Determination of Remanufacturing Parameters of Al7039 Armor Alloy

Abstract

In this study, the determinability of the remanufacturing parameters of Al7039 alloy, nowadays known as armor material, are emphasized. Commercially obtained Al7039 alloy plates are melted in a casting furnace and cast into a specially prepared mold. After the mold pressure cap is closed, the samples are squeezed into the mold with a pressure of about 18 MPa. Plates were examined by cooling at different cooling rates in order to determine the proper casting process. After the homogenization heat treatment parameters which are generally applied after casting were determined, hot forging process was started. After waiting at 400 oC temperature for 15 minutes, the plates decreased from 15 mm thickness to 6 mm thickness and cooled in the air after the process. In the heat treatment process, which is another of the production processes, the samples were made available by specifying the parameters of heat treatment, solution, quenching and artificial aging. The microstructure images taken at each stage of production and the applied mechanical tests were examined and evaluated.

 

Keywords

• Al7039 alloy,casting

Al7039 Zırh Alaşımının Yeniden Üretim Parametrelerinin Belirlenmesi

Abstract

Bu çalışmada, günümüzde zırh malzemesi olarak bilinen Al7039 alaşımının, yeniden üretilebilirliği ve üretim parametrelerinin belirlenebilirliği üzerinde durulmuştur. Ticari olarak elde edilen Al7039 alaşımlı plakalar, döküm fırınında ergitilerek, özel olarak hazırlanmış kalıp içerisine dökülmüştür. Uygulanan basınç ile kalıp içerisinde sıkıştırılan numuneler, farklı soğuma hızlarında soğutularak, uygun döküm sürecinin belirlenmesi için incelenmiştir. Genellikle döküm sonrasında uygulanan homojenleştirme ısıl işlemi parametreleri belirlendikten sonra, sıcak dövme işlemine geçilmiştir. 15mm kalınlıktan 6mm kalınlığa düşürülen yeni üretim plakalar, bu işlem sonrasında çözeltiye alma ve suni yaşlandırma ısıl işlem parametrelerinin belirlenmesi ile  kullanılabilir hale getirilmiştir. Her üretim aşamasında alınan mikro yapı görüntüleri ve uygulanan mekanik testler incelenerek değerlendirilmiştir.

Keywords

• Al7039 alaşımı,döküm

References

1. Yılmaz Ş, Delİkanli E. "The Effect of Precipitation Hardening on Mechanical Properties of Aluminium Alloy AA2024", SDU Journal of Technical Sciences, 2012, 2: 13–20.
2. Rometsch PA, Zhang Y, Knight S. "Heat treatment of 7xxx series aluminium alloys - Some recent developments", Transactions of Nonferrous Metals Society of China (English Edition) 2014, 24: 2003–17. doi:10.1016/S1003-6326(14)63306-9.
3. Wolverton C. "Crystal structure and stability of complex precipitate phases in Al-Cu-Mg-(Si) and Al-Zn-Mg alloys", Acta Materialia, 2001, 49: 3129–42. doi:10.1016/S1359-6454(01)00229-4.
4. Kogtenkova OA, Mazilkin AA, Straumal BB, Abrosimova GE, Ziȩba P, Czeppe T, et al. "Phase transformations in Al-Mg-Zn alloys during high pressure torsion and subsequent heating", Journal of Materials Science, 2013, 48: 4758–65. doi:10.1007/s10853-013-7266-0.
5. Ludtka GM, Laughlin DE. "The Influence of Microstructure and Strength on the Fracture Mode and Toughness of 7XXX Series Aluminum Alloys" Metallurgical Transaction A, 1982, 13: 411–25.
6. Chayong S, Atkinson H V., Kapranos P. "Thixoforming 7075 aluminium alloys", Materials Science and Engineering A, 2005, 390: 3–12. doi:10.1016/j.msea.2004.05.004.
7. Zolotorevskiĭ VS, Belov NA, Glazoff M. "Casting aluminum alloys" Elsevier; 2007, 327-329. doi: 10.1016/b978-008045370-5.50007-9
8. Polmear IJ. "Wrought aluminium alloys", Materials Forum, 1997, 21: 1–26. doi:10.1016/B978-075066371-7/50007-4.

9. Berg LK, Gjoønnes J, Hansen V, Li XZ, Knutson-Wedel M, Waterloo G, et al. "GP-zones in Al-Zn-Mg alloys and their role in artificial aging", Acta Materialia, 2001, 49: 3443–51. doi:10.1016/S1359-6454(01)00251-8.
10. Razooqi RN, Abtan NS, Mitab MM, Yusuf SE. "Effect of Fast Isothermal and Solution ( T6 ) Heat Treatments on A319 Alloy properties produced by Squeeze Casting Method" 2013, 7: 274–84.
11. Kai W, Baiqing X, Yongan Z, Guojun W, Xiwu L, Zhihui L, et al. "Microstructure Evolution of a High Zinc Containing Al-Zn-Mg-Cu Alloy during Homogenization" Rare Metal Materials and Engineering, 2017, 46: 928–34. doi:10.1016/S1875-5372(17)30124-8.
12. Garrett RP, Lin J, Dean TA. "An investigation of the effects of solution heat treatment on mechanical properties for AA 6xxx alloys: Experimentation and modelling", International Journal of Plasticity, 2005, 21: 1640–57. doi:10.1016/j.ijplas.2004.11.002.
13. ZOU X liang, YAN H, CHEN X hui. "Evolution of second phases and mechanical properties of 7075 Al alloy processed by solution heat treatment", Transactions of Nonferrous Metals Society of China (English Edition), 2017, 27: 2146–55. doi:10.1016/S1003-6326(17)60240-1.