Effects of heat treatments on AA6061 aluminum alloy deformed by cross-channel extrusion

Chou, Chih-Yueh; Hsu, Che Wei; Lee, Sheng Long; Wang, Kuan Wen; Lin, Jiaping

doi:10.1016/j.jmatprotec.2007.11.115

Cited by 15 publications

(5 citation statements)

References 14 publications

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“…AA6061 alloy is low-strength age-hardening alloy in Al series and it has better corrosion resistance compared to other Al series alloys. 16 FSP also has a stronger influence on corrosion behavior. Studies by Sinhmar et al 17 and Satyanarayana et al 18 revealed that corrosion rate of FSPed Al alloys decreased due to the presence of small equiaxed grain structure and uniform distribution of fine precipitate.…”

Section: Introductionmentioning

confidence: 96%

Effect of microstructure and precipitate formation on mechanical and corrosion behavior of friction stir processed AA6061 alloy using different cooling media

Satyanarayana

Kumar

Thapliyal

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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The present work studies the effect of microstructure and precipitate formation on mechanical and corrosion characteristics of friction stir processed AA6061 alloy using different cooling technologies (cryogenic and water cooling). The results revealed that recrystallized fine grains formed in all friction stir processing samples (grain size within a range of 2–6 µm) as a result of dynamic recovery and recrystallization, while samples processed in cooling-assisted friction stir processing resulted in better grain refinement in the stir zone than in air-cooled friction stir processing. Three kinds of precipitates (Fe-based needle-shaped precipitates, Si-based round-shaped precipitates, and chain of small round-shaped Si-based precipitates) were identified in base material and friction stir processing samples. Compared to air-cooled friction stir processing, in cooling-assisted friction stir processing, the hardness and tensile strength increased but remained lower than for the base alloy due to the presence of high density Fe-based needle-shaped precipitates. The ductility after friction stir processing greatly improved due to thermal softening and dissolution of precipitates. The corrosion results demonstrated that the corrosion resistance greatly enhanced after friction stir processing due to uniform distribution of grain structure and discontinuous chain of small round-shaped Si-based precipitates in stir zone. Moreover, cooling-assisted friction stir processing resulted in improved corrosion resistance compared to air-cooled friction stir processing due to the formation of fine precipitates.

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Section: Introductionmentioning

confidence: 96%

Effect of microstructure and precipitate formation on mechanical and corrosion behavior of friction stir processed AA6061 alloy using different cooling media

Satyanarayana

Kumar

Thapliyal

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…The quenching process was performed at 530ºC for 2 hrs, after that quenched by water to room temperature (≈ 25 ºC ). Subsequently, the aging process was carried out at 175 ºC for various of time (2,4,6,8,10) hrs, after that cooled by air to room temperature. Fig.1 shows the profile of the quenching and the aging process.…”

Section: G Heat Treatment Processmentioning

confidence: 99%

“…A commercial AA6061 aluminum alloy is one of the Al, Mg, Si(Cu) system alloys that can be significantly hardened by a proper heat treatment. Because of its medium strength, excellent corrosion resistance, and weldability, the AA6061 alloy has been widely used as structural material for construction, transportation and sports [6]. (Lipeng et.al.2015) has been treated aluminium AA6022 by various aging temperature (80, 100, 130 and 170 °C) and various holding times (2,3,4 hrs).…”

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confidence: 99%

Heat Treatment for an Recycling Aluminum Aa6061 Using Milling Process at Various Holding Aging Time

Mahdi¹,

Mustapa²,

Latif³

et al. 2016

IJET

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Abstract-In this investigation, AA6061 milled particle size was fabricated by milling machine and later compacted by hydraulic press in room temperature. Seven specimens were chosen for the heat treatment process. For reference, one specimen was treated solely by the quenching and another one was treated by the aging only, On top of that, there were five specimens were subjected to various holding times during the aging. The experimental results show that the maximum value of compression strength was 300.47 MPa for the specimen subjected to quenching and aging of holding time 4 hours and the maximum value for microhardness was 100.44 Hv for the same specimen. While the density value was decreased with increasing the holding time. The maximum value of the density was 2.61 g/cm 3 for the specimen (Quenching only). X-ray inspection was detected some of chemical compound were created such as (Al86Fe14) and (Cr13Ni5Si2). Keyword-Aging process, Milling process, Powder metallurgy, Recycling aluminium, AA6061.I. INTRODUCTION 6xxx Al-Mg-Si alloys have been widely used in automotive body panels as main substitute materials for weight reduction [1]. The industry has been focused on the materials as recycling, specifically the materials have been used more and more costly. These recycling offers several advantages which include their relatively lower production costs, isotropic properties and the possibility of using conventional shaping methods (e.g. Extrusion, forging, and rolling) for component manufacturing [2]. Among the various physical and chemical methods, a mechanical ball-mill technique is recognized as a simple and cost-effective method to produce fine and homogeneous powders [3]. During the past 20 years, high energy ball milling has extensively been utilized as a versatile method to produce a variety of advanced compound powders. The main difference between high energy milling by the planetary ball mill, Spex, Attritor mill, etc. and conventional milling is that the former applies much larger doses of energy to particles over time [4]. This large input energy makes high energy mills capable of producing materials with special properties that could not be synthesized by other methods. The milling process produces considerable strain hardening in the Al powder, which is directly reflected on the final properties of the composite powders, therefore, it is needed to treat with heat treatment process [5]. A commercial AA6061 aluminum alloy is one of the Al, Mg, Si(Cu) system alloys that can be significantly hardened by a proper heat treatment. Because of its medium strength, excellent corrosion resistance, and weldability, the AA6061 alloy has been widely used as structural material for construction, transportation and sports [6]. (Lipeng et.al.2015) has been treated aluminium AA6022 by various aging temperature (80, 100, 130 and 170 °C) and various holding times (2,3,4 hrs). He has concluded that the 100 °C by 3hrs is the best attempt. Other than that, there were researchers had been published some other research ...

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“…Alüminyum alaşımlarında çökelti sertleşmesi prosesi üç aşamada gerçekleşmektedir. Bu aşamalar çözeltiye alma, su verme ve yaşlandırma adımlarını içermektedir [12].…”

Section: Introductionunclassified

Al-10Si-xMg Alaşımının CALPHAD Metodolojisi ile Termodinamik Karakterizasyonu

AKYILDIZ

Öztürk²,

SİMSAR

2021

Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Özet: Alüminyum ve alaşımları düşük yoğunluk, yüksek spesifik mukavemet, korozyon dayanımı, yüksek elektriksel ve ısıl iletkenlik özelliklerinden dolayı otomotiv, havacılık ve uzay, savunma sanayilerinde yaygın olarak kullanılmaktadırlar. Genellikle malzemelerin mukavemetlerinin artırılması bakımından, alüminyum alaşımlarında ısıl işlem ve deformasyon prosesleri uygulanmaktadır. Magnezyum ve bakır alaşım elementlerinin ilavesi ile alüminyum alaşımlarında kayda değer bir mukavemet artışı sağlanabilmektedir. Malzemelerin özellikleri; malzemelerin kimyasal kompozisyonlarına, proseslerine ve mikroyapılarına bağlı olarak değişmektedir. Bu modelleme ve simülasyon çalışmasında, Al-10Si-xMg alaşımında değişen % ağırlıkça Mg oranlarının malzeme üzerindeki etkisi incelenmiş ve CALPHAD metodolojisinin kullanımı ile termodinamik analizleri gerçekleştirilmiştir. Modelleme ve simülasyon çalışmalarında Thermo-Calc yazılımı 2021a versiyonundaki TCAL7.1 alüminyum veri tabanı kullanılmıştır. Al-10Si-xMg alaşımında değişen % ağırlıkça Mg oranının liküdüs, solidüs ve Al-Si alaşımlarında görülen ötektik reaksiyon sıcaklıklarına etkisi incelenmiştir. Ayrıca ısıl işlem ile mukavemet artışı sağlayan Mg2Si çökeltilerinin oluşum sıcaklıkları ve miktarları belirlenerek Türkçe literatüre katkı sağlanması düşünülmüştür.

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Effects of heat treatments on AA6061 aluminum alloy deformed by cross-channel extrusion

Cited by 15 publications

References 14 publications

Effect of microstructure and precipitate formation on mechanical and corrosion behavior of friction stir processed AA6061 alloy using different cooling media

Effect of microstructure and precipitate formation on mechanical and corrosion behavior of friction stir processed AA6061 alloy using different cooling media

Heat Treatment for an Recycling Aluminum Aa6061 Using Milling Process at Various Holding Aging Time

Al-10Si-xMg Alaşımının CALPHAD Metodolojisi ile Termodinamik Karakterizasyonu

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