Casting and heat treatment variables of Al–7Si–Mg alloy

Kashyap, K. T.; Murali, S.; Raman, K. S.; Murthy, K. S. S.

doi:10.1179/mst.1993.9.3.189

Cited by 138 publications

(35 citation statements)

References 8 publications

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“…The Al-Si alloys in particular are greatly known for their rapidly advancing activities in aircrafts, aerospace and automotive industries. Intensive efforts have been made to understand the modification of these alloys by adding Na, Sr or Sb [1][2][3][4]. The addition of certain elements, such as calcium, sodium, strontium, and antimony, to hypoeutectic aluminum-silicon alloys results in a finer lamellar or fibrous eutectic network [4].…”

Section: Introductionmentioning

confidence: 99%

Nanoreinforced Cast Al-Si Alloys with Al2O3, TiO2 and ZrO2 Nanoparticles

El-Mahallawi

Shash

Amer

2015

Metals

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This study presents a new concept of refining and enhancing the properties of cast aluminum alloys by adding nanoparticles. In this work, the effect of adding alumina (Al2O3), titanium dioxide (TiO2) and zirconia (ZrO2) nano-particles (40 nm) to the aluminum cast alloy A356 as a base metal matrix was investigated. Alumina, titanium dioxide and zirconia nano-powders were stirred in the A356 matrix with different fraction ratios ranging from (0%-5%) by weight at variable stirring speeds ranging from (270, 800, 1500, 2150 rpm) in both the semisolid (600 °C) and liquid (700 °C) state using a constant stirring time of one minute. The cast microstructure exhibited change of grains from dendritic to spherical shape with increasing stirring speed. The fracture surface showed the presence of nanoparticles at the interdendritic spacing of the fracture surface and was confirmed with EDX analysis of these particles. The results of the study showed that the mechanical properties (strength, elongation and hardness) for the nanoreinforced castings using Al2O3, TiO2 and ZrO2 were enhanced for the castings made in the semi-solid state (600 °C) with 2 weight% Al2O3 and 3 weight% TiO2 or ZrO2 at 1500 rpm stirring speed.

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Section: Introductionmentioning

confidence: 99%

Nanoreinforced Cast Al-Si Alloys with Al2O3, TiO2 and ZrO2 Nanoparticles

El-Mahallawi

Shash

Amer

2015

Metals

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“…6). As it has been well established (Apelian et al, 2009;Kashyap et al,1993), the eutectic Si phase in the microstructure of the Sr-modified alloy exhibits a fibrous morphology under ascast conditions. The mean equivalent diameter d of eutectic Si particles increases approximately from the rim (~0.8 μm) toward the spoke (~1.6 μm) and the hub region (~2 μm).…”

Section: Microstructural Observations Of As-cast Wheelsmentioning

confidence: 80%

Optimizing the Heat Treatment Process of Cast Aluminium Alloys

Manente¹,

Timelli²

2011

Recent Trends in Processing and Degradation of Aluminium Alloys

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“…In the early stages of aging, fine and profuse GP zones homogeneously distribute in the matrix; then, their effects on strengthening are significant. On the other hand, the metastable phases formed at the intermediate stage of aging and kept semi-coherence with the matrix are effectively resistant to the movement of dislocation; thus, have a certain strengthening effect [13]. However, these GP zones remarkably dissolve before metastable-phase formation in the precipitation sequence of the alloys.…”

Section: Isochronal Agingmentioning

confidence: 99%

Effect of Solution Treatment on Age-Hardening Behavior of Al-12Si-1Mg-1Cu Piston Alloy with Trace-Zr Addition

Kaiser

2018

jcme

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The influence of a solution treatment with a trace zirconium addition on the precipitation behavior of a cast Al-12%Si-1%Mg-1%Cu piston alloy has been reported. The alloys were prepared by controlled melting and casting. The cast alloys were given an age-hardening treatment having a sequence of homogenization, T6 solutionizing, quenching, and aging. Both the cast and solutionized samples were naturally aged for 58 days, isochronally aged for 60 minutes at different temperatures (up to 350°C), and isothermally aged at various temperatures (up to 225°C) for different periods of time (ranging from 15 to 360 minutes).The hardness values of the differently processed alloys were measured to understand the aging behavior of the alloys. Electrical resistivity changes with aging time and temperature were measured to understand the precipitation behavior of the alloys. It is observed that significant hardening takes place in the aged alloys due to the formation of GP zones as well as the formation of metastable phases. The solutionizing treatment improves the hardness because some alloying elements are re-dissolved during solution treatment to produce a solute-rich solid solution. The trace-added Zr hinders the softening due to the precipitation of Al 3 Zr, which is very stable against coarsening and the re-dissolution of precipitates. Electrical resistivity decreases due to stress relieving, the dissolution of the metastable phase, and precipitation coarsening. The resistivity of the solutionized alloys decreases more due to the higher concentration of elements in the solid solution. A microstructural study of the alloys reveals that the solution treatment improves the distribution of the silicon grains. It is also observed that the alloys attained an almost fully re-crystallized state after aging at 350°C for 90 minutes.

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Casting and heat treatment variables of Al–7Si–Mg alloy

Cited by 138 publications

References 8 publications

Nanoreinforced Cast Al-Si Alloys with Al2O3, TiO2 and ZrO2 Nanoparticles

Nanoreinforced Cast Al-Si Alloys with Al2O3, TiO2 and ZrO2 Nanoparticles

Optimizing the Heat Treatment Process of Cast Aluminium Alloys

Effect of Solution Treatment on Age-Hardening Behavior of Al-12Si-1Mg-1Cu Piston Alloy with Trace-Zr Addition

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