning

confidence: 99%

Compressive, shear, and fracture behavior of CNT reinforced Al matrix composites manufactured by severe plastic deformation

et al. 2016

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In this work, carbon nanotubes (CNTs) reinforced aluminum (Al) matrix composites are synthesized using Bc equal-channel angular extrusion (ECAP) route and their mechanical behavior is examined under compression and shear deformation. The results show that at room temperature, eight ECAP passes are necessary to achieve the density of the composite where the effect of CNTs in enhancing the mechanical properties become significant. Samples of pure Al are also processed under the same ECAP conditions, and their properties are further examined to facilitate the comparison. The well-densified composites with only 2 vol. % of CNTs exhibit an approximately 30% increase in yield strength compared to the pure Al samples. Microstructure data in terms of porosity volume fraction, crystallite size, and dislocation density, along with the residual lattice strain measurements, are used to explain the observed improvements in strength. As measured by X-ray diffraction (XRD), higher levels of dislocation density, smaller crystallite sizes, and larger residual lattice strains are present in Al-CNT than in pure Al samples. Finally, fractographic analysis using scanning electron microscopy is performed revealing that the fracture surfaces of the composite exhibit a more brittle behavior than pure Al samples.

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Section: Introductionmentioning

confidence: 99%

Compressive, shear, and fracture behavior of CNT reinforced Al matrix composites manufactured by severe plastic deformation

et al. 2016

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“…It is clear from the previous efforts 32,47,48,50,55,57,67 that the addition of BNNTs to the Powder metallurgy routes such as SPS are techniques which require an initial feedstock material in the form of a powder. The homogenous dispersion of BNNTs has been previously attained by ball milling processes, and solvent assisted dispersion routes 44,47,54,68 .…”

Section: Current Challengesmentioning

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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“…Already, researchers have proven BNNTs as feasible structural reinforcements of Al‐matrix composites by physical vapor deposition, molten fabrication, severe plastic deformation techniques, hot working, and powder metallurgy techniques . Al‐BNNT composites manufactured by melt spinning, magnetron sputtering, and high‐pressure torsion techniques have exhibited remarkable improvements in tensile stress, two to nine times greater than unreinforced aluminum. Studies employing spark plasma sintering (SPS) in the fabrication of Al‐BNNT composites have also shown significant improvements in mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Strengthening in Boron Nitride Nanotube Reinforced Aluminum Composites Prepared by Roll Bonding

et al. 2018

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Boron Nitride Nanotube (BNNT) is a promising reinforcement for developing strong and lightweight metal matrix composites due to its brilliant mechanical properties and excellent high-temperature oxidation resistance. In this study, layered composites of aluminum and BNNT are fabricated by a multistep process comprising of hot pressing, rolling, and annealing. Less than 0.1 wt% of ultra-long nanotubes (up to 200 μm in length) are used to induce superior strengthening. For achieving enhanced mechanical properties, nanotubes are de-agglomerated and chemically dispersed in an aqueous solution before introducing between the layers of aluminum sheets. Application of pressure (up to 10 MPa) and temperatures (up to 300 C) during rolling and hot pressing induces a bonding between aluminum sheets and nanotubes. Scanning electron microscopy reveals that the nanotubes survive these conditions, suggesting superior thermal and mechanical endurance of BNNT. The nanohardness and elastic modulus of the composites are found to improve by 52% and 17%, respectively, by merely 0.045 wt% BNNT addition. BNNT reinforced composites exhibit up to 13% improvement in ultimate tensile strength. The improvement in mechanical properties is ascribed to effective load transfer from the aluminum matrix to the long nanotubes via interfacial shear stress and enhancement of dislocation density.

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Aluminum matrix composites reinforced with multi-walled boron nitride nanotubes fabricated by a high-pressure torsion technique

Cited by 74 publications

References 28 publications

Compressive, shear, and fracture behavior of CNT reinforced Al matrix composites manufactured by severe plastic deformation

Compressive, shear, and fracture behavior of CNT reinforced Al matrix composites manufactured by severe plastic deformation

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

Strengthening in Boron Nitride Nanotube Reinforced Aluminum Composites Prepared by Roll Bonding

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