Reinforced Hybrid Metal Matrix Composites Research Articles

Investigations of fatigue crack growth rate behaviour and life prediction of Si3N4/TiB2 reinforced hybrid metal matrix composites

Many engineering structures and components experience complex fatigue loading throughout their operational lifespan. Economically, it is crucial to forecast the remaining lifespan to prevent catastrophic failure by implementing appropriate inspection schedules. The aim of present work is to investigate the fatigue, and fracture performances of AA7075 alloy-based hybrid MMCs containing Si3N4/TiB2 reinforcement. The composite samples are made by a liquid-state stir-casting process. The study examines the fatigue characteristics of manufactured Hybrid Metal Matrix Composites (HMMCs) by analyzing fatigue crack propagation and fracture toughness under constant amplitude loading with a uniform load ratio of 0.1. The potential influence of reinforcement particles on the fatigue durability of HMMCs was predicted through the application of an 'Exponential Model'. A comparison between the model's performance and experimental findings was carried out. The study suggests that the exponential model accurately predicts fatigue life, showing a maximum percentage deviation of −4.96 %, in close agreement with experimental findings. The fatigue crack growth rate (da/dN) and crack opening displacement (COD) of HMMC indicate that the fatigue life and fracture toughness improve with increase in TiB2 content, up to 6 wt%. The fabricated HMMC with 4wt% Si3N4 and 6 wt% TiB2 particulates demonstrated the highest resistance to fracture and longest fatigue life among others HMMCs and base alloy.

Investigation on mechanical behavior of Al6061- coconut shell ash- granite dust reinforced hybrid metal matrix composites manufactured using stir casting technique

Owing to the superior qualities, aluminum metal matrix composites (AMMC) have recently been accepted and suggested as a replacement for traditional materials in a variety of sectors, including automotive, agriculture, aerospace, sports, marine, and many more. To satisfy the industrial requirement, it is necessary to develop economical material with higher mechanical properties like strength, hardness, impact resistance etc. To minimise the environmental impact and depletion of natural resources , it is necessary to Reduce, Recycle and Resuse the solid waste created across the world. This work aims to study the mechanical behavior of hybrid composite of Al6061 reinforced with coconut shell ash (CSA) and granite dust solid waste. Hybrid composite specimens were successfully manufactured using stir casting method. The proportion of granite dust was kept constant at 2 wt percent, whereas the percentage of CSA varied, ranging from 0% to 12% with a multiple of 3. Tests for tension, compression, hardness, and impact were performed to examine the mechanical behavior of the created hybrid composites. SEM & EDAX analysis were carried out to study the microstructure and elemental composition of the hybrid composites. Experimental testing shows that, when the percentage of CSA in the hybrid composite increased, its tensile strength, compressive strength, hardness, and impact strength increased maximum upto 23.65%, 10.12%, 60.89% and 17.38% respectively as compared to base alloy. The experimental findings demonstrated that when compared to matrix and other hybrid composites, the Al6061 alloy reinforced with 2% granite dust and 12% CSA hybrid composite had superior mechanical properties.

Al6061-Basalt and Zircon Hybrid composite Material Corrosion Resistance in Acid Media

The present investigation is an attempt made to develop Al6061/Basalt/Zirconium oxide Hybrid Metal Matrix Composites (MMCs) by liquid metallurgy technique (stir casting) and to study the wear properties of Al6061/Basalt/Zirconium oxide reinforced hybrid metal matrix composites. The composite is prepared by using Liquid Metallurgy Route (Stir Casting Technique), although other processing technique such as powder metallurgy delivers better mechanical properties in MMCs, Liquid state has some significant focal points, for example, better matrix molecule holding, simpler control of matrix structure, ease of handling, closer to net shape and wide choice of material. Al6061 is taken as a base material (matrix) and Basalt (1– 10%) and Zirconium oxides (2%) are used as reinforcements. Corrosion analysis for Aluminum Metal Matrix Composites (MMCs) was done in acid (HCl) media at room temperature & different time intervals. The results were tabulated & it was found that the MMC containing 4% basalt underwent maximum corrosion at room temperature. SEM is done for all the samples the results are tabulated.

Chip profile studies on SiC reinforced mono and SiC and graphite reinforced hybrid ZA43 MMCs

ABSTRACT This paper depicts an experimental model for investigating the mechanism and nature of chip formation during the machining of Zinc-Aluminium alloy-based SiC reinforced mono and SIC and graphite reinforced hybrid metal matrix composites. The stir casting process is followed for the fabrication of both categories of composites. The morphology of the fabricated specimen tells the uniform distribution of reinforcing particles. Machining trials are done on mono and hybrid composites using coated carbide tool. The chips produced during the machining process are carefully collected and examined for their nature and shape. It is concluded that mono composite materials show lengthier chips than hybrid composite materials. The machining parameters and material composition influence the chip formation process. Due to retained ductility in the mono composites, lengthier chips are produced and hybrid composite being more brittle than mono composite material produces short segmental chips.

Investigation on mechanical properties of Al319– Al2O3 – TiO2 reinforced hybrid metal matrix composites

This development activity describes the assessment or manufacturing of mechanical characteristics of AMMCs. Al 319 was added with alumina and titanium dioxide by stir casting method. Alumina and titanium dioxide added with Al 319 in quantity of 2%, 4% and 6 wt%. In this development activity mechanical characteristics such as tensile and impact energy analysed. In parallel with improving quantity of Al2O3 and TiO2, value of hardness and tensile strength were increase and value of impact energy were diminish with enhancing quantity of alumina and titanium dioxide. The optical micrographs impart the varying distribution of alumina and titanium dioxide particles in Al 319 matrix. The present learning is expected that the developed composite will be advantages for light weight evolution in automotive components such as brake rotor.

WITHDRAWN: Corrosion resistance of Al6061-basalt natural filler and zircon hybrid composite material in acid media

The present investigation is an attempt made to develop Al6061/Basalt/Zirconium oxide Hybrid Metal Matrix Composites (MMCs) by liquid metallurgy technique (stir casting) and to study the wear properties of Al6061/Basalt/Zirconium oxide reinforced hybrid metal matrix composites. The composite is prepared by using Liquid Metallurgy Route (Stir Casting Technique), although other processing technique such as powder metallurgy delivers better mechanical properties in MMCs, Liquid state has some significant focal points, for example, better matrix molecule holding, simpler control of matrix structure, ease of handling, closer to net shape and wide choice of material. Al6061 is taken as a base material (matrix) and Basalt (1–10%) and Zirconium oxides (2%) are used as reinforcements. Corrosion analysis for Aluminum Metal Matrix Composites (MMCs) was done in acid (HCl) media at room temperature & different time intervals. The results were tabulated & it was found that the MMC containing 4% basalt underwent maximum corrosion at room temperature. SEM is done for all the samples the results are tabulated.

Wear, optimization and surface analysis of Al-Al2O3-TiO2 hybrid metal matrix composites

The aim of the present work is to investigate vickers hardness, wear behavior as well as to perform optimization of wear data for pure Al and Al-Al2O3-TiO2 hybrid metal matrix composites. The hybrid composite (Al-Al2O3-TiO2) was prepared by mechanical stir casting with equal proportion of reinforcement (2.5, 5.0, 7.5 and 10 wt.%). Vickers hardness, wear behavior and its optimization using ANOVA as well as TOPSIS along with the microstructure of the worn surface of prepared sample has been investigated. Vickers hardness increases with an increase in weight percentage of reinforcements. Wear test was carried out under dry sliding condition by pin-on-disc wear machine according to the ASTM G99-95a standard. Wear properties of the sample have been obtained at different percentages of reinforcement. Wear resistance of the hybrid composite increases with the variation of percentage of titanium oxide particles due to its lubricating properties. ANOVA shows that the reinforcements and load have different effect on samples wear rate. TOPSIS analysis shows rank of the sample according to its wear rate. Worn surface morphology was investigated and it showed deep grooves, more debris, delamination and rough surface in pure Al sample as compared to the high percentage of reinforced hybrid metal matrix composites.

Mechanical Characterization of Stir Cast Al-7075/B4C/Graphite Reinforced Hybrid Metal Matrix Composites

Abstract The modern technology requires the materials with light weight, high strength, high stiffness and superior mechanical properties. The mechanical properties of metal matrix composites (MMCs) are critical to their potential application as structural materials. A systematic examination is required to study the effect of particulate weight fraction on the mechanical properties. Aluminium based metal matrix composites find varied applications in aerospace, defence, automobile, sports equipment and electronics due to their favourable properties. Al 7075 is a light weight castable alloy with moderate hardness and strength and finds applications in automotive and aerospace. The addition of refractory reinforcement generally improves the hardness, tensile strength and high temperature properties of the material. The present investigation focuses on characterization of Stir cast Al-7075/B4C/Graphite reinforced Hybrid Metal Matrix Composites. Adding B4C with varying reinforcement of three cases, in first case 2% constant with varying graphite 1%, 3%, and 5%, in second case 4%, and in third case 6% constant with varying same graphite percentage, the aluminum matrix hybrid composites have been fabricated by stir-casting method at 650 °C. Castings for tensile testing were prepared in circular metal mold of diameter 20 mm and length 120 mm. The specimens of 55×10×10 mm with 2 mm notch for impact test, 20×10×10 mm for microscopy analysis and hardness test are cut from a cast ingot of 100×50×10 mm using CNC EDM wire cutting. Specimens are prepared as per the ASTM standards and Microstructure investigation, ultimate tensile strength, impact strength and hardness measurements have been correlated with the percentage of B4C and Graphite particles. The effects of B4C and Graphite particle content on the mechanical properties were investigated. The grain size by using the mean intercept length method, Standard deviation and 95% confidence intervals were determined at different weight fractions.

Comparative Surface Morphology of Machined Hybrid and Unhybrid Zinc-Aluminum Alloy-Based Metal Matrix Composites

The present article reveals the surface characteristics of zinc-aluminum alloy (ZA43) reinforced with silicon carbide (SiC) particulate conventional composite and SiC+Graphite dual reinforced hybrid metal matrix composites. Both the composites were prepared using a liquid metallurgy technique. A base alloy of metal matrix composites (MMC) containing zinc—57 %, aluminum—43 % was reinforced with SiC (5 %) with an average particle size of 60 μm and hybrid composite with 5 % SiC and 5 % graphite. The coated carbide tool SNMG was used to machine the two varieties of composites under dry condition. Machining parameters were considered at three different levels, keeping a constant depth of cut. It was observed from the results that the surface finish was greatly influenced by cutting speed and feed. Unhybridized composites exhibit (without graphite) higher roughness values than composites with graphite during the machining trials. The reasons for higher roughness values include particle pullout, particle fracture, and built-up edge formation on the cutting tool during the machining process.

A study on microstructural effect and mechanical behaviour of Al6061–5%SiC–TiB2 particulates reinforced hybrid metal matrix composites

In this present work, an attempt is made to prepare Al6061–5%SiC–TiB2 hybrid composites using stir casting process by considering optimal process parameters such as stirring temperature, stirring speed, stirring time, preheating temperature, grain size and wt% of particulate reinforcement and examine their metallurgical effect and mechanical behaviour. The metal composite samples were prepared using stir casting process in which the amount of reinforcement of 5%SiC is kept constant, and second reinforcement of TiB2 is varied by its weight fraction of 2, 4, 6, 8 and 10%. The prepared dual particulates reinforced hybrid composites are characterised, and their microstructural, mechanical properties and fractograpy were evaluated as per the standards. Strong interfacial bonding between matrix and reinforcements which are the significance of improved wettability is due to Potassium Hexafluorotitanate salt addition, and preheating of particles of SiC at 800℃ and TiB2 at 250℃ is made before adding into the melt. The results revealed that the increase in addition of TiB2 increases the tensile strength, flexural strength, impact strength and hardness by decreasing their weight density, and also the influence of SiC increases the hardness of the material of newly developed composite. Also, fracture morphology of tensile failure has been studied to examine micro-mechanisms of failure, and the mode of failure of the composites was found to be ductile.

EXPERIMENTAL STUDIES ON MECHANICAL PROPERTIES OF EGLASS SHORT FIBRES & FLY ASH REINFORCED AL 7075 HYBRID METAL MATRIX COMPOSITES

Conventional monolithic materials have limitations in achieving good combination of strength, stiffness, toughness and density. To overcome these shortcomings and to meet the ever increasing demand of modern day technology, composites are most promising materials of recent interest. Metal matrix composites (mmcs) possess significantly improved properties including high specific strength, specific modulus, damping capacity and good wear resistance compared to unreinforced alloys. Among the mmc’s aluminum composites are predominant in use due to their low weight and high strength. The key features of mmc’s are specific strength and stiffness, excellent wear resistance, high electrical and thermal conductivity. The present investigation aims at the development of aluminium based e-glass and flyash particulate reinforced hybrid metal matrix composites. The test specimens are prepared as per astm standard size by turning and facing operations to conduct tensile and compression test.

EXPERIMENTAL STUDIES ON MECHANICAL PROPERTIES OF E-GLASS SHORT FIBRES & FLY ASH REINFORCED AL 7075 HYBRID METAL MATRIX COMPOSITES

Conventional monolithic materials have limitations in achieving good combination of strength, stiffness, toughness and density. To overcome these shortcomings and to meet the ever increasing demand of modern day technology, composites are most promising materials of recent interest. Metal matrix composites (MMCs) possess significantly improved properties including high specific strength, specific modulus, damping capacity and good wear resistance compared to unreinforced alloys. Among the MMC’s aluminum composites are predominant in use due to their low weight and high strength. The key features of MMC’s are specific strength and stiffness, excellent wear resistance, high electrical and thermal conductivity. The present investigation aims at the development of Aluminium based E-Glass and Flyash particulate reinforced hybrid metal matrix composites. The test specimens are prepared as per ASTM standard size by turning and facing operations to conduct tensile and compression test.