Novel molding technique for ECAP process and effects on hardness of AA7075

Kaya, Hasan; Uçar, Mehmet; Cengiz, A. Tevfik; Samur, R.; Özyürek, Dursun; ÇALIŞKAN, Ahmet

doi:10.5755/j01.mech.20.1.4207

Cited by 21 publications

(10 citation statements)

References 32 publications

(33 reference statements)

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“…At the end of the process, since corrosion sensitivity of the alloy increases, T73 heat treatment is developed to increase corrosion resistances of these types of alloys. By means of this heat treatment process the corrosion resistance of alloys exhibits significant increase but strength of the alloy decreases by 10-15% [8,9]. In order to ensure resistance and improve the corrosion characteristics of aluminum alloys to optimum levels, retrogression, RRA and forming preliminary-precipitation at HTPP heat treatments are applied.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of Different Heat Treatments on Wear Behavior of AA7075 Alloy

Kalyon

Özyürek

2017

Acta Phys. Pol. A

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In this study, wear behavior of AA7075 alloy applied different ageing heat treatments is examined. During each ageing heat treatment, the relevant samples are processed with solid solution at 485• C for 2 h. After the quenching process, ageing processes were performed. The T6 heat treatment is applied at 120• C for 24 h. Along the re-ageing heat treatment process, samples undergone the T6 process is taken into the solid solution at 120• C once more and aged at the given temperature for 24 h. In the high temperature heat treatment process, the samples are pre-precipitated at 445• C for 30 min and then taken to ageing process at 120• C for 24 h. Wear tests are carried out at 1 m/s constant sliding speed and under 20 N load along four different sliding distances (300-1200 m). The amount of precipitation observed from the structure exhibits difference at the second phase with respect to applied ageing heat treatment. Finest precipitation particle is observed with T6 heat treatment and the coarse precipitation is with the high temperature heat treatment. Furthermore, a relationship is determined between dimension of the second phase precipitation and hardness values.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of Different Heat Treatments on Wear Behavior of AA7075 Alloy

Kalyon

Özyürek

2017

Acta Phys. Pol. A

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“…Günümüzde çok farklı ve yeni APD teknikleri üzerine birçok çalışma yapılmaktadır. Bunlar içerisinde en popüler olanları; ECAP (Eş kanallı açısal presleme) [7,8], HPT (Yüksek basınç burulması) [9], ARB (Biriktirmeli hadde yapıştırması) [10]. Boruların APD işleminde kullanılan teknikler ise şunlardır; TCP (Tüp kanal presleme) , TCAP (Tüp kanal açısal presleme) [11], HPTT (Yüksek basınçlı boru burma) [12], PTCAP (Paralel tüp kanal açısal presleme) [13], t-HPS (Tüp yüksek basınçlı kesme) [14], RTES (Tekrarlayan tüp genişleme ve daralma) [15], TCEC (Tüp tekrarlı ektrüzyon-basma) [16], TCEE (Tüp tekrarlı ektrüzyon-genişleme) [17], ASB (Biriktirmeli çevirme yapıştırma) [18].…”

Section: Introductionunclassified

Boruların Çift Geçişli Paralel Tüp Kanal Açısal Presleme (DP- PTCAP) Yöntemi ile Aşırı Plastik Deformasyon Analizi

Taşdemir

2020

Fırat Üniversitesi Mühendislik Bilimleri Dergisi

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Öz: Aşırı plastik deformasyon (APD), nano yapılı ve ultra ince taneli malzemeler elde edilmesi amacı ile kullanılan bir yöntemdir. Tüp şeklindeki malzemelerin aşırı plastik deformasyonunda kullanılan birçok yöntem vardır. Bu yöntemlerden biri de paralel tüp kanal açısal presleme (PTCAP) yöntemidir. Bu çalışmada, boru şeklindeki parçaların deformasyonu çift geçişli paralel tüp kanal açısal presleme (DP-PTCAP) metodu kullanılarak araştırılmıştır. Analizlerde, 5 farklı kanal açısı, 4 farklı kesit genişleme oranı ve 4 farklı boyutsuz uzunluk kullanılmıştır. Bu parametrelerin elde edilen tüp (boru) şeklindeki parçaların gerilme, birim şekil değişimi ve şekillendirme kuvvetine etkileri sonlu elemanlar yöntemi ile analiz edilmiştir. Çalışmada AA6061 malzeme kullanılmıştır. Analizler sonucunda, kanal açısının artması ile efektif birim şekil değişimi, şekillendirme kuvveti ve malzemede oluşan gerilmenin azaldığı görülmüştür. Çift geçişli kalıplarla elde edilen malzemelerin birim şekil değişiminin tek geçişli kalıplara nazaran daha yüksek olduğu belirlenmiştir. Yapılan çalışma sonucu analizlerden elde edilen birim şekil değişimine bakarak çift geçişli kalıplar ile elde edilen malzemelerin tane yapısının tek geçişli kalıplara nazaran daha ince taneli olduğu söylenebilir.

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“…By the effect of the high stress, ultrafine-grained (UFG) materials can be produced that these materials show high strength to deformation with orientation, precipitation, and dislocations on the internal structure [1]. The most well-known methods of the SPD can be listed as equal-channel angular pressing (ECAP) [2,3], high-pressure torsion (HPT) [4], repetitive corrugation and straightening (RCS) [5], accumulative roll bonding (ARB) [6], cyclic extrusion compression (CEC) [7], multidirectional forging (MDF) [8], tubular channel angular pressing (TCAP) or tube channel pressing (TCP) [9,10], and twist extrusion (TE) [11]. When the methods are extensively investigated, it is seen that all of these are applied to bulk, plate, wire, and tubular materials.…”

Section: Introductionmentioning

confidence: 99%

A new severe plastic deformation method: thin-walled open channel angular pressing (TWO-CAP)

Şahbaz

Kaya

Kentli

2019

Int J Adv Manuf Technol

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In this study, a novel severe plastic deformation method, named as thin-walled open channel angular pressing (TWO-CAP), was developed and applied to AZ31 magnesium alloy beams in U-type cross-sectional shape. First of all, the principles of the method with all parameters were determined, and the analytical model of the system was generated, and then the study was supported with the numerical analysis. Then, a proper experimental setup was established by considering theoretic outputs. After that, AZ31 magnesium alloy specimens were machined from bulk material in U-type shape as to fit the die channel, and then these specimens were annealed and pressed along the TWO-CAP die. Following the experimental studies, the specimens were tested in order to define the changes in mechanical and microstructural properties. In this stage, the tension test and hardness test were applied to determine the mechanical properties, while optical microscope, scanning electron microscope, energy dispersive spectrometry, X-ray diffraction, and transmission electron microscope analyses were applied to see the changes in microstructure. As a result, an improvement on strength, hardness, and toughness was observed depending on the changes on the microstructure and grain refinement due to the large plastic deformation.

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Novel molding technique for ECAP process and effects on hardness of AA7075

Cited by 21 publications

References 32 publications

Investigation of the Effect of Different Heat Treatments on Wear Behavior of AA7075 Alloy

Investigation of the Effect of Different Heat Treatments on Wear Behavior of AA7075 Alloy

Boruların Çift Geçişli Paralel Tüp Kanal Açısal Presleme (DP- PTCAP) Yöntemi ile Aşırı Plastik Deformasyon Analizi

A new severe plastic deformation method: thin-walled open channel angular pressing (TWO-CAP)

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