Effects of in-situ γ-Al2O3 particles and heat treatment on the microstructure and mechanical properties of A356 aluminium alloy

Li, Qinglin; Li, Fubin; Xia, Tiandong; Lan, Yaqi; Jian, Yisheng; Fan, Tie

doi:10.1016/j.jallcom.2014.11.212

Cited by 26 publications

(7 citation statements)

References 35 publications

(39 reference statements)

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“…16 LM25 alloy with different content levels (0.2, 0.4 0.6, and 0.8 wt%) of γ-Al 2 O 3 particles, were subjected to T4 heat treatment to observe significant changes in morphology of eutectic Si with fine structure. 17 LM25 alloy was subjected to T6 heat treatment with electromagnetic induction and obtained a maximum hardness of 85.5BHN, which implies a considerable improvement (39.8%) in hardness along with wear resistance (33.3%). 18 LM25 reinforced with varied combinations (3, 6, 9, and 12 wt%) of MgO particles, were subjected to heat treatment at different temperatures (200 ℃, 300 ℃, and 400 ℃) and obtained maximum hardness at 400 ℃ with 12 wt% of MgO.…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on mechanical and tribological properties of aluminum metal matrix composites

Sam

Radhika

Sai

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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LM25 aluminum alloy reinforced with 10 wt% of TiB2, WC, and ZrO2 were squeeze cast to investigate the effect of T6 heat treatment on tribo-mechanical properties. Among all, WC-reinforced composite achieved superior mechanical properties at the aging time of 8 h. Microstructural examination performed on all composites and alloy concluded that the presence of WC in T6 LM25 caused reduction of α-Al dendrite size, exhibiting superior properties for this composite. X-ray diffraction analysis conducted on alloy and WC-reinforced superior composite revealed formations of phases, which improved their mechanical properties. Energy-dispersive X-ray spectroscopy analysis quantified the actual intensity of WC presence in the superior composite along with its other constituents. Response surface methodology model developed for wear test of the superior composite involves parametric range like applied load (10–50 N), sliding velocity (1–4 m/s), and sliding distance (500–2500 m). Analysis of variance along with regression analysis proved that, statistical analytical model developed good relationship between the actual wear rate and process parameters. Response surface plots represented the linearly increasing wear trend with respect to load and sliding distance. Wear rate dropped initially and raised later on along with velocity. Scanning electron microscopy exhibited the surface deformation prevailing on the composite surface at high load.

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Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on mechanical and tribological properties of aluminum metal matrix composites

Sam

Radhika

Sai

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Liu et al [22] proved that the facets of coarse Si particles are mostly the {111} Si planes. According to the reference [24], the <112> directions of {111} Si planes are the preferred growth orientation of Si particles. Furthermore, the {111} close-packed surfaces show the lowest surface energy and high atomic binding [25].…”

Section: Resultsmentioning

confidence: 99%

Effects of Solidification Pressure and Heat Treatment on the Microstructure and Micro-Hardness of AlSi9CuMg Alloy

et al. 2019

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The effect of high pressure (135 MPa) and the following heat treatment on the microstructure and micro-hardness of the squeezing cast AlSi9CuMg alloy is investigated, using optical microscopy (OM), Vickers tester, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results indicate that the application of high pressure can increase under-cooling and the cooling rate during solidification and cause the refinement of the microstructure. The enhanced melt flow resulting from high pressure can also break the dendrite to form the spherical and elliptical primary α (Al) grains during the early stage of solidification. The winter-sweet flower-shaped primary α (Al) phases can also be formed through plastic deformation caused by the flow of the partially solidified melt. The ageing treatment results showed that a maximum (peak) micro-hardness value was obtained for each of the three ageing temperatures at different ageing times, and the highest peak value was achieved at 175 °C for 480 min. The micro-hardness change of the sample under different ageing processes was attributed to the variation of type, density, and size of the precipitates.

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“…To achieve better feeding and fluidity, various master alloys are added to the alloy in the liquid state. While strontium is generally preferred for Si modification and eutectic temperature depletion [26], Ti is added for grain refinement [27,28]. Mohanty and Gruzleski [29]] characterized that the grain refinement mechanism of the three Ti master alloys (Al-Ti, Al-5Ti-B and AI-B) in the A356 alloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ti addition holding time on casting quality and mechanical properties of A356 alloy

Gurtaran

Uludağ

2020

SN Appl. Sci.

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Bifilms are casting defects that occur due to the incorporation of surface oxide film into the melt. Thus, they act as a crack in the liquid. Once they remain in the structure, they decrease mechanical properties owing to their negative effect on porosity formation. One of the most fundamental problems to be avoided in this frame is the reduction of the bifilms or the cleaning of the liquid metal to prevent the porosity formation. In this study, A356 (Al-7Si-0.3 Mg) alloy was used. AlTi5B1 master alloy was added as a grain refiner. The effect of Ti on casting quality and mechanical properties changes by holding time was evaluated. The results were examined statistically by Weibull analysis. It was found that the presence of bifilms can be reduced as holding time increases after adding Ti. The tensile properties were increased as the holding time increased. Additionally, the optimum holding time may be 40 min after Ti addition for high casting quality and good mechanical properties.

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Effects of in-situ γ-Al2O3 particles and heat treatment on the microstructure and mechanical properties of A356 aluminium alloy

Cited by 26 publications

References 35 publications

Effect of heat treatment on mechanical and tribological properties of aluminum metal matrix composites

Effect of heat treatment on mechanical and tribological properties of aluminum metal matrix composites

Effects of Solidification Pressure and Heat Treatment on the Microstructure and Micro-Hardness of AlSi9CuMg Alloy

Effect of Ti addition holding time on casting quality and mechanical properties of A356 alloy

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