Fabrication and characterisation of Al2O3/aluminium alloy 6061 composites fabricated by Stir casting

doi:10.1016/j.matpr.2017.02.157

Materials Today: Proceedings

Volume 4, Issue 2, Part A, 2017, Pages 2783-2792

https://doi.org/10.1016/j.matpr.2017.02.157 Get rights and content

Abstract

Aluminium alloy based metal matrix composites (AMMC) are widely used for sliding wear applications because of their excellent wear resistant properties. AMMC are fabricated using various methods like liquid state fabrication, solid state fabrication methods, etc. It was found that stir casting is an economical method to fabricate AMMC. In the present work, aluminium alloy 6061 reinforced with various percentages of Al2O3 particles (5, 10, 15 and 20 wt%) were prepared. At first the stir casting set up was prepared as per the requirement. The objectives of this research work are the fabrication and characterisation of AA 6061/ Al2O3 AMMC which was fabricated using stir casting process. The microstructures of AMMC were studied using scanning electron microscopy. Al2O3 particles were observed to refine the grains and were distributed homogeneously in the aluminium matrix. Al2O3 particles clusters were also seen in a few places.Al2O3 particles were properly bonded to the aluminium matrix. The reinforcement of Al203 particles improved the micro hardness and ultimate tensile strength of AMMC.

References (9)

S.A. Sajjadi et al.
Parizi
Materials and Design
(2012)
K. Sanjay
Mazumdar
(2010)
D.M. Skibo, D.M. Schuster, L. Jolla(1988), US Patent No. 4 786 467....
J. Hashim, L. Looney, M.S.J. Hashmi, Journal of Materials Processing Technology (1999) 92±93....

There are more references available in the full text version of this article.

Cited by (151)

Experimental tribological and mechanical behavior of aluminium alloy 6061 composites incorporated ceramic particulates using Taguchi analysis
2024, Tribology International
Aluminium metal-matrix composites are broadly employed in industries like aerospace, marine, automobile-sector, and many others, generating a broad research interest. They are preferred for their high strength and low wear rate. This research work is mainly directed towards the fabrication of two types of metal-matrix composite materials using aluminium-alloy 6061(AA6061) as the matrix material and incorporating aluminium oxide (Al₂O₃), aluminium nitride (AlN), and silicon carbide (SiC) as a reinforcement material. AA6061 has been reinforced with Al₂O₃ and SiC particulates in AS series composites, while AA series composites, AA6061 has been reinforced with Al₂O₃ and AlN particulates. This hybrid metal composite was constructed using the stir-casting method. These hybrid composites have been investigated for their physical and mechanical characteristics, viz. density, hardness, impact strength, void content, flexural strength, and tensile strength following the ASTM standards. Tribological characteristics of these hybrid composites were performed by Pin-on-disc (POD) tribometer. Taguchi’s design of experimental technique was applied taking four factors viz. composition, sliding-velocity (SV), sliding-distance (SD), and load, and each having 4 levels. ANOVA was employed to find out meaningful parameters. SEM analysis of worn-surface was executed to find out the dominant wear mechanism. Experimental density was highest for AS42, and AA42 composites and void content were lowest for the same. Mechanical properties viz. density, hardness, impact strength, void content, flexural strength, and tensile strength were higher than the base alloy. From the response table of Taguchi analysis of AS and AA composite, the load factor significantly impacted the specific wear rate (SWR) to follow filler content (FC). It can be followed from the ANOVA table for AS composite that the load factor had a magnificent impact on the SWR. The SV and SD show no significant effect on SWR.
Exploring the potential uses of Aluminium Metal Matrix Composites (AMMCs) as alternatives to steel bar in Reinforced Concrete (RC) structures-A state of art review
2023, Journal of Building Engineering
Reinforced Concrete (RC) elements are pivotal in the construction industry, with steel bars most widely used in it. However, the production of steel bars poses challenges such as weight, corrosion and environmental impact. This study explores the potential uses of Aluminium Metal Matrix Composites (AMMCs) as an alternative to conventional steel bars, emphasizing sustainability and performance. The research investigates AMMCs properties against industry standards, revealing compelling outcomes. The AMMCs exhibited a remarkable yield stress of 869 MPa, exceeding the required 600 MPa for Fe600 bars. The AMMCs can achieve the elongation percentage of the 40.87 % which aligns with IS:1786–2008 guidelines. Furthermore, AMMCs demonstrated a Young's Modulus value of more than 200 GPa, which satisfies the minimum value as prescribed in IS:456–2000 guidelines. These outcomes demonstrate that AMMCs can be used as a reinforcement bar in RC elements as alternative to steel bar, as its properties align with standards and regulations while promoting a sustainable future. By using advanced materials such as AMMCs in the construction sector can reduce its carbon footprint, adhere to environmental regulations and lead in a more environmentally friendly era of construction practises.
Influence of the Mg content on the microstructure and mechanical properties of Al-xMg-2.0Si-0.6Mn alloy
2023, Journal of Materials Research and Technology
In this study, the effect of Mg content on the microstructure and mechanical properties of the Al-xMg-2.0Si-0.6Mn alloy was investigated. The study aimed to investigate the optimal addition of Mg elements to improve the comprehensive performance of the alloy. The microstructure, phase composition and fracture morphology of the alloy were determined through OM, SEM, TEM and XRD analysis. With the increase of Mg content, the number of strengthening phases increases, which improves the comprehensive properties of the alloy. When the Mg content in an alloy exceeds 5%, the solubility of the Mg₂Si phase in the matrix is reduced, and the development of the coarse Mg₂Si phase limits the alloy's elongation. The performance is excellent when the content of Mg is 5%. The alloy has maximum tensile strength, yield strength, and elongation of 227.22 MPa, 136.55 MPa, and 7.24%, respectively. Furthermore, we discovered that the point-like Mg₂Si phase exists in the alloy and coexists with the point-like α-Al₁₅(Fe, Mn)₃Si₂. TEM investigation revealed the incoherent relationship between the two point-like phases, and the phase diagram suggested α-Al₁₅(Fe, Mn)₃Si₂ as a probable substrate for the nucleation of the Mg₂Si phase.
An enhanced Dendritic Neural Algorithm to predict the wear behavior of alumina coated silver reinforced copper nanocomposites
2023, Alexandria Engineering Journal
Due to the lack of analytical solutions for the wear rates prediction of nanocomposites, we present a modified machine learning method named Dendritic Neural (DN) to predict the wear performance of copper-alumina (Cu-Al₂O₃) nanocomposites that have large applicability in electronics. This modification aims at determining the optimal weights of DN since they have largest influence on its performance. To achieve this improvement a new meta-heuristic technique named Artificial Hummingbird Algorithm (AHA) was used. The modified model was applied to predict the wear rates and coefficient of friction of Cu-Al₂O₃ nanocomposites that was developed in this study. Electroless coating of Al₂O₃ nanoparticles with silver (Ag) was performed to improve the wettability followed by ball milling and compaction to consolidate the composites. The microstructural, mechanical and wear properties of the produced composites with different Al₂O₃ content were characterized. The wear rates and coefficient of friction were evaluated using sliding wear test at different load and speeds. The developed model using AHA algorithm showed excellent predictability of the wear rate and coefficient of friction for Cu-Al₂O₃ nanocomposites with reinforcement content up to 10%.
Experimental analysis of Al composites toughened by aluminium oxide and graphite using stir casting progression
2023, Materials Today: Proceedings
Aluminum-Alloy Reinforced among ceramic particles Composites (AMCs) or Hybrid Metal Composites (HMC) is a class of compact, higher production compositions which are aluminum-centric. Due to their superior physcio-mechanical characteristics when compared to their base Al alloy. Aluminum MMCs are extensively utilized in a mixed range of applications. The present work is aimed to study the mechanical properties of composite Al alloy (A356/LM25) reinforced with micro-sized ceramic particles (Al₂O₃ and graphite) by means of stir casting process. Different sets of composites with invariable 1% weight fraction of graphite and 1, 3, 5 % weight of ceramic particle size of 100–200 μm (Al₂O₃) and un-reinforced A356/ LM25 samples are prepared by variable speeds of stirring likely be 200 rpm, 300 rpm and 400 rpm sustaining constant temperature. Tensile strength and hardness tests were performed to study the optimum composition.
Review on synthesis of AA 6061 metal matrix alloy using stir casting method
2023, Materials Today: Proceedings
The composites of aluminum AA6061 alloy have superior performance and material characteristics in comparison with base alloy. Present study gives a detailed review on the AA 6061 metal matrix composite (MMC) manufactured with conventional stir casting method, where the process parameters used and characterization method used have been deliberated upon. On review it has been observed that reinforcements like Al₂O₃, B₄C, SiC and TiC have been most commonly used for manufacturing of AA 6061 metal matrix nano composite (MMNC). In current trend other suitable reinforcements like hybrid, inorganic, nanomaterials and organic reinforcements are being looked upon. The AA 6061 hybrid composites consists of two or more reinforcements and reported comparatively superior properties as compared to single component composite. There is huge scope for research on AA 6061 nanocomposite that has much higher strength and wear resistance and useful for aerospace and defence applications.

View all citing articles on Scopus

View full text

Materials Today: Proceedings

Fabrication and characterisation of Al2O3/aluminium alloy 6061 composites fabricated by Stir casting

Abstract

Materials and Design

Mazumdar