Comparative study on the mechanical and microstructural characterisation of AA 7075 nano and hybrid nanocomposites produced by stir and squeeze casting

Kannan, C. Ramesh; Ramanujam, R.

doi:10.1016/j.jare.2017.02.005

Cited by 164 publications

(68 citation statements)

References 40 publications

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“…Metal Matrix Composites (MMCs) which comprise wide choice of materials were meant to achieve predominant properties than unreinforced monolithic metals have seen a lot of improvement for a long time because of their promising propelled properties [1]. Although the matrix may be of an alloy or a metal, mechanical properties being the primary objective can be improved by selecting the light structural metals for hybrid metal matrix composites and improvements has been made in the reinforcements used [2].…”

Section: Introductionmentioning

confidence: 99%

Study on formability and strain hardening index: influence of particle size of boron carbide (B₄C) in magnesium matrix composites fabricated by powder metallurgy technique

Rajkumar¹,

Kailasanathan²,

Senthilkumar³

et al. 2020

Mater. Res. Express

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In the present investigation, Magnesium composites have been fabricated with boron carbide (B 4 C) as reinforcement by powder metallurgicaltechnique. Two different particle sizes-micro and nano B 4 C particles with weight percentage of 0%, 5% and 10% has been studied. The green compacts were prepared by cold pressing and then sintering the specimens before being subjected to cold upsetting under triaxial stress state condition in order to study the phenomenon of workability and instantaneous strain hardening index. Powder characterizations are discussed using x-ray Diffraction peaks, Scanning Electron Microscope images and Energy Dispersive Spectrum analysis. Cold upsetting has been preferred to investigate the performance of the composites. The values of formability stress index factor (β σ ), various stress ratio (σ θ /σ eff , σ m /σ eff andσ z /σ m ) parameters and instantaneous strain hardening index (n i ) are observed for increase in % of B 4 C particles and its sizes. The experimental results were analyzed pertaining to relative density. The results reveal that Mg-10% nano B 4 C composite has higher relative density, formability stress index factor and hence high workability than the other composites. The addition of B 4 C particles as reinforcement affects the strain hardening index due to geometric and work hardening of the composites. particles or whiskers with even small volume fractions greatlyimprove the strength and stiffness of the composites [10].Among various reinforcements used with magnesium, boron carbide (B 4 C) is the best because of its low density combined with high hardness, fracture toughness, superior elastic modulus and tremendous wear resistance [11,12]. Because of its better properties, it has extensive applications in nuclear, automobile and aerospace sectors and high skilled applications such as light weight shields, fast-breeders, abrasivegrit, and nozzles, cutting and grinding tools and so on [13][14][15].The popularity of magnesium matrix composites in day-to-day life is delayed because of the cost, which mainly involves the cost of reinforcement particles and the method of fabrication [16]. Hence the potential of magnesium matrix composites with wide variety of reinforcing materials in advanced functional and structural materials needs attention in processing techniques and their features in order to select the suitablefabricationtechnique for that particular composite material. To fabricate magnesium matrix composites, three well-known processing techniques namely Powder Metallurgy (P/M), squeeze casting and stir casting are available [17]. The P/M technique is attractive among others because particlesreinforcedwere evenly distributedin the matrix thereby regulating the microstructure and improving the structural and mechanical properties [18].Al-SiC composites subjected to mechanical, machinability and metallurgical studies reveals that reducing the size of the particle reinforcement increases the life in low cycle fatigue because of cyclic hardening [19]. Relative density of...

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Section: Introductionmentioning

confidence: 99%

Study on formability and strain hardening index: influence of particle size of boron carbide (B₄C) in magnesium matrix composites fabricated by powder metallurgy technique

Rajkumar¹,

Kailasanathan²,

Senthilkumar³

et al. 2020

Mater. Res. Express

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“…The Brinell hardness has been reported to increase for nanocomposites strengthened with single and hybrid reinforcement. Moreover, the tensile strength of single-reinforced nanocomposites obtained through squeeze casting is higher than that of single-reinforced nanocomposites obtained through stir casting [6].…”

Section: Introductionmentioning

confidence: 73%

“…The thermal mismatch between reinforcements and the matrix contributes to a decrease in the UTS. When the nanocomposites were subjected to squeeze casting, increased grain refinement and porosity reduction were achieved [6]. In the squeeze casting process, the squeezing pressure reduced the space between the dendrites, which resulted in the formation of fine grains and a homogeneous microstructure.…”

Section: Physical and Mechanical Properties Of The Compositesmentioning

confidence: 99%

“…Kannan et al examined the mechanical properties and microstructure of aluminium hybrid composites reinforced with nano-alumina. They combined 2 wt% of nano-alumina particles (average particle size: 30-50 nm) and 4 wt% of silicon carbide (average particle size: 5-10 μm) with grade AA7075 aluminium alloy matrix material [6]. The Brinell hardness has been reported to increase for nanocomposites strengthened with single and hybrid reinforcement.…”

Section: Introductionmentioning

confidence: 99%

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A novel approach for the production and characterisation of aluminium–alumina hybrid metal matrix composites

Thiraviam

Ravisankar

K³

et al. 2020

Mater. Res. Express

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In this study, aluminium-alumina hybrid metal matrix composites were developed using stir-squeeze casting with ultrasonic stirring. Scrap aluminium alloy wheels (SAAWs) were used as the matrix material, with 1, 2, and 3 wt% of nanosized alumina ((Al 2 O 3 ) n ) particles as well as 4, 5.5, and 7 wt% of microsized alumina ((Al 2 O 3 ) m ) particles as reinforcement components. An experimental study was conducted using the Taguchi method with an L9 orthogonal array, and the multiobjective optimisation based on ratio analysis technique was used for optimisation. The effects of different ratios of nanosized and microsized alumina particles as well as ultrasonic parameters, namely amplitude and pulse time, on the microstructure and mechanical properties were evaluated and compared. Pin-on-disc wear tests were conducted in the dry condition under uniform load to determine the influence of nanosized and microsized alumina on the wear behaviour. The results revealed that SAAWs reinforced with 1 wt% of nanosized alumina particles and 5.5 wt% of microsized alumina particles and having an amplitude of 100% and pulse on-time of 180 s exhibited lower porosity and metal loss (wear) as well as higher hardness, tensile strength, and compressive strength than other composites.

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“…particle size 30-50 nm) in the molten AA 7075 alloy by squeeze casting with a pressure of 101 MPa. And the other alloy was fabricated by stir casting and reinforced by 4%SiC and 2%, 4% Nano alumina [12].…”

Section: Introductionmentioning

confidence: 99%

An Investigation of the Influence of Nano-Cobalt Oxide on Microstructure and Mechanical Properties of 7075 Aluminium Alloy

Jasim¹,

Tjprc²

2018

IJMPERD

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Aluminium Alloy AA7075 is the strongest heat-treatable aluminium series. For that they have suitable properties and tremendous applications, especially in the aviation and aerospace industries. The effect of a minor Nanocobalt oxide on the microstructures and mechanical properties of AA7075 was investigated in this work.The investigation was carried out as a cast AA7075 with 0.2, 0.4, 0.6 and 0.8% Nano-cobalt. The optical microscopy demonstrates that the grain size of alloys was decreased with the increasing of Nano -cobalt oxide content. The Scanning electron microscopy and EDX show that the cobalt oxide present between the grains at the grain boundary. Moreover, there are Al-Zn-Mg, Al-Fe-Cu, Si-Al-Zn, Al-Fe-Cu-Co-Zn, and Al-o-Si-Zn-Cu compounds.The mechanical properties examination shows that the hardness decreased and yield stress, increased with an increasing in the Nano-cobalt content. The ultimate tensile stress and modulus elasticity also increased with the increase of Nanocobalt content, except alloy with 0.8% Nano-cobalt which decreased to 5.87 GPA.

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Comparative study on the mechanical and microstructural characterisation of AA 7075 nano and hybrid nanocomposites produced by stir and squeeze casting

Abstract: Graphical abstract

Cited by 164 publications

References 40 publications

Study on formability and strain hardening index: influence of particle size of boron carbide (B₄C) in magnesium matrix composites fabricated by powder metallurgy technique

Study on formability and strain hardening index: influence of particle size of boron carbide (B₄C) in magnesium matrix composites fabricated by powder metallurgy technique

A novel approach for the production and characterisation of aluminium–alumina hybrid metal matrix composites

An Investigation of the Influence of Nano-Cobalt Oxide on Microstructure and Mechanical Properties of 7075 Aluminium Alloy

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Comparative study on the mechanical and microstructural characterisation of AA 7075 nano and hybrid nanocomposites produced by stir and squeeze casting

Abstract: Graphical abstract

Cited by 164 publications

References 40 publications

Study on formability and strain hardening index: influence of particle size of boron carbide (B4C) in magnesium matrix composites fabricated by powder metallurgy technique

Study on formability and strain hardening index: influence of particle size of boron carbide (B4C) in magnesium matrix composites fabricated by powder metallurgy technique

A novel approach for the production and characterisation of aluminium–alumina hybrid metal matrix composites

An Investigation of the Influence of Nano-Cobalt Oxide on Microstructure and Mechanical Properties of 7075 Aluminium Alloy

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Product

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Study on formability and strain hardening index: influence of particle size of boron carbide (B₄C) in magnesium matrix composites fabricated by powder metallurgy technique

Study on formability and strain hardening index: influence of particle size of boron carbide (B₄C) in magnesium matrix composites fabricated by powder metallurgy technique