Effect of In-Situ TiB₂ Particle Addition on the Mechanical Properties of AA 2219 Al Alloy Composite

N.R. Rajasekaran, V. Sampath

Department of Metallurgical and Materials Engineering Indian Institute of Technology Madras Chennai – 600 036.

DOI: 10.4236/jmmce.2011.106040                

Abstract

Aluminium alloy AA2219 was reinforced with TiB2 particles introduced in-situ by the saltmetal reaction technique. The microstructural examinations of the composites clearly reveal the formation of TiB₂ particles with a hexagonal morphology. The addition of TiB₂ particles results in increased mechanical properties, such as 0.2%YS, UTS and hardness. The improvement in mechanical properties is correlated to the microstructure.

Keywords

AA 2219 Al alloy; in-situ composite; salt-metal technique.

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	J.R. Davis, ASM Speciality Handbook: Aluminium and Aluminium Alloys 1993.
[2]	N. Kamp et al. 2007,” Influence of grain structure and slip planarity on fatigue crack growth in low alloying artificially aged 2xxx aluminum alloys” Int. J. Fatigue, 29, pp.869-878.
[3]	K. Surekha, B.S. Murty, K. Prasad Rao , 2008, “ Microstructural characterization and corrosion behavior of multi pass friction stir processed AA 2219 aluminium alloy” Surface Coatings and Technology, 202, pp. 4057-4068.
[4]	P. Srinivasa Rao, K.G. Sivadasn, P.K. Balasubramanian, 1996, “Structure- Property correlation on AA 2219 aluminium alloy weldments” Bulletin of Material Science 19, pp. 549-557.
[5]	Tiejun Ma et al, 2003, “Dry sliding wear behaviour of cast SiC-reinforced Al MMCs” Materials Science and Engineering A, 360, pp.116-125.
[6]	A. Jha, C. Dometakis, 1997, “The dispersion mechanism of TiB2 ceramic phase in molten aluminium and its alloys” Materials & Design 18, pp. 297-301.
[7]	X. Wang et al 1999, “ Microstructural analysis of Al alloys dispersed with TiB2 particulate for MMC applications “ Journal of Microscopy, 196, pp 137-145.
[8]	I.G. Watson et al. 2005, “Investigation of the clustering behaviour of titanium diboride particles in aluminium” Composites: Part A, 36, pp 1177-1187.
[9]	T. Shanmugasundaram, B.S. Murty, V. Subramanya Sarma, 2006, “ Development of ultrafine grained high strength Al-Cu alloy by cryorolling” Scripta Materialia 54, pp.2013-2017
[10]	L. Iain, Principles of Mechanical Metallurgy, Edward Arnold, Ltd., 1981, pp.155
[11]	Degang Zhao et al, 2005, “In-situ preparation of Al matrix Composites reinforced by TiB2 Particles and sub micron ZrB2” Journal of Material Science, 40, pp 4365-4368.