Challenges in Producing Reliable Tensile Properties by SIMA 7075

• Autorzy: Erzi E. , Gursoy O. , Yüksel Ç.O.K. , Kirtay S. , Dispinar D.

Identyfikatory

DOI

10.24425/123604

• Języki publikacji: EN

Abstrakty

EN

Aluminium alloys are one of the preferred materials especially for land and air transportation because of their high strength and low-density properties. Although production using casting method is economical yet it has some disadvantages. Shrinkage which is occurred due to the density difference between the solid and liquid metal is prevented by feeders which need to be calculated. Liquid metal should be transferred to the mould without any turbulence. As a result, sprues are needed to be designed precisely. On the other hand, aluminium alloys can also be shaped by forging at semi-solid temperatures. There are some advantages compared to the traditional forging methods of improving die life due to the lower tonnage values. In this study, semi-solid produced 7075 aluminium alloy die filling capabilities were investigated. To achieve semisolid structure strain induced melt activated method (SIMA) was used. The desired structure was achieved at 635°C and 30 minutes of duration of heat treatment. After determining the optimum parameters, metallographic analysis, density calculations, porosity distribution and tensile tests were carried out. It was found that the reproducibility of SIMA produced 7075 alloy was quite low. A proper tensile test result was achieved only 7 of the total 15 tests and the mean value was 386 MPa. The main reason for this scattered in mechanical properties could be the chemical composition of the alloy and the rapid solidification of the liquid eutectic phases. It is important to define the best fitting process parameters and controlling them precisely will be the most important factors for future studies.

Słowa kluczowe

EN

AA7075; mechanical properties; product development; semi-solid processing; thixocasting; SIMA

PL

AA7075; właściwości mechaniczne; rozwój produktu; przetwarzanie; SIMA

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2018
• Tom: Vol. 18, iss. 3
• Strony: 71--75
• Opis fizyczny: Bibliogr. 20 poz., rys., tab., wykr.

Twórcy

autor

Erzi E.

• Istanbul University, Metallurgical and Materials Engineering, Istanbul, Turkey

autor

Gursoy O.

• Istanbul University, Metallurgical and Materials Engineering, Istanbul, Turkey

autor

Yüksel Ç.O.K.

• Atatürk University, Department of Metallurgical and Materials Science Engineering, Istanbul, Turkey

autor

Kirtay S.

• Istanbul University, Metallurgical and Materials Engineering, Istanbul, Turkey

autor

Dispinar D.

• Istanbul University, Metallurgical and Materials Engineering, Istanbul, Turkey

Bibliografia

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).