Formation of Ti-Matrix Composites for Lightweight Structural Components by Mechanical Alloying and Subsequent Annealing

Abstract:

In this work, a lightweight Ti-10Mg-5Al (wt. %) alloy for structural components was produced by mechanical alloying. A metastable α-Ti(Al,Mg) solid solution was obtained after 50h of milling. Diffraction peaks ascribed to the Mg phase were detected in the XRD pattern of the sample heat treated at 600°C. This phase tends to oxidize with the increase of temperature giving rise to MgO. The structure of the mechanically alloyed and 900°C heat treated sample consisted of a Ti(Al) solid solution with dispersed MgO particles in the matrix. Hardness and Young’s modulus values obtained from ultramicrohardness tests confirm the strength improvement of the Ti-based alloy due to the MgO reinforcement.

• Periodical: Materials Science Forum (Volumes 514-516)
• Pages: 609-613
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.514-516.609
• Online since: May 2006
• Authors: Bruno Trindade, Marco Caetano, Nelson Duarte
• Keywords: Lightweight Alloys, Mechanical Alloying (MA), Metal Matrix Composite (MMC), TiAl

References

[1] L. Dias, C. Coelho, B. Trindade and F.H. Froes: Key Engineering Materials, vol. 230-232 (2002), p.283.

[2] J.B. Zhou and K.P. Rao: J. Alloys and Compd. vol. 384 (2004) p.125.

[3] F. Simões, B. Trindade, J.A. Santos and F.H. Froes: Materials Technology vol. 18/2 (2003), p.98.

[4] L. Dias, C. Coelho, B. Trindade and F.H. Froes: Mater. Sci. Eng. A vol. 364 (2004), p.273.

[5] J.M. Antunes, A. Cavaleiro, L.F. Menezes, M.I. Simões and J.V. Fernandes: Surf. Coat. Technol. vol. 149 (2002), p.27.

[6] G. Williamson and W.H. Hall: Acta Met. vol. 1 (1953), p.22.

[7] D.M.J. Wilkes, P.S. Goodwin, C.M. Ward-Close, K. Bagnall and J. Steeds: Materials Letters vol. 27 (1996), p.47.

DOI: 10.1016/0167-577x(95)00265-0