The effects of Mg addition on the microstructure and mechanical properties of thixoformed Al–5%Si–Cu alloys

Salleh, Mohd Shukor; Omar, Mohd Zaidi; Syarif, Junaidi

doi:10.1016/j.jallcom.2014.09.152

Cited by 69 publications

(21 citation statements)

References 34 publications

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“…Manakala, kuprum pula berupaya meningkatkan kekuatan dan kebolehmesinan di samping mengurangkan kemuluran dan rintangan kakisan aloi aluminium. Selain itu, unsur magnesium ditambah untuk meningkatkan kekuatan dan memperbaiki kebolehkerasan terikan aloi aluminium (Ghazali 2006;Ammar et al 2008;Abdul Latif et al 2014;Salleh et al 2015).…”

Section: Pengenalanunclassified

“…Kajian mengenai proses penghasilan mikrostruktur berbentuk bukan dendrit dengan menggunakan kaedah tuangan cerun penyejuk juga hanya tertumpu kepada aloi aluminium tuang tersebut. Oleh itu, keupayaan sebenar proses ini masih tidak dapat digunakan dan terdapat keperluan untuk mencari komposisi kimia aloi aluminium yang sesuai untuk proses pembentukan-tikso (Paes and Zoqui 2005;Patel et al 2008;Salleh et al 2015). Dalam laporan ini, kajian mengenai keupayaan aloi aluminium Al-4.8Si-2.8Cu-0.5Mg terhadap proses pembentukan logam separa pepejal dibincangkan.…”

Section: Pengenalanunclassified

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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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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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“…Further, additional Mg will result in a primary-phase grain refinement [30]. Salleh et al [31] indicated that the fracture behavior of the thixoformed alloys was improved after a T6 heat treatment, with significantly higher ductility. The initial microstructure of the developed 356.0v alloy, obtained from vertical electromagnetic continuous casting billets 70 mm in diameter, is shown in Fig.…”

Section: Alloy Developmentmentioning

confidence: 99%

Alloy development and reheating process exploration of Al–Si casting alloys with globular grains for thixoforming

Wang

Zhang²,

Phillion

et al. 2016

J. Mater. Res.

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A novel two-stage reheating process with new alloy design has been developed to improve the microstructure morphology of semi-solid Al-Si casting aluminum alloy for thixoforming. The process consists of first reheating the material to the liquidus temperature, holding for 5 minutes, and then lowering to the predetermined two-stage reheating temperature between 843 -863 K and holding for 10 minutes. The experimentally-obtained grain diameter, roundness, and the amount of liquid trapped within the solid phase were characterized, along with the microstructure obtained using the traditional feedstock reheating process. The Wilcox test (with α=0.05) was then applied to statistically analyze the measured differences in the microstructures obtained using the two different processing routes. It was found that a refined near-spherical structure with uniform globule size, higher sphericity, lower coarsening rate constant, and less entrapped liquid was obtained via the new two-stage reheating process in comparison with the microstructure obtained using the traditional feedstock reheating process.

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“…Yeom et al [19] improved the mechanical properties of the alloy by adding Mg and Al 2 Ca. Salleh, et al [20] studied the semi-solid microstructure and mechanical properties of Al-5Si-Cu with different Mg content. Researchers believe that Mg has a significant improvement in the mechanical properties of Al-Si alloys [21,22].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mg addition on microstructure and mechanical properties of Al-Si-Cu-Fe alloy with squeeze casting

Jiang

et al. 2019

Mater. Res. Express

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In this work, the Al-10Si-2.5Cu-0.8Fe alloy was used as the base alloy to squeeze casting with different content Mg-10Al master alloy addition. The effects of microstructure and mechanical properties were investigated by XRD, OM, SEM, and tensile test analysis. The results show that with the increase of Mg addition, the morphology of eutectic Si in the alloy changes from strip to fiber and the size is obviously reduced. Al 8 Mg 3 FeSi 6 phase in the microstructure gradually grows, and the splitting effect on the matrix structure is increased. The tensile strength and elongation of the alloy increased first and then decreased with the increase of Mg content. When the Mg content is 1.38%, the tensile strength of the alloy reached a maximum of 289 MPa and the elongation is 2.24%. The hardness of the alloy gradually increases. When the Mg content is 2.51%, the hardness reaches 121.8 HV. The cleavage surface in the fracture becomes fine with the increase of Mg content, the number of dimples increases, and the fracture mode transitions from quasi-cleavage fracture to brittle fracture.

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The effects of Mg addition on the microstructure and mechanical properties of thixoformed Al–5%Si–Cu alloys

Cited by 69 publications

References 34 publications

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

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

Alloy development and reheating process exploration of Al–Si casting alloys with globular grains for thixoforming

Effect of Mg addition on microstructure and mechanical properties of Al-Si-Cu-Fe alloy with squeeze casting

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