Optimization and Prediction of Tribological Behaviour of Al-Fe-Si Alloy-Based Nanograin-Refined Composites Using Taguchi with Response Surface Methodology

Balaji, S.; Maniarasan, P.; Alagarsamy, S. V.; Alswieleh, Abdullah M.; Mohanavel, V.; Ravichandran, M.; Jeon, Byong-Hun; Allasi, Haiter Lenin

doi:https://doi.org/10.1155/2022/9733264

Journal of Nanomaterials

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Abstract Introduction Materials and Methods Results and Discussion Conclusions Data Availability Conflicts of Interest Acknowledgments References Copyright Related Articles

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Green Nanometal Oxides for Environmental and Biomedical Applications

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Research Article | Open Access

Volume 2022 | Article ID 9733264 | https://doi.org/10.1155/2022/9733264

Optimization and Prediction of Tribological Behaviour of Al-Fe-Si Alloy-Based Nanograin-Refined Composites Using Taguchi with Response Surface Methodology

S. Balaji,¹P. Maniarasan,¹S. V. Alagarsamy,²Abdullah M. Alswieleh,³V. Mohanavel,^4,5M. Ravichandran,^5,6Byong-Hun Jeon,⁷and Haiter Lenin Allasi⁸

Academic Editor: Hiwa M. Ahmed

Received17 Feb 2022

Revised30 Mar 2022

Accepted04 Apr 2022

Published25 May 2022

Abstract

Aluminium matrix composites (AMCs) are broadly used to change the monolithic materials in aviation, automotive, and defense industries owing to their superior characteristics such as specific strength with light weight, greater hardness, good wear resistance, and better thermal properties. This novel work was aimed at estimating the specific wear rate (SWR) of zirconium dioxide- (ZrO₂-) filled AA8011 (Al-Fe-Si alloy) matrix composites. A Taguchi method and response surface methodology (RSM) were used to find out the optimum range of control parameters on SWR of proposed composites. The stir casting technique was used to fabricate the composite specimens with varying proportions (5, 10, and 15 wt.%) of ZrO₂ particle addition. The wear tests were performed as per L27 orthogonal design by using a pin-on-disk apparatus under dry conditions. For this test, four control parameters such as wt.% of ZrO₂, load, disc velocity, and sliding distance each at three levels were selected. Based on the experimental results, 15 wt.% of ZrO₂, 29.43 N of load, 0.94 m/s of disc velocity, and 1000 m of sliding distance provide the minimum SWR of the developed composite sample. ANOVA result revealed that the load (49.04%) was the primary dominant factor for affecting the SWR, followed by wt.% of ZrO₂ content (29.24%), respectively. Moreover, scanning electron microscopy (SEM) analysis was performed to study the wear mechanism of worn-out surface of the composite test specimens.

1. Introduction

In the past few decades, aluminium and its alloys are essential materials for fabrication of high recital parts in engineering applications like aerospace, automotive, and defense industries due to their excellent characteristics like specific strength, light weight, high stiffness, good elastic modulus, and better thermal characteristics [1]. Among the many Al series alloys, Al-Fe-Si alloy has emerging material for various engineering structural applications owing to its unique characteristics such as high strength and hardness. However, these alloys have obtained very poor tribological properties. Hence, these alloys are made with self or hard ceramic particulates such as ZrO₂ [2], TiC [3], TiB₂ [4], Al₂O₃ [5], B₄C [6, 7], ZnO [8], Si₃N₄ [9], and Gr [10] to improve the tribological properties. The development of Al-based composites increases widespread in recent days because of it providing more wear resistance. Stir casting, powder metallurgy, infiltration, compo casting, etc., are commonly employed to develop the AMCs [11]. Among them, stir casting technique is most preferable due to their merits like simple and flexible; more economic and mass production can be achieved [12]. The limitation of the stir casting method is to obtain sufficient wetting of reinforcement particles by molten alloy and to get a homogeneous distribution of the particles and also to reduce the porosity. However, these are prohibited by proper utilization of casting process variables. They [13] fabricated AA7075 composites reinforced with TiO₂ particulates by liquid casting technique, and they reported that the properties of the developed AMCs drastically enhanced due to even allocation of reinforcement. They [14] conducted the wear test of Al-ZrO₂ composites under dry conditions and concluded that the wear resistance, improved gradually with an increasing ZrO₂ content. Generally, a variety of factors like load, disc velocity, lubricating medium, and sliding distance are controlling the wear rate of fabricated components. Therefore, selection of optimal parameters is more essential during the wear test. Optimization techniques like the Taguchi method and response surface method are most suitable for prediction of optimum wear control parameter level. The Taguchi method is one of the primary statistical technique which is applied in various areas such as design optimization, parameter selection, and prediction of output responses. It provides a simple, efficient, and systematic approach to optimize the wear control parameters. They [15] optimized the wear parameters of AMCs (356/B₄C) using Taguchi technique. They observed that load was a predominant factor trailed by sliding distance with contributions of 35% and 25%, respectively. This work [16] conducted the wear test for AA6062 using a pin-on-disk apparatus under dry conditions. The optimum level of parameters was determined by RSM coupled with desirability analysis. The SEM image of the worn surface reveals that abrasive wear mechanism was occurring. This work [17] optimized the wear control factors such as wt.% of reinforcement, load, sliding distance, and speed on wear resistance of AA7150-TiC nanocomposites by employing the Taguchi method. They [18] presented the wear performance of SiC-Gr-filled AMCs, and they reported that a raise in load rises the wear of the fabricated composites. The author [19] considered the wear rate of nanosize of SiC particle-filled AMCs proposed by two-step stir casting route and reported that the dispersion of SiC_n (60.15%) content was the strongest impact factor, trailed by sliding distance (35.33%), respectively. The worn surface analysis shows that the formation of the oxide layers resists the metal removal from the pin surface, thus resulting in decreasing the wear. They [20] analyzed the tribological performances of ZrO₂-reinforced Al7068 MMCs produced through liquid metallurgy route. They stated that 12 wt.% ZrO₂ composition addition drastically improves the tribological performances of the matrix alloy. They [21] explored the wear behavior of in situ AA8011-ZrB₂ MMCs using Taguchi-Grey analysis, and they found that the load and sliding velocity are the most decisive factors among the others. This work [22] predicted the SWR of Al7075 composites incorporated with B₄C (8 wt.%) and fly ash (2 wt.%). The RSM was accomplished to create an empirical model of SWR in terms of various input factors. The worn-out surface shows that the deep plowing grooves and fine debris exist which ensure the presence of powling mechanism. They [23] studied the wear behavior of LM25 matrix composites reinforced with varying proportions (3, 6, 9, 12, and 15 wt.%) of ZrO₂ particles. They reported that the WR decreases with an increase in the wt.% of ZrO₂ content.

From the detailed literatures, we had observed that the most research work has been studied on AA8011 with different reinforcements such as B₄C, Al₂O₃, SiC, TiC, TiB₂, Si₃N₄, and graphite, but none of them attempted for AA8011 with ZrO₂ as reinforcement via stir casting route. Hence, the present work was aimed at analyzing the SWR of ZrO₂-filled AA8011 matrix composites developed through stir casting route. An optimization technique such as the Taguchi method and RSM has been applied to find out the optimum conditions of factors on SWR of the fabricated composites.

2. Materials and Methods

In the current study, the matrix constituent was chosen as AA8011 (Al-Fe-Si alloy) received from Coimbatore Metal Mart, Coimbatore, India. Recently, AA8011-containing Al-Fe-Si alloy has emerging material in modern engineering applications such as aerospace, automotive, and defense industries where enhanced strength, hardness, and good wear resistance materials are enormously required. Table 1 provided the weight fraction of chemical elements present in the matrix alloy. Similarly, the reinforcement was used as zirconia (ZrO₂) particulates with a particle size of 10 μm received from LOBA Chemie, Mumbai, India. It has a density of 5.68 g/cm³, hardness of 1350 kg/mm², Young’s modulus of 250 GPa, and thermal conductivity of 2.7 W/m.K, respectively. The stir casting technique adopted the production of AA8011 matrix composites by adding different weight fractions (5 wt.%, 10 wt.%, and 15 wt.%) of ZrO₂ particles. The layout of current investigation is illustrated in Figure 1.

Primarily, the required amount of AA8011 rod was stored into the crucible, and it was placed in the electric furnace. The furnace temperature was maintained at 750°C, till the entire alloy was melted. At the same time, the different weight percentages such as 5 wt.%, 10 wt.%, and 15 wt.% of ZrO₂ particles were preheated at 300°C [12] to promote the dry condition and proper wettability with the molten metal. After that, the ZrO₂ particles were slowly fed into the slurry of molten alloy. Meanwhile, the composite slurry was stirred at a speed of 300 rpm about 10 min [13]. Then, the slurry was poured into the mould, and it was permitted to solidify at normal air temperature. After solidification, the composites were taken out from the mould, and the required test specimens were prepared.

After getting the composite specimen, the wear test was executed according to ASTM G-99 standard by TR-20 DUCOM pin-on-disk tribometer. The wear test pins’ size of was prepared by wire cut EDM. During the wear test, the test pins were pushed on the EN-31 steel counter disc with 60 HR_C hardness. To achieve the clean surface, the test specimen and the counter disc were polished using fine emery sheet and also cleaned by the acetone solution. Usually, there are many control parameters involved to conduct the wear test. Based on the earlier studies [13], we have considered four parameters with three levels such as wt.% of ZrO₂ (A), load (B), disc velocity (C), and sliding distance (D), respectively. Based on the parameters and its levels (Table 2), Taguchi L₂₇ orthogonal design was formulated to perform the wear tests. After the tests, the SWR of tested composite specimens is determined by using where is the mass loss of test pin (g), is the density of the fabricated composite (g/mm³), is the load (N), and is the sliding distance (m). The estimated SWR for each experiment is provided in Table 3.

3. Optimization Methodologies

3.1. Taguchi Method

The Taguchi method is a reliable statistical approach which can be employed to find out the permissible range of parameter conditions with minimum experimental trials performed. The intend of this method is used to make high-quality product with minimum cost [24]. For applying this method, suitable orthogonal array design is formulated based on the quantity of input factors and its levels concerned. Notably, three arithmetic S/N ratio equations can be used to determine the response such as smaller is better, nominal is best, and larger is better, respectively [25]. Here, the objective of this study is to identify the optimal control factors on SWR while dry sliding process of AA8011-ZrO₂ composites. To compute the S/N ratio for the SWR, smaller the better arithmetic S/N ratio equation can be used and it was provided in

where is the no. of trials and is the response, where and . The calculated S/N ratios for the SWR are given in Table 3.

3.2. Response Surface Method

RSM is a powerful and advanced mathematical tool. The main goal of this method is to determine the impact of independent factors on the dependent responses clearly represented by theoretically developed model [26]. In this study, we had employed to predict the SWR and how it is dominated by the independent control factors including wt.% ZrO₂ (A), load (B), disc velocity (C), and sliding distance (D), respectively, by using the “design expert version 12” software, to create an empirical model of SWR in terms of control parameters. To explicate the mathematical appropriate relation between the input factors and SWR, the second-order polynomial regression equation was proposed.

Here, is constant, is the linear terms, is the quadratic terms, is the interaction terms, and and are the levels of input parameters, respectively.

4. Results and Discussion

4.1. S/N Ratio Analysis

Figures 2 and 3 reveals the main effect plots for mean and S/N ratio on the SWR with each level of control parameters, namely, wt.% of ZrO₂, load, disc velocity, and sliding distance. In Figure 2, it is seen that the SWR is gradually decreased with an increasing trend of ZrO₂ content. The reason is that the inclusion of ceramic (ZrO₂) particulates improved the hardness of the fabricated composites, which result in reduced the SWR. From Figure 3, it can be proved that the higher S/N ratio is nearer to the optimum conditions. Hence, the less SWR is produced at the optimum level parameters A₃B₃C₁D₁, represented as wt.% of ZrO₂ at 15 wt.%, load at 29.43 N, disc velocity of 0.94 m/s, and sliding distance at 1000 m. Tables 4 and 5 depicted the response table for means and S/N ratio of SWR. It was revealed that the order of impact parameters on response is represented as rank 1, 2,…, etc. Normally, the rank 1 is assigned as most significant parameter followed by others. Based on Tables 4 and 5, it can be understood that the load has been identified as rank 1 which is more influencing parameter on SWR, subsequently by wt.% of ZrO₂, sliding distance, and disc velocity, respectively. The SWR is directly proportional to the load applied, which is obeyed by Archard’s law. Hence, the SWR increases with increasing applied load due to more contact pressure between the surfaces. The similar observations were previously reported [27].

4.2. Analysis of Variance (ANOVA)

ANOVA is a collection of statistical approach used to decide the noteworthy parameters on the responses under the group of process parameters [28]. The purpose of the current investigation is to identify the impact of control parameters including wt.% ZrO₂ (A), load (B), disc velocity (C), and sliding distance (D) on SWR during dry sliding wear test. ANOVA result of SWR is presented in Table 6. In order to find the noteworthy effect of parameters on SWR, the -ratio and value (Table 6) are considered at 95% CI and 5% significant level. The -value of 21.27 indicates that the developed empirical model is significant, as seen in Table 5. Similarly, the developed model terms are significant which ensured by the value (<0.0001). It has also been found that the terms A, B, D, AB, and B² are considered as the important (most dominant) factors on the SWR. Usually, the is used to determine the fitness of the empirical model. For current analysis, value is 0.9613 and adjusted value is 0.9161 which shows the greater significance of the model. Hence, there is also a well concurrence between the predicted and the adjusted value.

The mathematical relations for the SWR in terms of coded and actual factors are given in

Figure 4 displays the predicted and actual values of SWR. It clearly understood that the predicted values are reasonably closer to the experimental values. Figure 5 shows the probability vs. externally studentized residual plot of the SWR. It can be ensured that the residuals are evenly located along a straight line, which confirms that the developed model is fitted. The externally studentized residual with experiment order is shown in Figure 6. From the plot, the experiment number 7 provided the high residual value among the others.

4.3. Interaction Effect of Parameters on SWR

Figure 7 illustrates the 2D surface plots for SWR with related to the control parameters. The main purpose of surface plot is used to reveal the interaction effect of parameters on the response. Figures 7(a)–7(c) illustrate the interaction of reinforcement on SWR of developed composites with respect to other parameters like load (B), disc velocity (C), and sliding distance (D). It can be revealed that the SWR gradually increases with increasing the weight.% of ZrO₂ particles. By considering the load (B), SWR is less for AA8011-15 wt.% of ZrO₂ composite with maximum load condition. The middle level of disc velocity (C) produces low SWR for 15 wt.% of ZrO₂ composite. By considering the sliding distance (D), the higher SWR is produced at higher levels of sliding distance (2000 m) with low weight.% of ZrO₂ content. Figures 7(d) and 7(e) show the interaction of load (B) with disc velocity (C) and sliding distance (D) on SWR. SWR increases with an increasing trend of disc velocity at low level of load (9.81 N). However, the low SWR of is obtained at 29.43 N of load with the middle level of disc velocity. From Figure 7(e), it can be observed that the high SWR of is produced at a maximum sliding distance of 2000 m with initial load of 9.81 N. The effects of disc velocity (C) and sliding distance (D) on SWR is shown in Figure 7(f). It can be clearly revealed that the SWR steadily increases with an increase in the sliding distance at middle level of disc velocity 1.88 m/s. But, the less SWR is attained at 0.94 m/s disc velocity and 1000 m sliding distance, respectively.

(a)

(b)

(c)

(d)

(e)

(f)

4.4. Worn Surface Morphology

The SEM morphology of the worn-out surface of developed AA8011-ZrO₂ composite specimens tested at various conditions of control parameters is illustrated in Figures 8(a) and 8(b). From the figure, the presence of mechanisms in the worn surfaces was exactly noticed.

(a)

(b)

Figure 8(a) depicts the worn-out surface of the initial test conditions including 5 wt.% of ZrO₂-filled composite at a load of 9.81 N, disc velocity of 0.94 m/s, and sliding distance of 1000 m, respectively. It shows the presence of deep ploughing grooves, delamination, some pits, and macrocrack on the worn-out surface. The asperities of the counter disc generated deep ploughing grooves while sliding, resulting in the formation of ridges. The dislodged particles existence in some region due to the repetitive sliding action and also some debris removed from the ridges. Due to the removal of reinforcement (ZrO₂) particles, some pits are formed in the worn-out surface. This causes the abrasive mechanism involved. The worn-out surface of the optimal test conditions of 15 wt.% of ZrO₂-dispersed composite at a load of 29.43 N, disc velocity of 0.94 m/s, and sliding distance of 1000 m is shown in Figure 8(b). It obviously revealed the presence of the smooth surface as well as fine grooves on the worn-out surface. The reason is behind that is that the dispersion of higher amount of ZrO₂ (15 wt.%) particles improves the surface hardness among the other composites, thus will reduce the SWR. Due to higher load (29.43 N) conditions, the microcrack exists in a few regions on the surface. However, the mechanical mixed layer (MML) is formed due to transfer of materials between the counterpart and pin surface which causes reduced the SWR.

5. Conclusions

This work investigated the effects of control parameters on SWR of zirconia- (ZrO₂-) filled AA8011 composites under dry sliding conditions. The given observations were obtained in this study: (i)The various weight fractions (5, 10, and 15 wt.%) of ZrO₂ particle were incorporated with AA8011 matrix composites through stir casting route. A pin-on-disk machine was used to conduct the wear tests under dry conditions(ii)A Taguchi technique was applied to identify the optimal control parameters on SWR of proposed composites. Based on the main effect plot, the less SWR is obtained at 15 wt.% of ZrO₂, 29.43 N of load, 0.94 m/s of disc velocity, and 1000 m of sliding distance(iii)RSM-based ANOVA result revealed that the load has been considered as the more influencing parameter on SWR, followed by wt.% of ZrO₂ content with percentage contributions of 49% and 29.24%, respectively(iv)SWR drastically minimizes when there is an increasing trend of ZrO₂ particles within the matrix alloy. The reason is behind that is that the inclusions of ceramic content improved the hardness, thus reducing the SWR of the developed composite(v)The SEM micrograph of the worn-out surface reveals the presence of deep grooves, plugs, and cracks on the surface of the initial parametric conditions. However, at optimal parametric conditions, the fine grooves and smooth surface are formed due to higher amount (15 wt.%) of ZrO₂ addition that creates the MML layer, thus reducing the SWR(vi)In the future, other optimization techniques such as fuzzy logic and artificial neural network and machine learning approaches can be used to predict the SWR of the developed composites

Data Availability

The data used to support the findings of this study are included within the article. Further data or information is available from the corresponding author upon request.

Conflicts of Interest

The authors declare that there are no conflicts of interest regarding the publication of this paper.

Acknowledgments

The authors appreciate the support from the Wollo University, Kombolcha Institute of Technology, Ethiopia, for the research and preparation of the manuscript. The authors would like to acknowledge the Researchers Supporting Project number (RSP-2021/238), King Saud University, Riyadh, Saudi Arabia.

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Copyright © 2022 S. Balaji et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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