A novel aluminum based nanocomposite with high strength and good ductility

Ramezanalizadeh, Hossein; Emamy, M.; Shokouhimehr, Mohammadreza

doi:10.1016/j.jallcom.2015.07.088

Cited by 33 publications

(13 citation statements)

References 39 publications

(46 reference statements)

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“…Additionally, grain sliding, which is a form of plastic deformation, occurs in nanocomposites. It can suppress the crack formation, thereby leading to an enhancement of the fracture resistance [7,8].…”

Section: Introductionmentioning

confidence: 99%

Fracture Resistance Enhancement in Hard Mo-B-C Coatings Tailored by Composition and Microstructure

Souček

Zábranský

Buršı́ková

et al. 2018

Journal of Nanomaterials

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State-of-the-art protective coatings often suffer from brittleness. Therefore, the coatings are intensively sought which would simultaneously exhibit high hardness and stiffness with moderate ductility and fracture resistance. In this paper, we report on the nanostructure designing of coatings containing metal, boron, and carbon enabling the simultaneous presence of stiff boridic and carbidic bonds together with weaker metallic bonds to provide coatings with these desirable properties. Three designs are presented with different relative amounts of nanocrystalline and amorphous phases, ranging from near-amorphous to prevalently crystalline microstructure. All presented coatings exhibit an unusual combination of high fracture resistance and high hardness that cannot be achieved with state-of-the-art protective coatings. Indentation tests at high loads revealed that no cracks are present at the surface of the investigated coatings while state-of-the-art ceramic protective coatings already exhibit significant cracking. Cracks in the bulk of the presented coating are detected only when the deformation is so severe that the substrate itself fails.

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Section: Introductionmentioning

confidence: 99%

Fracture Resistance Enhancement in Hard Mo-B-C Coatings Tailored by Composition and Microstructure

Souček

Zábranský

Buršı́ková

et al. 2018

Journal of Nanomaterials

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“…In the present study, the strengthening mechanism of the Al-Y 2 O 3 nanocomposites mainly depended on dispersion hardening due to the hard yttria particles present in the aluminum matrix. The increase in strength and hardness may be attributable to Orowan strengthening [44,45].…”

Section: Compressive Analysis Of Al-y 2 O 3 Nanocompositesmentioning

confidence: 99%

Microstructure and Compressive Behavior of Al–Y2O3 Nanocomposites Prepared by Microwave-Assisted Mechanical Alloying

Mattli

Shakoor

Reddy

et al. 2019

Metals

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In this study, Al-Y 2 O 3 nanocomposites were synthesized via mechanical alloying and microwave-assisted sintering. The effect of different levels of yttrium oxide on the microstructural and mechanical properties of the Al-Y 2 O 3 nanocomposites were investigated. The density of the Al-Y 2 O 3 nanocomposites increased with increasing Y 2 O 3 volume fraction in the aluminum matrix, while the porosity decreased. Scanning electron microscopy analysis of the nanocomposites showed the homogeneous distribution of the Y 2 O 3 nanoparticles in the aluminum matrix. X-ray diffraction analysis revealed the presence of yttria particles in the Al matrix. The mechanical properties of the Al-Y 2 O 3 nanocomposites increased as the addition of yttria reached to 1.5 vol. % and thereafter decreased. The microhardness first increased from 38 Hv to 81 Hv, and then decreased to 74 ± 4 Hv for 1.5 vol. % yttria. The Al-1.5 vol. % Y 2 O 3 nanocomposite exhibited the best ultimate compressive strength and yielded a strength of 359 ± 7 and 111 ± 5 MPa, respectively. The Al-Y 2 O 3 nanocomposites showed higher hardness, yield strength, and compressive strength than the microwave-assisted mechanically alloyed pure Al.

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“…Where G is the shear modulus of Al, b is the Burgers vector of Al, d is the average diameter of nanoparticles, and λ is the interparticulate distance between the reinforcement particles, which is given by the following equation [36]. It can be seen that the yield strength (YS) and ultimate compressive strength (UCS) significantly increase with the addition of amorphous Si 3 N 4 content.…”

Section: Lnmentioning

confidence: 99%

Structural and Mechanical Properties of Amorphous Si3N4 Nanoparticles Reinforced Al Matrix Composites Prepared by Microwave Sintering

et al. 2019

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The present study focuses on the synthesis and characterization of amorphous silicon nitride (Si3N4) reinforced aluminum matrix nanocomposites through the microwave sintering process. The effect of Si3N4 (0, 1, 2 and 3 wt.%) nanoparticles addition to the microstructure and mechanical properties of the Al-Si3N4 nanocomposites were investigated. The density of Al-Si3N4 nanocomposites increased with increased Si3N4 content, while porosity decreased. X-ray diffraction (XRD) analysis reveals the presence of Si3N4 nanoparticles in Al matrix. Microstructural investigation of the nanocomposites shows the uniform distribution of Si3N4 nanoparticles in the aluminum matrix. Mechanical properties of the composites were found to increase with an increasing volume fraction of amorphous Si3N4 reinforcement particles. Al-Si3N4 nanocomposites exhibits higher hardness, yield strength and enhanced compressive performance than the pure Al matrix. A maximum increase of approximately 72% and 37% in ultimate compressive strength and 0.2% yield strength are achieved. Among the synthesized nanocomposites, Al-3wt.% Si3N4 nanocomposites displayed the maximum hardness (77 ± 2 Hv) and compressive strength (364 ± 2 MPa) with minimum porosity level of 1.1%.

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A novel aluminum based nanocomposite with high strength and good ductility

Cited by 33 publications

References 39 publications

Fracture Resistance Enhancement in Hard Mo-B-C Coatings Tailored by Composition and Microstructure

Fracture Resistance Enhancement in Hard Mo-B-C Coatings Tailored by Composition and Microstructure

Microstructure and Compressive Behavior of Al–Y2O3 Nanocomposites Prepared by Microwave-Assisted Mechanical Alloying

Structural and Mechanical Properties of Amorphous Si3N4 Nanoparticles Reinforced Al Matrix Composites Prepared by Microwave Sintering

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