Effects of initial microstructure on the earring of aluminium alloys cartridge case

  • Ljubica M. Radovic Militry Technical Institute, Serbia
  • Jelena Marinkovic Military Technical Institute, Serbia
  • Milorad Stanic Sloboda Company Cacak, Serbia
Keywords: cartridge case, impact extrusion, earring, EN AW-5754 aluminium alloy


Defects obtained during impact extrusion of EN AW-5754 aluminium alloy during cartridge case production were investigated. In cartridge cases produced from the one metallurgical heat pronounced tendency to earing after impact extrusion observed/appeared. On the other hand the earing in cartridge cases from the other heat was not observed. Presence of earing is due to local difference in materials flow during extrusion. This behaviour is atriduted to dfference in second phase particle distribution in used preforms (slugs).


Impact Extrusion versus Other Processes, Link , accessed March 2019.

S.H. Kim, S.W. Chung, S. Padmanaban: J Mat Process Tech, 180 (2006) 185–192.


HU Cheng-liang, MENG Li-fen, ZHAO Zhen, GU Bing, CAI Bing: Trans Nonferrous Met Soc China, 22 (2012) 48−53.


Xiang-Ming Cheng, Texture, microstructure and formability of aluminum alloys, University of Kentucky, 2000.

S. Hazraa, D. Williamsa, R. Roya, R. Aylmoreb, A. Smith: J Mat Process Technol, 211(9) (2011) 1516-1526.


Plastic Deformation of Metals and Related Properties, Link

K. Delikanli, The effect of the earring parameters on earring for aluminium alloys, J Yekarum (2014) 16-19.


Development program for 30mm aluminum alloy cartridge case for close-air-support gun system, Technical report AFATL-TR-71-23, Eglin Air Force Base, Florida, 1971.

T. Radetić, M. Popović, E. Romhanji: Mater. Charact. 65 (2012) 16-27.


L. F. Mondolfo, Aluminium Alloys: Structure and Properties, Boston, Butterworths,1976.

Lj. Radović, Deformaciono ponašanje i karakteristike loma Al-Mg legura u svetlu međuzavisnosti sastav-tehnologija-struktura, FTN Čačak, Univerzitet u Kragujevcu, 2013.

J.R. Davis, Aluminum and Aluminum Alloys in Alloying: Understanding the Basics, Ed. J.R. Davis Davis & Associates, ASM International, Metals Park, Ohio (2001) 351-416.

O. Engler, K. Kuhnke, J. Hasenclever: Journal of Alloys and Compounds 728 (2017) 669-681.


Lj. Radović, M. Nikačević: Sci Tech Rev VTI, 58 (2) (2008) 14-19.


E. Romhanji, M. Popovic, S. Stanojević: J. Nondestructr Eval, 29 (2010) 43–48.


W. Wen, Y. Zhao, J.G. Morris: Mat Sci Eng, A 392 (2005) 136–144.


Z. Chen, Second phase particle distribution and its effect on the formability of aluminum alloys in Computational Methods and Experiments in Material Characterization II, Eds.: C.A. Brebbia and A.A. Mammoli, eISBN 978-1-84564-212-9, WIT Press 2005, 53-62.

S. V. Kailas: Prec Indian Acad Sci (Engg Sci), 3 (4) (1980) 275-296.

T Balakrishna Bhat, V S Arunachalam: Prec Indian Acad Sci (Engg Sci) 3, (4) (1980) 275-296.