Experimental Evaluation of the Coefficient of Thermal Expansion of Chilled Aluminum Alloy-Borosilicate Glass (P) Composite

Hiremath, Anupama; Hemanth, Joel

doi:10.26872/jmes.2017.8.12.447

Cited by 6 publications

(3 citation statements)

References 6 publications

(6 reference statements)

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“…At higher reinforcements multidirectional thermal stresses induce the movement of dislocations in different directions.12wt.% of zircon appears cleavage mode of fracture is observed [38]. Rapid solidification creates nuclei and results in fine grain structure [39]. It is observed that chill end composite specimens show better bonding between matrix and reinforcement and which is responsible for the better properties but at 12 wt.…”

Section: Before Wearmentioning

confidence: 99%

Dry Sliding Friction and Wear Behavior of LM13/Zircon/Carbon (HMMC’s): An Experimental, Statistical and Artificial Neural Network Approach

Ravitej¹,

Mohan²,

Ananthaprasad³

2022

Tribol. Ind.

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Dual reinforcement in composite materials leads to the betterment of properties. In the present research, zircon is added from a range of 0 wt. % to 12 wt. % in the steps of 3 wt. % by maintaining constant 3 wt. % graphite powder in addition to the aluminum alloy (LM13) matrix. Reinforcements are preheated at 250°C to remove moisture content and are dispersed in the molten aluminum alloy (LM13) by stir casting process where copper chills are kept at one end of the mold to enable unidirectional solidification. Wear properties are evaluated using pin on disc experiment. Design of the experiment (DOE) is done using Taguchi's (L25) orthogonal array to assess the effect of (a) applied load (b) sliding speed (c) track radius/sliding distance (d) zircon content on wear loss/volume loss, coefficient of friction (COF)and wear rate. It is observed that wear rate and wear loss are proportional to the applied load, sliding speed and track radius COF is inversely proportional to the same. Wear rate decreases with the addition of zircon up to 9 wt. % and then increases at 12 wt. %. Statistical analysis is done using Minitab software where SN ratio, probability, ANOVA, and a regression model are analyzed. Obtained experimental wear properties are validated using artificial neural networks (ANN) by training the neurons where good agreement is obtained (R 2 = 0.98). Present research encapsulates the effect of different wear parameters like applied load, sliding speed, and sliding distance on the wear rate of LM13/zircon/C (hybrid metal matrix composites), and experimental wear results are correlated with artificial neural network (ANN) by training the algorithm.

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Section: Before Wearmentioning

confidence: 99%

Dry Sliding Friction and Wear Behavior of LM13/Zircon/Carbon (HMMC’s): An Experimental, Statistical and Artificial Neural Network Approach

Ravitej¹,

Mohan²,

Ananthaprasad³

2022

Tribol. Ind.

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“…The selection of casting as the processing method invariably calls for setting up a rapid abstraction of heat from the melt to ensure directional solidification resulting in a refined grain structure and quality castings [36,37]. End chills are used to promote the directional solidification of the casting, thus enabling the production of defect-free AMCs [38,39]. Sunil Kumar et al studied the effect of copper end-chill on the fatigue characteristics of A356/hematite AMCs.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of the Thermal Properties of LM13- Quartz- Fly-Ash Hybrid Composites

Murthy,

Ambekar,

Hiremath

2024

J. Compos. Sci.

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In the present work, a metal–matrix composite was casted using the LM13 aluminum alloy, which is most widely used for casting automotive components. Such applications require materials to withstand high operating temperatures and perform reliably without compromising their properties. In this regard, particulate-reinforced composites have gained widespread adaptability. The particulate reinforcements used comprise of one of the widely available industrial by-products. which is fly ash, along with the abundantly available quartz. Hybrid composites are fabricated through the economical liquid route that is widely used in mass production. Though there are numerous published research articles investigating the mechanical properties of metal–matrix composites, very few investigated the thermal properties of the composites. In the present work, thermal properties such as thermal conductivity and thermal diffusivity of cast hybrid composites were evaluated. The particulate reinforcements were added in varied weight percentages to the molten LM13 alloy and were dispersed uniformly using a power-driven stirrer. The melt with the dispersed particulate reinforcements was then poured into a thoroughly dried sand mold, and the melt was allowed to solidify. The quality of the castings was ascertained through density evaluation followed by a microstructural examination. It was found that the composites with only the fly ash particles as a reinforcement were less dense in comparison to the composites cast with the quartz particulate reinforcement. However, the hybrid composite, with both particulate reinforcements were dense. The microstructure revealed a refined grain structure. The thermal diffusivity and thermal conductivity values were lower for the composites cast with only the fly ash reinforcement. On the other hand, the composites cast with only quartz as the particulate reinforcement exhibited higher thermal diffusivity and thermal conductivity. The specific heat capacity was found to be lower for the fly ash-reinforced composites and higher for the quartz-reinforced composites in comparison to the LM13 base matrix alloy. However, the highest value of thermal diffusivity and thermal conductivity were reported for the hybrid composites with a 10 wt.% inclusion of both fly ash and quartz particulate reinforcements.

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“…One novel method of obtaining sound castings is by the incorporation of end chills which are strategically placed within the mold cavity. Chills possessing volumetric heat capacities are known to promote directional solidification of the melt within the mold cavity ensuring a defect-free, highstrength composite [8]. Thus the present paper investigates the effect of incorporating different end chill materials with varied volumetric heat capacities placed strategically within the mold cavity.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of the Chill Casting Method for the Fabrication of LM-25 Aluminum Alloy-Borosilicate Glass (p) Composites

Hiremath

Hemanth²

2017

KEM

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The paper investigates the novelty of application of end chills in fabricating Aluminum alloy metal matrix composites. An effort has also been made to evaluate the effect of chill material on the soundness of the castings obtained. The required composites were prepared using LM-25 Aluminum alloy as matrix material in which different weight percent of Borosilicate glass particles were added ranging from 3 wt.% to 12 wt.%. The variation in weight percent was brought about in steps of 3%. The fabrication of the composites was carried out in sand molds by incorporating two metallic (copper and Steel) and two non-metallic (Graphite and Silicon carbide) end chills. The specimens for strength and hardness tests were prepared as per ASTM standards and the specimens were drawn from near chill-end as well as from farther away from chill end. The microstructure of the specimens reveal a refined grain structure proving the sound quality of the castings. The result analysis also leads to the conclusion that metallic chills are more beneficial as compared to non-metallic chills for obtaining a good quality composites. Copper chill with a high volumetric heat capacity proved to be the best chill material amongst the others.

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Experimental Evaluation of the Coefficient of Thermal Expansion of Chilled Aluminum Alloy-Borosilicate Glass (P) Composite

Cited by 6 publications

References 6 publications

Dry Sliding Friction and Wear Behavior of LM13/Zircon/Carbon (HMMC’s): An Experimental, Statistical and Artificial Neural Network Approach

Dry Sliding Friction and Wear Behavior of LM13/Zircon/Carbon (HMMC’s): An Experimental, Statistical and Artificial Neural Network Approach

An Investigation of the Thermal Properties of LM13- Quartz- Fly-Ash Hybrid Composites

Experimental Evaluation of the Chill Casting Method for the Fabrication of LM-25 Aluminum Alloy-Borosilicate Glass (p) Composites

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