Grain Refinement of AZ61/SiCp Magnesium Matrix Composites for Tubes Extruded by Hot Extrusion Processes

Abstract:

Article Preview

Magnesium (Mg) alloys are gaining more recognition as a lightest structural material for light-weight applications, due to their low density and high stiffness-to-weight ratio. Nevertheless, their ductility is still not good for further metal forming and their strength is not large enough for real structure applications. The aim of this paper is to develop new magnesium metal matrix composites (Mg MMCs) reinforced with SiC particles by the stir-casting method for the hot extrusion processes to produce tubes. AZ61/SiCp MMCs ingots reinforced with 1, 2, and 5 wt% SiC particles are fabricated by the melt-stirring technique. AZ61/SiCp MMCs tubes are manufactured by hot extrusion using a specially designed die-set for obtaining uniform thickness distribution tubes. Finally, the mechanical properties of the reinforced AZ61/SiCp MMCs and Mg alloy AZ61 tubes are compared with those of the billets to manifest the advantages of extrusion processes and addition of SiC particles. The microstructures of the billet and extruded tubes are also observed. Obvious grain size refinement both by addition of particles and extrusion process are discovered.

Info:

Periodical:

Edited by:

Robert V. Goldstein, Dr. Yeong-Maw Hwang, Yeau Ren Jeng and Cho-Pei Jiang

Pages:

135-143

Citation:

S. J. Huang et al., "Grain Refinement of AZ61/SiCp Magnesium Matrix Composites for Tubes Extruded by Hot Extrusion Processes", Key Engineering Materials, Vol. 528, pp. 135-143, 2013

Online since:

November 2012

Export:

Price:

$38.00

[1] P. -Ch. Lin, S. -J. Huang, P. -S. Hong, Formation of magnesium metal matrix composites Al2O3p/AZ91D and their mechanical properties after heat treatment, Acta Metallurgica Slovaca, 16 (2010) 237-245.

[2] S. -J. Huang and Z. -W. Chen, Microstructure of AlN particles reinforced AZ91D Mg-based metal-matrix composites, Acta Metallurgica Slovaca, 16 (2010) 246-253.

[3] S. -J. Huang and Z. -W. Chen, Grain refinement of AlNp/ AZ91D megnesium metal-matrix composites, Kov. Mater. / Met. Mater., 49 (2011) 259-264.

DOI: https://doi.org/10.4149/km_2011_4_259

[4] S. -J. Huang, Y. -R. Jeng, V.I. Semenov, Y. -Z. Dai, Particle Size Effects of Silicon Carbide on Wear Behavior of SiCp-Reinforced Magnesium Matrix Composites, Tribology Letters, 42 (2011) 79-87.

DOI: https://doi.org/10.1007/s11249-011-9751-4

[5] M.K.K. Oo, P.S. Ling, M. Gupta, Characteristics of Mg-Based composites synthesized using a novel mechanical disintegration and deposition technique, Metall Mater Trans A 31 (2000) 1873-1881.

DOI: https://doi.org/10.1007/s11661-006-0241-5

[6] B.V. M. Kumar, B. Basu, V.S.R. Murthy, M. Gupta, The role of tribochemistry on fretting wear of Mg-SiC particulate composites, Composites: Part A 36 (2005) 13-23.

DOI: https://doi.org/10.1016/j.compositesa.2004.06.032

[7] M. Manoharan, S.C.V. Lim, M. Gupta, Application of a model for the work hardening behavior to Mg/SiC composites synthesized using a fluxless casting process, Materials Science and Engineering A333 (2002) 243-249.

DOI: https://doi.org/10.1016/s0921-5093(01)01845-7

[8] B.W. Chua, L. Lu, M.O. Lai, Influence of SiC particles on mechanical properties of Mg based Composite, Composite Structures 47 (1999) 595-601.

DOI: https://doi.org/10.1016/s0263-8223(00)00031-3

[9] S.C.V. Lim and M. Gupta, Enhancing the microstructural and mechanical response of a Mg/SiC formulation by the method of reducing extrusion temperature, Materials Research Bulletin, 36 (2001) 2627-2636.

DOI: https://doi.org/10.1016/s0025-5408(01)00750-4

[10] S. Ugandhar, M. Gupta and S.K. Sinha, Enhancing strength and ductility of Mg/SiC composites using recrystallization heat treatment, Composite Structures, 72 (2006) 266-272.

DOI: https://doi.org/10.1016/j.compstruct.2004.11.010

[11] B.W. Chua, L. Lu and M.O. Lai, Influence of SiC particles on mechanical properties of Mg based Composite, Composite Structures, 47 (1999) 595-601.

DOI: https://doi.org/10.1016/s0263-8223(00)00031-3

[12] A. El-Morsy, A. Ismail and M. Walyb, Microstructural and mechanical properties evolution of magnesium AZ61 alloy processed through a combination of extrusion and thermomechanical processes, Materials Science and Engineering A, 486 (2008) 528-533.

DOI: https://doi.org/10.1016/j.msea.2007.09.044

[13] P. Poddar, V.C. Srivastava, P.K. De and K.L. Sahoo, Processing and mechanical properties of SiC reinforced cast magnesium matrix composites by stir casting process, Materials Science and Engineering A, 460-461 (2007) 357-364.

DOI: https://doi.org/10.1016/j.msea.2007.01.052

[14] L. Liu, H. Zhou, Q. Wang, Y. Zhu and W. Ding, Dynamic recrystallization behavior of AZ61 magnesium alloy, Journal of Materials Online, 2 (2006) 1-12.