Fatigue Behavior of Ni-P Coated Si 3 N 4 Reinforced Al6061 Composites

Ramesh, C.S.; Keshavamurthy, R.; Madhusudhan, J.

doi:10.1016/j.mspro.2014.07.124

Cited by 38 publications

(18 citation statements)

References 31 publications

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“…The Al 2 O 3 -SiC particulates may get crushed to powder form to maintain the wear resistance as detected in the results of wear rate [32,33]. Similar results have been noticed [5] and it is concluded that, from the analysis it is seen that, the SEM analysis of worn-out surfaces of the MMCs (Al7075 + 2%Al 2 O 3 + 3%SiC) is different from that of Al7075 + 5%Al 2 O 3 + 7%SiC composite. [34].…”

Section: Morphological Analysissupporting

confidence: 68%

Investigations on tensile fractography and wear characteristics of Al7075-Al2O3-SiC Hybrid Metal Matrix Composites routed through liquid metallurgical techniques

Ravikumar¹,

Suresh

Reddappa

et al. 2021

Frattura Ed Integrità Strutturale

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The Al2O3-SiC reinforced Al7075 Metal Matrix Composite (MMCs) is fabricated through liquid metallurgical technique. Ceramic particulates were amalgamated into aluminium alloy to achieve improved mechanical properties and wear resistance. Al-7075/Al2O3/SiC hybrid MMCs were produced by reinforcing 2%, 3%, 4% and 5% of Al2O3 and 3%, 5% and 7% of SiC particles. Microstructural analysis was carried out to evaluate the uniform dispersal of reinforcing particulates within the base matrix. The output results indicate that the mechanical properties of the hybrid MMCs enhanced by increase the wt. % of ceramic particulates. Tensile fractography results show the internal fracture structure of the tensile test specimens in which the particulates fracture and pullouts were observed. The wear characteristics of developed composites are studied using pin on disc apparatus. The high wear resistance is observed at 5% Al2O3 + 7% SiC reinforced MMCs.

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Section: Morphological Analysissupporting

confidence: 68%

Investigations on tensile fractography and wear characteristics of Al7075-Al2O3-SiC Hybrid Metal Matrix Composites routed through liquid metallurgical techniques

Ravikumar¹,

Suresh

Reddappa

et al. 2021

Frattura Ed Integrità Strutturale

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“…Here we see a potential for a significant increase in the specific modulus through small additions of Si 3 N 4 fibre. The tensile values demonstrated that the addition of hard Si 3 N 4 reinforcement increases the strength of the Alumix123 matrix through increased resistance to tensile stresses [22], with a minor reduction in ductility. The larger (than expected) variation in the tensile test results is due to the nature of the PM test specimens which are unmachined.…”

Section: Elastic Modulusmentioning

confidence: 96%

“…Si 3 N 4 is a low density (3.1 g/cm 3 ) ceramic material with high mechanical strength and hardness, good thermal and chemical stability, and good wear and corrosion resistance. It is of current interest as reinforcement in the manufacturing of MMCs [19][20][21][22]. Several works have been reported on fabrication and mechanical characterisation of aluminium matrix composite reinforced with Si 3 N 4 particles.…”

Section: Introductionmentioning

confidence: 99%

Properties and characterization of an aluminium–silicon nitride fibre powder metal composite

Dougherty¹,

Xu²

2018

SN Appl. Sci.

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In this article, we fabricated one-dimensional 0.5 vol% silicon nitride (Si 3 N 4) fibre reinforced Alumix123 matrix composites by the powder metallurgy method. Si 3 N 4 is a ceramic material with high strength, stiffness and low coefficient of thermal expansion. The Si 3 N 4 used in the study is comprised of single crystal fibres with sub-micrometre diameter and length < 25 μm. The size of the fibre is smaller than the metal matrix powder allowing it to coat the metal powder before consolidation rather than forming agglomerations that might lead to pores and poor mechanical properties. We investigated the effects of Si 3 N 4 fibre additions on the densification, hardness, elastic modulus and tensile strength. The experimental results found that the Si 3 N 4 fibre effectively enhanced the mechanical properties of the composites at low additions. The microstructural analysis clearly shows the Si 3 N 4 fibres in the sintered grain boundaries. The interface between the fibre and the Alumix123 matrix showed good wetting and bonding with only minimal reaction. The Si 3 N 4 fibre reinforced Alumix123 composites have potential uses in the automobile and aerospace industries due to their improved specific mechanical properties.

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“…Aluminum matrix composites when reinforced with hard ceramic particles replace monolithic materials and finds a wide range of application in automobile, transportation, defense and aerospace industries due to its improved properties such as high strength, improved wear resistance, high corrosion resistance, low density, heat treatment capability, high elastic modulus, high strength-to-weight ratio and high thermal conductivity [1][2][3][4]. Among the 7xxx series aluminum alloys, AA7068 is one of the most famous one which provides high strength and improved mechanical properties [5].…”

Section: Introductionmentioning

confidence: 99%

Microhardness and Microstructural Behavior of AA7068/SiC Metal Matrix Composites Synthesized by Powder Metallurgy

Joshua¹,

Ramkumar

Vijay

et al. 2020

Lecture Notes in Mechanical Engineering

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If anybody is missing any arm or leg, a prosthetic limb can be replaced to take care of their activities by themselves. Manufacturing of prosthetic limbs for such persons should be lightweight and requires improved hardness. Hence, silicon carbide (SiC) was incorporated into aluminum alloy (AA7068) to produce composites by powder metallurgy technique with different weight percentages of SiC (3, 6 and 9%) along with base alloy. A compaction pressure of 318 MPa was applied and sintered at a temperature of 560°C for an hour. Vickers microhardness test was carried out to find out the microhardness values. Wear experiments were conducted with a velocity of 1.2 m/s over a sliding distance of 2.5 km of load 5 N. Field emission scanning electron microscopy (FESEM) analysis was carried out to investigate the worn surface. Experimental results showed that the Vickers microhardness number has been increased to a maximum of 55 VHN by the addition of 9% SiC particles which were 66.7% more than the base alloy. Wear experiments exposed an improved wear resistance by the addition of SiC particles. AA7068-9% SiC composite exhibited maximum wear resistance. FESEM analysis revealed that abrasion and oxidation were the predominant wear modes for the produced AA7068/SiC composites. The prosthetic limb produced using such composite combination would be lightweight with the improved hardness which would serve the persons better to perform their daily activities.

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Fatigue Behavior of Ni-P Coated Si 3 N 4 Reinforced Al6061 Composites

Cited by 38 publications

References 31 publications

Investigations on tensile fractography and wear characteristics of Al7075-Al2O3-SiC Hybrid Metal Matrix Composites routed through liquid metallurgical techniques

Investigations on tensile fractography and wear characteristics of Al7075-Al2O3-SiC Hybrid Metal Matrix Composites routed through liquid metallurgical techniques

Properties and characterization of an aluminium–silicon nitride fibre powder metal composite

Microhardness and Microstructural Behavior of AA7068/SiC Metal Matrix Composites Synthesized by Powder Metallurgy

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