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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.
Czasopismo
Rocznik
Tom
Strony
71--75
Opis fizyczny
Bibliogr. 20 poz., rys., tab., wykr.
Twórcy
autor
- Istanbul University, Metallurgical and Materials Engineering, Istanbul, Turkey
autor
- Istanbul University, Metallurgical and Materials Engineering, Istanbul, Turkey
autor
- Atatürk University, Department of Metallurgical and Materials Science Engineering, Istanbul, Turkey
autor
- Istanbul University, Metallurgical and Materials Engineering, Istanbul, Turkey
autor
- Istanbul University, Metallurgical and Materials Engineering, Istanbul, Turkey
Bibliografia
- [1] Flemings, M.C. (1991). Behavior of metal alloys in the semisolid state. Metallurgical transactions A. 22(5), 957-981.
- [2] Spencer, D.P. (1971). Rheology of Liquid Solid Mextures of Lead-tin. Doctoral dissertation, Massachusetts Inst Technology.
- [3] Spencer, D. B., Mehrabian, R. & Flemings, M. C. (1972). Rheological behavior of Sn-15 pct Pb in the crystallization range. Metallurgical Transactions. 3(7), 1925-1932.
- [4] Fan, Z. (2002). Semisolid metal processing. International materials reviews. 47(2), 49-85.
- [5] Czerwinski, F. (2006). The basics of modern semi-solid metal processing. JOM. 58(6), 17-20.
- [6] Atkinson, H.V. (2005). Modelling the semisolid processing of metallic alloys. Progress in materials science. 50(3), 341-412.
- [7] Kirkwood, D. H., Suéry, M., Kapranos, P., Atkinson, H.V., Young, K.P. (2010). Semi-solid processing of alloys (Vol. 124). Berlin: Springer.
- [8] Kiuchi, M. & Kopp, R. (2002). Mushy/semi-solid metal forming technology–Present and Future. CIRP Annals-Manufacturing Technology. 51(2), 653-670.
- [9] Hirt, G., Kopp, R. (Eds.). (2009). Thixoforming: Semi-solid Metal Processing. John Wiley & Sons.
- [10] Jiang, J., Wang, Y., Xiao, G. & Nie, X. (2016). Comparison of microstructural evolution of 7075 aluminum alloy fabricated by SIMA and RAP. Journal of Materials Processing Technology. 238, 361-372.
- [11] Binesh, B. & Aghaie-Khafri, M. (2016). Phase evolution and mechanical behavior of the semi-solid SIMA processed 7075 aluminum alloy. Metals. 6(3), 42.
- [12] Bolouri, A., Shahmiri, M. & Kang, C.G. (2012). Coarsening of equiaxed microstructure in the semisolid state of aluminum 7075 alloy through SIMA processing. Journal of Materials Science. 47(8), 3544-3553.
- [13] Turkeli, A. & Akbas, N. (1996). Formation of non-dendritic structure in 7075 wrought aluminum alloy by SIMA process and effect of heat treatment. In Proceedings of the Fourth International Conference on Semi-solid Processing of Alloys and Composites, Sheffield, UK (pp. 71-74).
- [14] Mohammadi, H., Ketabchi, M. & Kalaki, A. (2011). Microstructure evolution of semi-solid 7075 aluminum alloy during reheating process. Journal of materials engineering and performance. 20(7), 1256-1263.
- [15] Rikhtegar, F. & Ketabchi, M. (2010). Investigation of mechanical properties of 7075 Al alloy formed by forward thixoextrusion process. Materials & Design. 31(8), 3943-3948.
- [16] Tan, E., Tarakcilar, A.R. & Dispinar, D. (2012). Effect of melt quality and quenching temperature on the mechanical properties of SIMA 2024 and 7075. In Advanced Materials Research. 445, 171-176. Trans Tech Publications.
- [17] Tan, E., Tarakcilar, A. R. & Dispinar, D. (2012). Correlation between Melt Quality and Fatigue Properties of 2024, 6063 and 7075. Supplemental Proceedings: Materials Properties. Characterization, and Modeling. 2, 479-485.
- [18] Weibull, W. (1951). A statistical distribution function of wide applicability, Journal of Applied Mechanics. September, 293-297.
- [19] Kirtay, S. & Dispinar, D. (2012). Effect of ranking selection on the Weibull modulus estimation. Gazi University Journal of Science. 25(1), 175-187.
- [20] Özdeş, H., Erdeniz, İ., Erzi, E., Dişpinar, D. (2014). Near-Net-Shape Processing of 2024 Aluminium Alloy by SIMA Method. In Shape Casting: 5th International Symposium 2014 (pp. 233-240). Springer, Cham.
Uwagi
PL
Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-0515a4d7-8b9b-4d71-a379-bda6e8bf4354