Microstructure and mechanical properties of thixoformed A319 aluminium alloy

Salleh, Mohd Shukor; Omar, Mohd Zaidi; Syarif, Junaidi; Alhawari, K. S.; Mohammed, M. N.

doi:10.1016/j.matdes.2014.07.014

Cited by 49 publications

(21 citation statements)

References 30 publications

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“…However, the concentration of Cu atoms during the early solution treatment significantly increases due to the quick dissolution of Cu‐containing phases because the solid solution strengthening caused by solute Cu atoms is higher than that of Si atoms. [ 44–46 ] After aging treatment, a large number of fine and dispersed nanosized θ′ phase and Q′ phase precipitate, which plays a role in precipitation strengthening of the alloy. The mechanical properties of α‐Al matrix increase.…”

Section: Discussionmentioning

confidence: 99%

Adjusting the Si Phase and Forming Nanoprecipitation to Improve the Mechanical Properties of Al–Si–Cu–Mg Alloy by Heat Treatment

Hao

Bian

et al. 2021

Adv Eng Mater

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To adjust the morphology of the Si phase and improve the mechanical properties of Al–Si–Cu–Mg alloy formed by semisolid squeeze casting, the effects of solution time on microstructure evolution and mechanical properties are systematically studied. Results show that spheroidization occurs in the Si phase, and the content of Cu in the matrix increases simultaneously after solution treatment at 525 °C for 1 h. As solution time increases to 8 h, the content of Cu in the matrix increases from 1.15% to 1.41% and the dislocation density decreases. After an aging treatment at 180 °C for 12 h, the β′, θ′, and Q′ phases precipitate. After heat treatment, the alloy strength value shows a “double peak” phenomenon. After a 1 h solution treatment, the tensile strength of the alloy reaches the first peak, which is mainly ascribed to the large dislocation density induced by the semisolid squeeze casting process. When the solution time is 8 h, the tensile strength of the alloy is 323 MPa and the tensile strength reaches the second peak, which is ascribed to the rounding of the Si phase and the strengthening effects of fine precipitates.

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Section: Discussionmentioning

confidence: 99%

Adjusting the Si Phase and Forming Nanoprecipitation to Improve the Mechanical Properties of Al–Si–Cu–Mg Alloy by Heat Treatment

Hao

Bian

et al. 2021

Adv Eng Mater

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“…The values of these three parameters were based on the results of the optimization study conducted by Salleh et al 6 The parameters used in this study are shown in Table 2.…”

Section: Methodsmentioning

confidence: 99%

“…2 The CS casting process is the simplest in terms of equipment and handling and is able to produce globular microstructures from the dendritic microstructure. [3][4][5] The CS casting process is 'lab friendly' because fewer items of equipment are required: 6 a furnace to melt the alloy, a CS plate for the molten alloy to flow down and a mould to collect the molten alloy where it solidifies.…”

Section: Introductionmentioning

confidence: 99%

Microstructural morphology of rheocast A319 aluminium alloy

Aziz

Omar

Sajuri

et al. 2016

Advances in Mechanical Engineering

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This article examines the evolution of the microstructure of A319 aluminium alloy as it flows along a cooling slope plate and discusses the type and influence of the intermetallic compounds thus formed. Numerous past research studies have analysed the microstructural transformation of alloys in a mould, but few researchers have investigated this phenomenon on the cooling slope plate. A change in the microstructure of the alloy from dendritic to non-dendritic is clearly obtained as the alloy moves from the impact zone to bottom zone on the cooling slope plate. It is important to clarify the mechanism of microstructural evolution through nucleation and fragmentation of the primary phase arm for fundamental understanding of research. Analysis by optical microscope and scanning electron microscope reveals the evolution of the microstructure and intermetallic compounds of A319 as it progresses along the cooling slope plate. The Vickers test was used to determine the hardness of the alloy thus produced. The results show the influence of the mould in obtaining a spheroidal microstructure; the microstructure in the bottom zone of the cooling slope plate is nearly spheroidal rather than fully spheroidal. The hardness of the alloy is enhanced when the microstructure is spheroidal and when the Mg 2 Si compound is present in the alloy.

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“…Parameter tuangan cerun penyejuk melibatkan suhu tuangan, sudut kecondongan plat dan panjang cerun penyejukan. Apabila bilet yang mengandungi mikrostruktur bukan dendrit dipanaskan sehingga suhu separa pepejalnya, mikrostruktur berbentuk sfera cenderung untuk terbentuk (Salleh et al 2014;Haga et al 2010).…”

Section: Pengenalanunclassified

Formation of Spheroidal Microstructure in Semi-solid State of Al-4.8Si-2.8Cu-0.5Mg Aluminium Alloy

Arif¹,

Omar²,

Sajuri³

2018

JKUKM

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Hasil penyelidikan mengenai pembentukan mikrostruktur berbentuk sfera dalam keadaan separa pepejal aloi aluminium Al-4.8Si-2.8Cu-0.5Mg dibentangkan dalam penulisan ini. Bahan awal aloi aluminium tersebut dihasilkan melalui proses tuangan konvensional. Mikrostruktur bahan awal terdiri daripada struktur dendrit dan antara dendrit yang halus. Mikrostruktur aloi berubah kepada bentuk bukan dendrit (bentuk roset) yang halus apabila leburan bahan awal aloi tersebut dituang ke atas plat keluli cerun penyejuk yang dicondongkan pada sudut kecondongan 60° dengan suhu tuangan 650°C dan panjang cerun penyejukan 400 mm, sebelum dibiarkan memejal di dalam acuan keluli yang dipanaskan terlebih dahulu pada suhu 150°C. Pembentukan mikrostruktur berbentuk sfera dalam matriks cecair berjaya dihasilkan apabila bilet aloi yang mengandungi mikrostruktur bukan dendrit dipanaskan semula secara pantas sehingga suhu separa pepejalnya pada 575°C dengan menggunakan sistem pemanasan secara aruhan berfrekuensi tinggi (30-80 kHz, 35 kW). Bilet aloi yang berada dalam keadaan separa pepejal berjaya dibentuk-tikso ke dalam acuan keluli yang dipanaskan terlebih dahulu dengan menggunakan mesin penekan silinder hidraulik yang membekalkan daya tekanan 20 kN dengan kelajuan maksimum 85 mm/s. Hasil daripada proses pembentukan-tikso menunjukkan ira matriks α-aluminium yang berbentuk sfera bertaburan secara seragam di samping tidak terdapat keporosan di sepanjang sampel. Proses rawatan haba T6 yang melibatkan rawatan haba larutan pada 480°C selama 8 jam, lindapkejut dalam air panas pada suhu lebih kurang 60°C dan diikuti proses penuaan pada suhu 155°C selama 4 jam dilihat menyumbang kepada taburan partikel-partikel dengan lebih sekata.

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Microstructure and mechanical properties of thixoformed A319 aluminium alloy

Cited by 49 publications

References 30 publications

Adjusting the Si Phase and Forming Nanoprecipitation to Improve the Mechanical Properties of Al–Si–Cu–Mg Alloy by Heat Treatment

Adjusting the Si Phase and Forming Nanoprecipitation to Improve the Mechanical Properties of Al–Si–Cu–Mg Alloy by Heat Treatment

Microstructural morphology of rheocast A319 aluminium alloy

Formation of Spheroidal Microstructure in Semi-solid State of Al-4.8Si-2.8Cu-0.5Mg Aluminium Alloy

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