Influence of Various Additional Elements in Al Based Filler Alloys for Automotive and Brazing Industry

  • Received : 2015.08.14
  • Accepted : 2015.09.10
  • Published : 2015.10.01


Aluminium and its alloys are widely used in brazing various components in automotive industries due to their properties like lightweight, excellent ductility, malleability and formability, high oxidation and corrosion resistance, and high electrical and thermal conductivity. However, high machinability and strength of aluminium alloys are a serious concern during casting operations. The generation of porosity caused by dissolved gases and modifiers affects seriously the strength and quality of cast product. Brazing of Al and its alloys requires careful monitoring of temperature since theses alloys are brazed at around the melting temperature in most of the aluminium alloys. Therefore, the development of low temperature brazing filler alloys as well as superior strength Al alloys for various engineering applications is always in demand. In various heat exchangers and automotive applications, poor strength of Al alloys is due to the inherent porosities and casting defects. The unstable mechanical properties is therefore needed to be controlled by adding various additive elements in the aluminium and its alloys, by a change in the heat treatment procedure or by modifying the microstructure. In this regard, this article reports the effect of various elements added in aluminium alloys to improve microstructure, brazeability, machinability, castability as well as to stabilize the mechanical properties.


Al alloy;Brazing;Microstructure;Strength;Automotive;Temperature


  1. I.J. Polmear, Light alloys From traditional alloys to nanocrystals, 4th ed., Elsevier-Butterworth Heinemann, (2006)
  2. B Altshuller: Aluminum Brazing Handbook, 4th ed., The Aluminum Association, Inc, (1990)
  3. A.H. Musfirah and A.G. Jaharah, Magnesium and Aluminum Alloys in Automotive Industry, J. Appl. Sci. Res., 8 (2012), 4865-4875
  4. F. Stadler, H. Antrekowitsch, W. Fragner, H. Kaufmann and P. J. Uggowitzer, Effect of main alloying elements on strength of Al-Si foundry alloys at elevated temperatures, Int. J. Cast Metal. Res., 25 (2012), 215-224
  5. C.J. Hang, C.Q. Wang, M. Mayer, Y.H. Tian, Y. Zhou and H.H. Wang, Growth behavior of Cu/Al intermetallic compounds and cracks in copper ball bonds during isothermal aging, Microelectron. Reliab., 48 (2008), 416-424
  6. M. H. Larsen, J. C. Walmsley, O. Lunder, R. H. Mathiesen, and K. Nisancioglu, Intergranular Corrosion of Copper-Containing AA6xxx AlMgSi aluminium alloys, J. Electrochem. Soc., 155 (11) (2008), C550-C556
  7. K. Thulukkanam, Heat Exchanger Design Handbook, 2nd ed., CRC press, Taylor and Francis group, Florida USA, 2013
  8. L.C. Tsao, W.P. Weng, M.D. Cheng, C.W. Tsao and T.H. Chuang, J. Mater. Eng. Perform., 11 (2002), 360-364.
  9. J.R. Davis, Aluminum and aluminum alloys, J. R. Davis & Associates, ASM International.
  10. Handbook Committee, 3-8.
  11. W.F. Smith, Principles of Materials Science and Engineering, McGraw-Hill, Inc. (1995)
  12. G. Venkatasubramanian, A. S. Mideen, A. K. Jha, Indian J. Sci. Technol., 5 (11) (2012), 3578-3583
  13. S.G. Shabestari, H. Moemeni, Effect of copper and solidification conditions on the microstructure and mechanical properties of Al-Si-Mg alloys, J. Mat. Process. Technol., 153-154 (2004), 193-198
  14. M. Zeren, Effect of copper and silicon content on mechanical properties in Al-Cu-Si-Mg alloys, J. Mater. Process. Technol., 169 (2005), 292-298
  15. H. Elzanaty, Effect of different Si content on the mechanical properties in the Al-based alloy, International Journal of Research in Engineering & Technology (IMPACT: IJRET), 2 (7) (2014), 49-54
  16. H. Nayeb-Hashemi, M. Lockwood, The effect of processing variables on the microstructures and properties of aluminum brazed joints, J. Mat. Sci., 37 (2002), 3705-3713
  17. D.M. Jacobson, G. Humpston, S.P.S. Sangha, Welding Research Supplement, 8 (1996), 243s-250s.
  18. J.L. Murray, A.J. McAlister, ASM Handbook Volume 3: Alloy Phase Diagrams, (1992), 312
  19. W. Dai, Song-bai Xue, F. Ji, J. Lou, B. Sun and Shui-qing Wang, Brazing 6061 aluminum alloy with Al-Si-Zn filler metals containing Sr, Int. J. Min. Met. Mater., 20 (2013), 365-370
  20. Z. Niu, J. Huang, H. Yang, S. Chen and X. Zhao, Preparation and properties of a novel Al-Si-Ge-Zn filler metal for brazing aluminum, J. Mater. Eng. Perform., (2015), in press. DOI: 10.1007/s11665-015-1509-y.
  21. L.C. Tsao, M.J. Chiang, W.H. Lin, M.D. Cheng, T.H. Chuang, Effects of zinc additions on the microstructure and melting temperatures of Al-Si-Cu filler metals, Materials Characterization, 48 (2002), 341-346
  22. E. Romhanji, M. Popovic, Problems and prospect of Al-Mg alloy applications in marine constructions, Association of Metallurgical Engineers of Serbia, Metallurgija-Journal of Metallurgy, 297-307.
  23. R. Mundt, Hoogovens, Koblenz, Introduction to Brazing of Aluminium Alloys, TALAT Lecture 4601, European Aluminium Association, 1-24
  24. Solberg, J.K., Teknologiske metaller og legeringer, NTNU, Editor. (2010)
  25. A.K. Gupta, D.J. Lloyd, S.A. Court, Precipitation hardening in Al-Mg-Si alloys with and without excess Si, Mat. Sci. Eng. A, 316 (2001), 11-17.
  26. J.P. Lynch, L.M. Brown, M.H. Jacobs, Microanalysis of age-hardening precipitates in aluminium alloys, Acta Metallurgica, 30 (1982), 1389-1395.
  27. J. Aucote, D.W. Evans, Effects of excess silicon addition on ductility of Al-0.95%Mg2Si Alloy, Mat. Sci. Technol., 12 (1978) 57-63.
  28. A.K. Dahle, K. Nogita, S.D. McDonald, C. Dinnis, L. Lu, Eutectic modification and microstructure development in Al-Si Alloys, Mat. Sci. Eng. A, 413-414 (2005) 243-248.
  29. F. Stadler, H. Antrekowitschn, W. Fragner, H. Kaufmann, E.R. Pinatel, P.J. Uggowitzer, The effect of main alloying elements on the physical properties of Al-Si foundry alloys, Mat. Sci. Eng. A 560 (2013), 481-491
  30. E.M. Elgallad, A.M. Samuel, F.H. Samuel, H.W. Doty, Effects of additives on the microstructures and tensile properties of a new Al-Cu based alloy intended for automotive castings, AFS Transactions, American Foundary Society, Paper 10-42, IL, USA, (2010), 1-24
  31. J. Li, Y. Liu, Y. Tan, Y. Li, L. Zhang, S. Wu, P. Jia, Effect of tin addition on primary silicon recovery in Si-Al melt during solidification refining of silicon, J. Cryst. Growth, 371 (2013) 1-6
  32. T.H. Chung, M.S. Yeh, L.C. Tsao, T.C. Tsai, and C.S. Wu, Development of a Low-Melting-Point Filler Metal for Brazing Aluminum Alloys, Met. Mat. Trans. A, 31A (2000), 2239-2245.
  33. S. Zor, M. Zeren, H. Ozkazan, and E. Karakulak, Effect of Titanium Addition on Corrosion Properties of Al-Si Eutectic Alloys, Protection of Metals and Physical Chemistry of Surfaces, 48 (5), (2012), 568-571
  34. M. Jaradeh, T. Carlberg, Effect of titanium additions on the microstructure of DC-cast aluminium alloys, Mat. Sci. Eng. A, 413-414 (2005), 277-282
  35. Y. Birol, A novel Al-Ti-B alloy for grain refining Al-Si foundry alloys, J. Alloy. Compd., 486 (2009), 219-222
  36. T. N. Ware, A. K. Dahle, S. Charles, M. J. Couper, Effect of Sr, Na, Ca & P on the Castability of Foundry Alloy A356.2, ASM Materials Solutions 2002 Conference & Exposition, 2nd International Aluminium Casting Technology Symposium, Columbus, Ohio, USA, October (2002), 1-10.
  37. Chen Zhongwei, Zhang Ruijie, Effect of strontium on primary dendrite and eutectic temperature of A357 aluminum alloy, China Foundry, 7 (2) (2010), 149-152
  38. B.N. Sarada, P.L. Srinivasamurthy, Swetha, Microstructural characteristics of Sr and Na modified Al-Mg-Si alloy, Int. J. Innovative Res. Sci., Eng. Tech., 2 (8) (2013), 3975-3983
  39. L. Wang, S Shivakumar, Strontium modification of aluminium alloy castings in the expendable pattern casting process, J. Mat. Sci., 30 (1995), 1584-1594
  40. J. F. Major, J. W. Rutter, Effect of strontium and phosphorus on solid/liquid interface of Al-Si eutectic, Mater. Sci. Technol., 5 (1989), 645-656
  41. Masoumeh Faraji and Hamid Khalilpour, Effect of Phosphorous Inoculation on Creep Behavior of a Hypereutectic Al-Si Alloy, JMEPEG (2014) 23:3467-3473
  42. M. O. Krasovskii1 and V. O. Lavrenko, Effect of antimony and bismuth on the electrochemical corrosion of the cast aluminium silicon alloys in 3% NaCl solution, Powder Metallurgy and Metal Ceramics, 49 (11-12) 716-721
  43. S. Farhany, A. Ourdjini, M. H. Iidris, L. T. Thai, Effect of bismuth on microstructure of unmodified and Sr-modified Al-7Si-0.4Mg alloys, Trans. Nonferrous. Met. Soc. China, 21 (2011), 1455-1464.
  44. S. Farahany, A. Ourdjini, T. A. Abu Bakar, M. H. Idris, Role of Bismuth on solidification, microstructure and mechanical properties of a near eutectic Al-Si Alloys, Met. Mater. Int., 20 (5) (2014), 929-938
  45. S. Khan, R Elliott, Effect of antimony on the growth kinetics of aluminium-silicon alloys, J. Mat. Sci., 29 (1994), 736-741
  46. Chikezie W. Onyia, Boniface A. Okorie, Simeon I. Neife, Camillus S. Obayi, Structural modification of sand cast eutectic Al-Si alloys with sulfur/sodium and its effect on mechanical properties, World Journal of Engineering and Technology, 1 (2013) 9-16
  47. J. Kajornchaiyakul, R. Sirichaivejakul, N. Moonrin, Solidification characteristics and mechanical properties of hypoeutectic aluminium-silicon alloy containing sulfur, la metallurgia italiana, 10 (2005), 47-50
  48. S. W. Nam, D. H. Lee, The effect of Mn on the mechanical behavior of Al alloys, Metals and Materials, 6 (1) (2000), 13-16
  49. A. Darvishi, A. Maleki, M. M. Atabaki, M. Zargami, Association of Metallurgical Engineers of Serbia, MJoM, 16 (1) (2010), 11-24
  50. T. O. Mbuyaa, B. O. Odera, S. P. Nganga, Influence of iron on castability and properties of aluminium silicon alloys: literature review, International Journal of Cast Metals Research, 15 (2003), 451-465
  51. N. L. Sukiman, X. Zhou, N. Birbilis, A.E. Hughes, J. M. C. Mol, S. J. Garcia, X. Zhou and G. E. Thompson, Durability and Corrosion of Aluminium and Its Alloys: Overview, Property Space, Techniques and Developments, In: Aluminium Alloys, Intech, ISBN 980-953-307-512-4. (2012)
  52. M.J. Zhu, D.Y. Ding, Y.J. Gao, G.Z. Chen, M. Li, D.L. Mao, Effect of Zn content on tensile and electrochemical properties of 3003 Al alloy, Trans. Nonferrous Met. Soc. China, 20 (2010) 2118-2123
  53. M.C. Carroll, P.I. Gouma, M.J. Mills, G.S. Daehn and B.R. Dunbar, Effects of Zn additions on the grain boundary precipitation and corrosion of Al 5083, Scripta mater., 42 (2000), 335-340
  54. Z. Li, A. M. Samuel, F. H. Samuel, C. Ravindran, S. Valtierra, Effect of alloying elements on the segregation and dissolution of CuAl2 phase in Al-Si-Cu 319 alloys, J. Mat. Sci., 38 (2003), 1203-1218
  55. Shouxun Ji, Wenchao Yang, Feng Gao, Douglas Watson, Zhongyun Fan, Effect of iron on the microstructure and mechanical property of Al-Mg-Si-Mn and Al-Mg-Si diecast alloys, Mat. Sci. Eng. A, 564 (2013), 130-139
  56. Y. Wang, Y. Xiong, Effects of beryllium in Al-Si-Mg-Ti cast alloy, Mat. Sci. Eng. A, 280 (2000), 124-127
  57. S. Murali, A. Trivedi, K.S. Shamanna, and K.S.S. Murthy, Effect of iron and combined iron and beryllium additions on the fracture toughness and microstructures of squeeze cast Al-7Si-0.3Mg alloy, JMEPEG 5 (1996), 462-468
  58. K. Venkateswarlu, V. Rajinikanth, Ajoy Kumar Ray, Cheng Xu, Terence G. Langdon, Effect of Scandium addition on an Al-2%Si alloy processed by ECAP, Rev. Adv Mater. Sci. 25 (2010), 99-106.
  59. L. L. Rokhlin, T. V. Dobatkina, N. R. Bochvar, E. V. Lysova, and I. E. Tarytina, Effect of Yttrium and Chromium on the Recrystallization of Al-Sc Alloys, Russian Metallurgy (Metally), 2007 (4) (2007), 335-339
  60. D.H. Xiao, J.N. Wang, D.Y. Ding, H.L. Yang, Effect of rare earth Ce addition on the microstructure and mechanical properties of an Al-Cu-Mg-Ag alloy, J. Alloy. Compd., 352 (2003), 84-88
  61. Tao Lu, Ye Pan, Ji-li Wu, Shi-wen Tao, and Yu Chen, Effects of La addition on the microstructure and tensile properties of Al-Si-Cu-Mg casting alloys, International Journal of Minerals, Metallurgy and Materials, 22 (4), (2015), 405-410
  62. X. M. Zhang, W. T. Wang, B. Liu, M.A. Chen, Y. Liu, Z.G. Gao, L.Y. Ye, Y.Z. Jia, Effect of Nd addition on microstructures and heat resisting properties of 2519 aluminum alloy, The Chinese Journal of Nonferrous Metals, 19(1) (2009), 15-20
  63. D.H. Xiao, BY Huang, Effect of Yb addition on precipitation and microstructure of Al-Cu-Mg-Ag alloys, Trans. Nonferrous Met. Soc. China, 17 (2007), 1181-1185
  64. Min Song, Zhenggang Wu, Yuehui He, Effects of Yb on the mechanical properties and microstructures of an Al-Mg alloy, Mat. Sci. Eng. A, 497 (2008), 519-523
  65. Ho-Cheon Yoo and Hwan-Tae Kim, Recent Technological Tendency of Joining for Lignt Aluminium Alloy, Journal of KWJS, 29 (3) (2011), 260-269 (in Korean)
  66. O.S. Song, C.S. Kang, A Study on Friction Welding of 2024 Aluminium, Journal of KWS, 8 (3) (1990), 24-30 (in Korean)

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Supported by : Korea Institute of Energy Technology Evaluation and Planning (KETEP)