Metallography &amp;amp; Bulk Hardness of Artificially Aged Al6061-B&lt;sub&gt;4&lt;/sub&gt;C-SiC Stir Cast Hybrid Composites

Sharma, Sathyashankara; Jagannath, K; Prabhu, P R; Gowri, S.; Harisha, S R; Kini, U. Achutha

doi:10.4028/www.scientific.net/msf.880.140

Cited by 9 publications

(8 citation statements)

References 9 publications

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“…It was apparent that SiC and B4C particles in the Al6061 alloy accelerated the ageing kinetics compared to unreinforced alloy during age-hardening treatment. This is primarily due to the existence of areas with a large dislocation concentration between the matrix alloy and the reinforcement interface, which contributes to heterogeneous nucleation sites and a high diffusivity path for the precipitation of secondary rich precipitates [3,13,14]. Similar to Al6061 matrix alloy, HMMC is very profound to age hardening regardless of 100 or 200 °C temperature.…”

Section: Effect Of Reinforcement and Ageing Temperature On Hardness Propertiesmentioning

confidence: 99%

“…Aluminium, copper, lead, magnesium, nickel, and titanium, and their alloys are significant non-ferrous metals and alloys. Age hardening is the prominent heat treatment process used to increase the specific strength of several aluminium alloys [1][2][3]. The primary purpose of ageing treatment of these alloys (Al-Mg-Si) is to obtain a systematically growing enormous number of uniformly distributed fine intermediate precipitates (Mg2Si) in the matrix.…”

Section: Introductionmentioning

confidence: 99%

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Tribolayer Behaviour and Wear of Artificially Aged Al6061 Hybrid Composites

Shettar

Hiremath

Shankar

et al. 2021

IJAME

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The current work focuses on enhancing wear resistance due to the presence of reinforcements and the effect of ageing treatment on hybrid composites of Al6061-SiC+B4C. By varying weight percentage, two kinds of reinforcements, viz. silicon carbide and boron carbide, were prepared for hybrid composites by the liquid state process known as the method of stir casting. The solutionising temperature of 550 °C for 2 hours and ageing temperature of 100-200°C at different time intervals were used for both Al6061 alloy and its composites during heat treatment. Microstructural and mechanical characterisation were carried out using a standard testing procedure. Compared to Al6061 matrix alloy, artificially peak aged composites show 100-140% improvement in hardness due to harder reinforcements and precipitation of solute rich secondary phases during ageing treatment. Overall, an 80-100% increase in wear resistance observed during peak ageing of hybrid composites. Analysis of Al6061 matrix alloy wear out surface shows extensive grooving and ploughing of the surface with the matrix material smear at many spots. The presence of tribolayer in Al6061-SiC+B4C composites shows a smoother surface than the Al6061 matrix alloy, which results in an excellent lubrication effect during an improvement in wear resistance. The wear surface of base aluminium alloy doesn’t show the existence of iron in the tribolayer. The research work is significant in forming a thermally activated wear-resistant metallic tribolayer with good tribological properties.

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Section: Effect Of Reinforcement and Ageing Temperature On Hardness Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tribolayer Behaviour and Wear of Artificially Aged Al6061 Hybrid Composites

Shettar

Hiremath

Shankar

et al. 2021

IJAME

View full text Add to dashboard Cite

show abstract

“…It was observed that the increase in hardness of the composite was mainly owed to the existence of harder SiC and B 4 C particles in the matrix alloy, which act as obstacles to the dislocation motion. Sharma et al [21] examined the metallography and bulk hardness of artificially aged Al6061-B 4 C-SiC stir cast hybrid composites. A significant improvement in hardness, tensile strength, and a marginal decrease in ductility of hybrid composites were observed compared to aluminum alloy.…”

Section: Introductionmentioning

confidence: 99%

Role B4C Addition on Microstructure, Mechanical, and Wear Characteristics of Al-20%Mg2Si Hybrid Metal Matrix Composite

et al. 2021

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In the current study, the effect of different B4C additions (0, 2.5, 5, and 10 wt%) on the microstructural, solidification behavior, mechanical, and tribological properties of Al-20%Mg2Si composite were studied by means of scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Vickers hardness, tensile, and dry sliding wear tests. The cooling curve thermal analysis (CCTA) approach was utilized to monitor the influence of B4C particles on the solidification behavior of Al-20%Mg2Si composite. The results revealed that the addition of B4C particles up to 10 wt% reduced the nucleation temperature (TN) and growth temperature (TG) of the primary Mg2Si phase. Moreover, the proper amount of B4C added to Al-20%Mg2Si composite has a significant effect on the microstructural alteration, mechanical, and tribological properties of the composite. The mean size of primary Mg2Si in Al-Mg2Si composite was 47 μm, in which with the addition of 5 wt% B4C, the particle size decreased to 33 μm. The highest UTS (217 MPa) and El% (7%) was achieved in Al-20%Mg2Si-5%B4C hybrid composite. The cast Al-20%Mg2Si composite revealed the brittle mode of fracture with some cleavage characterization, in which with the addition of 5%B4C, the fracture mode altered to a more ductile fracture. The wear results revealed that the Al-20%Mg2Si-5%B4C hybrid composite has the highest wear resistance with the lowest wear rate (0.46 mm3/Km) and friction coefficient (µ = 0.52) under 20 N applied load compared to other fabricated composites with mild abrasion as the governed wear mechanism.

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“…The deposits from EN processes have high corrosion resistance, lower wear surface. They have a noticeable lower amount of porosity, which results in outstanding wearing off and the abrasion resistance of the thickness quotient (S. S. Sharma et al, 2016;Sánchez et al, 2010).…”

Section: Introductionmentioning

confidence: 99%