Strength and elongation of spray formed Al-Si-Pb alloys

Abstract

The strength and elongation to fracture of spray deposited Al-Si-Pb alloys were studied as a function of lead content, silicon content, and distance from the centre to periphery of the deposit. It is found that the ultimate tensile strength, proof stress and elongation to fracture decrease, linearly and exponentially, with the increase in lead content and porosity of the deposit, respectively. Both the strengths and elongation to fracture linearly increase with increasing distance from the centre to periphery of the deposit. The ultimate tensile strength and proof stress are higher at a higher silicon content and they have a linear relationship with the hardness of the deposit.

Keywords

aluminum silicon alloys / spray forming / tensile strength / proof stress / elongation

References

[1] Mohan S, Pathak JP, Chander N, Sarkar S. Surface studies of centrifugally cast aluminum-based lead bearing composites. J. Reinf. Plast. Compos., 2008, 27(13): 1461.

[2] Ran G, Zhou JE, Xi SQ, Li PL. Microstructure and morphology of Al-Pb bearing alloy synthesized by mechanical alloying and hot extrusion. J. Alloys Compd., 2006, 419(1–2): 66.

[3] An J, Liu YB, Lu Y, Zhang QY. The formation of reacted film and its influence on tribological properties of extruded Al-Si-Cu-20-25Pb alloy under dry sliding. J. Mater. Sci., 2003, 38(9): 1975.

[4] Yu FX, Dwarakadasa DS, Ranganathan S. Microstructure and mechanical properties of spray-formed Al-Si-Pb alloys. J. Mater. Process. Technol., 2003, 137(1–3): 164.

[5] An J, Dong C, Zhang QY. Improvement of the wear behavior of stircast Al-Si-Pb alloys by hot extrusion. Tribol. Int., 2003, 36, 25.

[6] An J, Liu YB, Lu Y. The influence of Pb on the friction and wear behavior of Al-Si-Pb alloys. Mater. Sci. Eng. A, 2004, 373(1–2): 294.

[7] Fang X, Fan Z. Rheo-diecasting of Al-Si-Pb immiscible alloys. Scripta Mater., 2006, 54, 789.

[8] Padhi P, Anand SK, Kar D, Ghosh S, Panigrahi SK. Modeling structure of Al-Sn alloy. Mater. Sci. Forum, 2006, 519–521, 1519.

[9] Rudrakshi GB, Srivastava VC, Pathak JP, Ojha SN. Spray forming of Al-Si-Pb alloys and their wear characteristics. Mater. Sci. Eng. A, 2004, 383(1): 30.

[10] Mazzer EM, Afonso CRM, Bolfarini C, Kiminami CS. Microstructure study of Al 7050 alloy reprocessed by spray forming and hot-extrusion and aged at 121°C. Intermetallics, 2013, 43, 182.

[11] Mazzer EM, Afonso CRM, Galano M, Kiminami CS, Bolfarini C. Microstructure evolution and mechanical properties of Al-Zn-Mg-Cu alloy reprocessed by spray-forming and heat treated at peak aged condition. J. Alloys Compd., 2013, 579, 169.

[12] Suh YC, Lee ZH. Nucleation of liquid Pb-phase in hypermonotectic Al-Pb melt and the segregation of Pb-droplets in melt-spun ribbon. Scripta Metall. Mater., 1995, 33(8): 1231.

[13] Cui CS, Fritsching U, Schulz A. Three-dimensional mathematical modeling and numerical simulation of billet shape in spray forming using a scanning gas atomizer. Metall. Mater. Trans. B, 2007, 38(2): 333.

[14] Ojha KV, Tomar A, Singh D, Kaushal GC. Shape, microstructure and wear of spray formed hypoeutectic Al-Si alloys. Mater. Sci. Eng. A, 2008, 487, 591.

[15] Mi J, Grant PS. Modelling the shape and thermal dynamics of Ni superalloy rings during spray forming: Part 1. Shape modelling — Droplet deposition, splashing and redeposition. Acta Mater., 2008, 56(7): 1588.

[16] Liu DM, Zhao JZ, Li MS. Modeling and experimental verification of tubular product formation during spray forming. Trans. Nonferrous Met. Soc. China, 2009, 19(3): 661.

[17] Mittal R, Singh D. Dry sliding wear behaviour of spray formed ZrSiO₄ reinforced Al-Si-Sn alloy. Adv. Mater. Lett, 2012, 3(1): 38.

[18] Rudrakshi GB, Srivastava VC, Ojha SN. Microstructural development in spray formed Al-3.5Cu-10Si-20Pb alloy and its comparative wear behaviour in different environmental conditions. Mater. Sci. Eng. A, 2007, 457(1): 100.

[19] Singh D, Dangwal S. Effects of process parameters on surface morphology of metal powders produced by free fall gas atomization. J. Mater. Sci., 2006, 41(12): 3853.

[20] Hagege S. Lead inclusions in silicon: structure, morphology and thermal behavior. Interface Sci., 1999, 7, 85.

[21] Tomar A, Singh D. Porosity in disk shape spray formed Al-Si-Pb alloy preform. Powder Metall. Min., 2012 4.

[22] Prasada Rao AK, Das K, Murty BS, Chakraborty M. Effect of grain refinement on wear properties of Al and Al-7Si alloy. Wear, 2004, 257(1–2): 148.

[23] Bocchini GF. The influences of porosity on the characteristics of sintered materials. Int. J. Powder Metall., 1986, 22(3): 185.

[24] Payne RD, Moran AL, Cammarata RC. Relating porosity and mechanical properties in spray formed tubulars. Scripta Metal. Mater., 1993, 29(7): 907.