Influence of Lanthanum on Solidification, Microstructure, and Mechanical Properties of Eutectic Al-Si Piston Alloy

Ahmad, Roslee; Asmael, Mohammed

doi:10.1007/s11665-016-2139-8

Cited by 37 publications

(14 citation statements)

References 51 publications

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“…The effect of the FSP on the performance of the LM28 alloy was evaluated using a numerical index that depends on the metallurgical qualities of the alloy: quality index (Q) [13]. Rather than tensile and elongation alone, the quality index combines the strength and ductility and presents a description of the true tensile properties of the cast material and samples [21]. The as cast alloys quality index was increased to 300.8 MPa, 315.4 MPa, 290.3 MPa, and 266.2 MPa, due to porosity elimination as well as refinement of grains/particles [13].…”

Section: Resultsmentioning

confidence: 99%

Influence of Friction Stir Process on Microstructure and Tensile Properties of LM28 Hypereutectic Al-Si Alloy

Abdulmalik

Ahmad²

2018

IJIE

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This paper reports an investigation of the influence of friction stir processing (FSP) on the microstructure modification, tensile properties and hardness of as cast hypereutectic LM28 aluminium silicon (Al-Si) alloy, aimed to decrease Silicon particles size, porosity, and enhancing tensile properties. Intense plastic deformation foisted by FSP resulted in a remarkable breaking up of the coarse eutectic and primary silicon particles into smaller ones, and closure of porosity. The area sizes of the fragmented Si particles decreased from 155.1 μm² to around 49.4 μm², aspect ratio of about 2.86 in the as cast condition decreased to around 1.63 after FSP. Porosity was also drastically reduced from 94 µm ECD, in the as cast condition to as low as 7.1 µm ECD. The strength and ductility of the alloy increased simultaneously after FSP. The increase in the tensile strength and ductility values after FSP, as compare to the as cast alloy was around 1.56, and 4.38 times respectively. The LM28 FS-processed alloy displayed an increase in quality index of around 1.97 times higher, than that of the as-cast alloy. The hardness of the alloy increased from 64.6 HV for the as-cast alloy to about 85.74 HV after FSP. Enhancement in all the properties was largely related to the pronounced changes of the shape, area size and distribution of the silicon particles along with the reduction of porosity FSP.

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Section: Resultsmentioning

confidence: 99%

Influence of Friction Stir Process on Microstructure and Tensile Properties of LM28 Hypereutectic Al-Si Alloy

Abdulmalik

Ahmad²

2018

IJIE

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“…e microstructure consists of Al as the primary phase in the hypereutectic and Si as the primary phase in the eutectic and hypoeutectic Al-Si alloy. During solidification, grain refinement takes place, which leads to improved mechanical and tribological properties of the Al-Si binary alloy [6,7]. Due to their extensive properties, these alloys are used as a substitute for cast iron in the automotive industry.…”

Section: Introductionmentioning

confidence: 99%

Effect of Load on the Tribological Properties of Eutectic Al-Si Reinforced n-Al₂O₃ under Dry Sliding Conditions

Srivyas

Charoo

2020

Advances in Tribology

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Advanced composites are the materials of the new generation. Hence, the focus of the study is to determine the tribological properties of the eutectic Al-Si alloy reinforced with (2, 4, 6, 8, and10 wt. %) of n-Al2O3 against chrome-plated steel ball under dry sliding conditions. The novelty of this work is the fabrication of the composite sample with this elemental composition, which is not done before. Spark plasma sintering (SPS) nonconventional fabrication method is used to fabricate advanced composite samples. Friction coefficient (COF) and wear rate of the composite samples were studied under high load, varying from 50 N to 300 N, using the ball-on-disc tribometer configuration, with other parameters such as stroke, frequency, sliding distance, and sliding velocity remaining constant at 2 mm, 30 Hz, 120 meter, and 0.120 m/s, respectively. Reduction in wear volume for the advanced composite was reported in the range 15.45–44.58% compared to the base alloy (eutectic Al-Si alloy). An increase in friction coefficient was reported in the range 28.80–35.65% compared to the base matrix alloy material. It was also reported that the wear rate increases and the friction coefficient of the composite sample decreases with an increase in load for the tribo-pair. It was observed that an increase in the wt. % of reinforcement influences the friction and wear behavior of the composite. Wear mechanism at high load was characterized by plastic deformation, adhesion, delamination, and abrasion wear. For pre- and postcharacterization of surface and worn tracks, scanning electron microscopy (SEM) electron dispersion spectroscopy (EDS), 3D surface profilometer, and optical microscopy were used. This work aimed to investigate the influence of load on the tribological properties of Al-Si eutectic reinforced n-Al2O3 under dry sliding conditions. Its main objective was to provide a new contribution to the tribological behavior of these composites fabricated using the nonconventional spark plasma sintering method.

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“…The sole addition of Bi is reported to be favorable in obtaining the modified eutectic phase [10]; nevertheless, the addition of Bi along with Sr exhibited the poisoning effect and reduced the modification effectiveness to some extent [11]. Moreover, some other studies [12][13][14][15] claimed that the inclusion of La significantly modifies the microstructure, mechanical, and corrosion resistance properties of Al-Si alloys. Ahmad R [16] investigated the modification role Ce addition; whereas, Jiang et al [17] evaluated the collective effect of rare earth (La and Ce) elements and declared that a suitable amount of rare earth mixture alters almost all microstructure features and improves mechanical properties considerably.…”

Section: Introductionmentioning

confidence: 99%

Concurrent effects of various B additions on grain refinement, Fe intermetallics morphologies, and ductility evolution of Al-7.5Si-0.55 Mg (A357) cast alloy

et al. 2020

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Simultaneous effects of boron (B) additions on grain refinement, morphological changes in Fe-intermetallic compounds, and consequent variations in mechanical responses of the cast Al-7.50Si-0.55 Mg (A357) alloys are evaluated in this research work. The contents B are varied from 0.002 to 0.40 wt. % and subsequent changes in the grain size and Feintermetallics morphologies are assessed through polarized light images, optical micrography, and scanning electron microscopy. A small addition of B (0.04 wt. %) yields identical refinement result (620 µm) as noted for commercial grain refiner Al-5Ti-1B (642 µm); whereas, the higher amount (0.40 wt. % of B) reduces the grain size up to 44% (360 µm). In as-cast state, the structure of the π-Fe phase is transmuted from plate/needle-type to Chinese-script particles for increased quantities (0.10 ~ 0.40 wt. %) of B. Contrarily, the heat-treatment (T6) causes the depletion of Mg and B from the π-Fe phase Chinese-script morphologies and disintegrates them by creating segregated regions of Fe particles. These agglomerated areas of Fe particles act as stress concentration points during tensile loading and considerably decrease the ductility values from 6.7 to 1.8%. Therefore, it implies that great care must be taken while developing B containing grain refiners.

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Influence of Lanthanum on Solidification, Microstructure, and Mechanical Properties of Eutectic Al-Si Piston Alloy

Cited by 37 publications

References 51 publications

Influence of Friction Stir Process on Microstructure and Tensile Properties of LM28 Hypereutectic Al-Si Alloy

Influence of Friction Stir Process on Microstructure and Tensile Properties of LM28 Hypereutectic Al-Si Alloy

Effect of Load on the Tribological Properties of Eutectic Al-Si Reinforced n-Al₂O₃ under Dry Sliding Conditions

Concurrent effects of various B additions on grain refinement, Fe intermetallics morphologies, and ductility evolution of Al-7.5Si-0.55 Mg (A357) cast alloy

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Influence of Lanthanum on Solidification, Microstructure, and Mechanical Properties of Eutectic Al-Si Piston Alloy

Cited by 37 publications

References 51 publications

Influence of Friction Stir Process on Microstructure and Tensile Properties of LM28 Hypereutectic Al-Si Alloy

Influence of Friction Stir Process on Microstructure and Tensile Properties of LM28 Hypereutectic Al-Si Alloy

Effect of Load on the Tribological Properties of Eutectic Al-Si Reinforced n-Al2O3 under Dry Sliding Conditions

Concurrent effects of various B additions on grain refinement, Fe intermetallics morphologies, and ductility evolution of Al-7.5Si-0.55 Mg (A357) cast alloy

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Effect of Load on the Tribological Properties of Eutectic Al-Si Reinforced n-Al₂O₃ under Dry Sliding Conditions