WITHDRAWN: Mechanical properties and characterization of Al7075 aluminum alloy based ZrO2 particle reinforced metal-matrix composites

Gunasekaran, T.; Vijayan, S.; Prakash, Prem; Satishkumar, P.

doi:10.1016/j.matpr.2020.11.114

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…Metal particles located in the ceramic matrix interact with propagating cracks and cause deflection of the crack, bridging or stopping the cracks. As a consequence, the increasing fracture toughness of the composites has been observed [ 8 , 9 , 10 , 11 , 12 ]. However, it is not the only metal that is so active in improving the fracture behavior of brittle ceramic or intermetallic matrix composites.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Al2O3 Samples and NiAl–Al2O3 Composite Consolidated by Pulse Plasma Sintering

et al. 2021

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The paper describes an investigation of Al2O3 samples and NiAl–Al2O3 composites consolidated by pulse plasma sintering (PPS). In the experiment, several methods were used to determine the properties and microstructure of the raw Al2O3 powder, NiAl–Al2O3 powder after mechanical alloying, and samples obtained via the PPS. The microstructural investigation of the alumina and composite properties involves scanning electron microscopy (SEM) analysis and X-ray diffraction (XRD). The relative densities were investigated with helium pycnometer and Archimedes method measurements. Microhardness analysis with fracture toughness (KIC) measures was applied to estimate the mechanical properties of the investigated materials. Using the PPS technique allows the production of bulk Al2O3 samples and intermetallic ceramic composites from the NiAl–Al2O3 system. To produce by PPS method the NiAl–Al2O3 bulk materials initially, the composite powder NiAl–Al2O3 was obtained by mechanical alloying. As initial powders, Ni, Al, and Al2O3 were used. After the PPS process, the final composite materials consist of two phases: Al2O3 located within the NiAl matrix. The intermetallic ceramic composites have relative densities: for composites with 10 wt.% Al2O3 97.9% and samples containing 20 wt.% Al2O3 close to 100%. The hardness of both composites is equal to 5.8 GPa. Moreover, after PPS consolidation, NiAl–Al2O3 composites were characterized by high plasticity. The presented results are promising for the subsequent study of consolidation composite NiAl–Al2O3 powder with various initial contributions of ceramics (Al2O3) and a mixture of intermetallic–ceramic composite powders with the addition of ceramics to fabricate composites with complex microstructures and properties. In composites with complex microstructures that belong to the new class of composites, in particular, the synergistic effect of various mechanisms of improving the fracture toughness will be operated.

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Section: Introductionmentioning

confidence: 99%

Characterization of Al2O3 Samples and NiAl–Al2O3 Composite Consolidated by Pulse Plasma Sintering

et al. 2021

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“…It is also used in reciprocating and rotating parts like pistons, brake rotors, drive shafts, and other structural elements that require lightweight and high strength materials [7]. According to various studies, adding different reinforcements improves the mechanical properties of Al7075 matrix composites significantly [8]- [10].Compared to other Al alloys, if strength is the most important consideration, then Al7075 is probably the better choice [11]. Shear strength, ultimate tensile strength, fatigue strength, yield strength, and hardness of Al7075 are comparable with those of duralumin alloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of weight of reinforcement and coating thickness on the hardness of stir cast AL7075-nickel coated duralumin powder mmc

Karthik¹,

Sharma²,

Gowrishankar³

et al. 2022

J Appl Eng Science

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In the present work, it is experimented to reinforce duralumin powder (3 to 7 wt %.) into Al7075 matrix by stir casting technique. Since matrix and reinforcement both have almost similar melting temperatures, the least expensive additive manufacturing metallurgical route seems to be the best fit. In this study, an effort was made to produce the Al7075 matrix composite reinforced with duralumin by a novel stir casting method by coating duralumin powders with nickel which has high temperature melting point compared to reinforcement material.. Nickel has good wettability and avoids undesirable chemical reactions between the reinforcement and matrix at higher temperatures, acting as a protector for both the duralumin and matrix. Since, aging kinetics of duralumin (Al2024) and Al7075 are different, both positively respond to heat treatment in a single stretch for property alteration. During stir casting, even though duralumin melts along with the matrix, it will be under the solid protection barrier (coat) of nickel, avoiding dissolution with the Al7075 matrix. To verify the presence of reinforcement duralumin in the matrix and to decide the soundness of the casting produced by stir casting, confirmation tests are made like microstructures with EDS and microhardness distribution. The microstructure analysis of the composite showed an even distribution of nickel coated duralumin in the matrix when the coating thickness of a nickel is greater than 8 µm. The hardness test analysis has shown an improvement in the hardness with the increase in the weight % of the reinforcement. Improvement in the hardness of composites is due to an increase in dislocation number, which shows higher resistance to plastic deformation [2]. Statistical analysis has shown that the coating of reinforcement does not have any significant effect on the mechanical properties. The regression equation is fit to determine the hardness of the composite involving the factors within the range of values considered for this study.

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Microstructure, Hardness and Wear Study of Al7075-B4C Metal Matrix Composites

Rajanish,

Avilasha,

Katti

et al. 2024

J. Inst. Eng. India Ser. D

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WITHDRAWN: Mechanical properties and characterization of Al7075 aluminum alloy based ZrO2 particle reinforced metal-matrix composites

Cited by 6 publications

References 18 publications

Characterization of Al2O3 Samples and NiAl–Al2O3 Composite Consolidated by Pulse Plasma Sintering

Characterization of Al2O3 Samples and NiAl–Al2O3 Composite Consolidated by Pulse Plasma Sintering

Effect of weight of reinforcement and coating thickness on the hardness of stir cast AL7075-nickel coated duralumin powder mmc

Microstructure, Hardness and Wear Study of Al7075-B4C Metal Matrix Composites

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