Advanced SearchSearch Tips
Improvement of the Mechanical Properties of Al-7Si-0.35Mg Cast Alloys by the Optimised Combination of Alloying Elements and Heat Treatment
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
  • Journal title : Journal of Korea Foundry Society
  • Volume 36, Issue 1,  2016, pp.1-9
  • Publisher : The Korean Foundrymens Society
  • DOI : 10.7777/jkfs.2016.36.1.1
 Title & Authors
Improvement of the Mechanical Properties of Al-7Si-0.35Mg Cast Alloys by the Optimised Combination of Alloying Elements and Heat Treatment
Cho, Young-Hee; Lee, Jung-Moo; Jin, Jin-Woo; Jung, Jae-Gil;
  PDF(new window)
Improvement of the mechanical properties of a commercial aluminium casting alloy, A356, was achieved through an optimised combination of alloying elements, modification, and heat treatment. 0.7 wt.% Cu and an additional 0.2 wt.% Mg were added to an Al-7Si-0.35Mg alloy for strengthening at both room and elevated temperatures, whilst a subsequent decrease in the ductility was compensated for by the modification of eutectic Si by Sr addition at a level of up to 110 ppm. It was found that the dissolution of Cu-rich or Mg-rich phases could be maximised by solid-solutionising an alloy with 40 ppm Sr at , increasing the tensile and yield strengths to 350 MPa and 297 MPa, respectively, with a reasonably high strain of 5% after peak-aging at . Further addition of Sr up to 110 ppm is, however, more likely to interfere with the dissolution of the Cu-rich or Mg-rich phases during solid solution treatment, resulting in a slight decrease in both tensile and yield strengths at room temperature. Besides the Cu addition, such undissolved phases, on the other hand, may contribute to elevated temperature strength at .
Aluminium foundry alloys;Modification;Heat treatment;Microstructure;Mechanical properties;
 Cited by
K.T. Kashyap, S. Murali, K.S. Raman and K.S.S. Murthy, Mater. Sci. Technol., "Casting and heat treatment variables of Al-7Si-Mg alloy", 9 (1993) 189-203. crossref(new window)

D.L. Zhang and L. Zheng, Metall. Mater. Trans. A, "The quench sensitivity of cast Al-7 wt pct Si-0.4 wt pct Mg alloy", 27A (1996) 3983-3991.

D.L. Zhang, L.H. Zheng and D.H. StJohn, J. Light Met., "Effect of a short solution treatment time on microstructure and mechanical properties of modified Al-7wt.%Si-0.3 wt.%Mg alloy", 2 (2002) 27-36. crossref(new window)

E. Sjolander and S. Seifeddine, J. Mater. Processing Technol., "The heat treatment of Al-Si-Cu-Mg casting alloys", 210 (2010) 1249-1259. crossref(new window)

P.A. Rometsch and G.B. Schaffer, Mater. Sci. Eng. A, "An age hardening model for Al-7Si-Mg casting alloys", 325 (2002) 424-434. crossref(new window)

D.J. Chakrabarti and D.E. Laughlin, Prog. Mater. Sci., "Phase relations and precipitation in Al-Mg-Si alloys with Cu additions", 49 (2004) 389-410 crossref(new window)

R.X. Li, R.D. Li, Y.H. Zhao, L.Z. He, C.X. Li, H.R. Guan and Z.Q. Hu, Mater. Lett., "Age-hardening behavior of cast Al-Si base alloy", 58 (2004) 2096-2101. crossref(new window)

S. Zafar, N. Ikram, M.A. Shaikh and K.A. Shoaib, J. Mater. Sci., "Microstructure studies in Al-6%Si-1.9%Cu-x%Mg alloys", 25 (1990) 2595-2597. crossref(new window)

K. Matsuda, Y. Uetani, T. Sato and S. Ikeno, Metall. Mater. Trans. A, "Metastable phases in an Al-Mg-Si alloy containing copper", 32A (2001) 1293-1299.

Jeong CY, Mater. Trans., "High temperature mechanical properties of Al-Si-Mg-(Cu) alloys for automotive cylinder heads", 54 (2013) 588-594. crossref(new window)

L. Ceschini, A. Morri, A. Morri, F. Rotundo and S. Toschi, La Met. Iitaliana, "Heat treatment response and influence of overaging on mechanical properties of C355 cast aluminum alloy", 5 (2014) 11-17.

M. Tash, F.H. Samuel, F. Mucciardi and H.W. Doty, Mater. Sci. Eng. A, "Effect of metallurgical parameters on the hardness and microstructural characterization of as-cast and heat-treated 356 and 319 aluminum alloys", 443 (2007) 185-201. crossref(new window)

S. Shivkumar, S. Ricci, Jr., C. Keller and D. Apelian, J. Heat Treat., "Effect of solution treatment parameters on tensile properties of cast aluminum alloys", 8 (1990) 63-70. crossref(new window)

C.H. Caceres, C. J. Davidson and J. R. Griffiths, Mater. Sci. Eng. A, "The deformation and fracture behavior of an Al-Si-Mg casting alloy", 197 (1995) 171-179. crossref(new window)

Q.G. Wang, Met. Mater. Trans. A, "Microstructural effects on the tensile and fracture behavior of aluminum casting alloys A356/357", 34A (2003) 2887-2899.

L. Ceschini, A. Morri, A. Morri and G. Pivetti, Mater. Des., "Predictive equations of the tensile properties based on alloy hardness and microstructure for an A356 gravity die cast cylinder head", 32 (2011) 1367-1375. crossref(new window)

L. Pedersen and L. Arnberg, Metall. Mater. Trans. A, "The effect of solution heat treatment and quenching rates on mechanical properties and microstructures in AlSiMg foundry alloys", 32A (2001) 525-532.

B. Closset and J. E. Gruzleski, AFS Trans., "Study on the use of pure metallic strontium in the modification of Al-Si alloys", 89 (1982) 801-808

B. Closset and J.E. Gruzleksi, Metall. Trans. A, "Structure and properties of hypoeutectic Al-Si-Mg alloys modified with pure strontium", 13A (1982) 945-951

L. Lasa and J.M. Rodriguez-Ibabe, J. Mater. Sci., "Evolution of the main intermetallic phases in Al-Si-Cu-Mg casting alloys during solution treatment", 39 (2004) 1343-1355. crossref(new window)

S.K. Chaudhury and D. Apelian, Metall. Mater. Trans. A, "Fluidized bed heat treatment of cast Al-Si-Cu-Mg alloys", 37A (2006) 2295-2311.

J.H. Sokolowski, X-C. Sun, G. Byczynski, D.O. Northwood, D.E. Penrod, R. Thomas and A. Esseltine, J. Mater. Processing Technol., "The removal of copper-phase segregation and the subsequent improvement in mechanical properties of cast 319 aluminum alloys by a two-stage solution heat treatment", 53 (1995) 385-392. crossref(new window)

G. Wang, Q. Sun, L. Feng, L. Hui and C. Jing, Mater. Des., "Influence of Cu content on ageing behavior of AlSiMgCu cast alloys", 28 (2007) 1001-1005. crossref(new window)

M.A. Moustafa, F.H. Samuel and H.W. Doty, J. Mater. Sci., "Effect of solution heat treatment and additives on the microstructure of Al-Si (A413.1) automotive alloys", 38 (2003) 4507-4522. crossref(new window)

I. Aguilera Luna, H. Mancha Molinar, M.J. Castro Roman, J.C. Escobedo Bocardo and M. Herrera Trejo, Mater. Sci. Eng. A, "Improvement of the tensile properties of an Al-Si-Cu-Mg aluminum industrial alloy by using multi stage solution heat treatments", 561 (2013) 1-6. crossref(new window)

S.D. McDonald, K. Nogita and A.K. Dahle, Acta Mater., "Eutectic nucleation in Al-Si alloys", 52 (2004) 4273-7280. crossref(new window)

Cho YH, Lee HC, Oh KH and A.K. Dahle, Metall. Mater. Trans. A, "Effect of strontium and phosphorus on eutectic Al-Si nucleation and formation of ${\beta}$-$Al_5FeSi$ in hypoeutectic Al-Si foundry alloys", 39A (2008) 2435-2448.

M. Timpel, N. Wanderka, R. Grothausmann and J. Banhart, J. Alloys Comp., "Distribution of Fe-rich phases in eutectic grains of Sr-modified Al-10wt.%Si-0.4wt.%Fe casting alloy", 558 (2013) 18-25. crossref(new window)

J.H. Sokolowski, M.B. Djurdjevic, C.A. Kierkus and D.O. Northwood, J. Mater. Processing Technol., "Improvement of 319 aluminum alloy casting durability by high temperature solution treatment", 109 (2001) 174-180. crossref(new window)