Fabrication of a New Al-Ti-C Master Alloy and its Refining Effect on AZ31

Abstract:

The Al-Ti-C master alloy with excessive carbon content was prepared by the self-propagating high-temperature synthesis (SHS) in melt method. The master alloy mainly contains Al₄C₃ and TiC phases, which exhibits satisfactory refining effect on AZ31 alloy. With 1.5wt.% addition of the master alloy, the grain size reduced from 280 μm to 109 μm. The tensile properties are also improved with the refinement of grain structure. The ultimate tensile strength increased from 105 MPa to 156 MPa while the elongation increased from 8.4% to 13.6%. The Al₄C₃ particles and TiC particles play important role in the refining process due to their low disregistry with α-Mg grains.

• Periodical: Materials Science Forum (Volume 833)
• Pages: 28-32
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.833.28
• Online since: November 2015
• Authors: Xiao Teng Liu, Xiao Xu Zhu, Yu Zhen Zhao, Hai Hao*
• Keywords: Al-Ti-C Master Alloy, Grain Refinement, Magnesium Alloy

References

[1] Y. Birol, Grain refining efficiency of Al-Ti-C alloys, J. Alloy Compd. Vol. 422 (2006) 128-131.

DOI: 10.1016/j.jallcom.2005.11.059

[2] G. Han, X. Liu, H. Ding, Grain refinement of AZ31 magnesium alloy by new Al-Ti-C master alloys, T. Nonferr. Metal. Soc. Vol. 19 (2009) 1057-1064.

DOI: 10.1016/s1003-6326(08)60406-9

[3] H. Y. Wang, F. Zhao, Q. C. Jiang, Y. Wang, B. X. Ma, Effect of Mg addition on the self-propagating high temperature synthesis reaction in Al-Ti-C system, J. Mater. Sci. Vol. 40 (2005) 1255-1257.

DOI: 10.1007/s10853-005-6946-9

[4] A.K. Chaubey, B.K. Mishra, N.K. Mukhopadhyay, P.S. Mukherjee, Effect of compact density and preheating temperature of the Al-Ti-C preform on the fabrication of in situ Mg-TiC composites, J. Mater. Sci. Vol. 45 (2010), 1507-1013.

DOI: 10.1007/s10853-009-4114-3

[5] H.Y. Wang, Q.C. Jiang, X.L. Li, F. Zhao, Effect of Al content on the self-propagating high-temperature synthesis reaction of Al-Ti-C system in molten magnesium, J. Alloy Compd. Vol. 366 (2004) 9-12.

DOI: 10.1016/s0925-8388(03)00737-0

[6] H.Y. Wang, Q.C. Jiang, X.L. Li, J.G. Wang, In situ synthesis of TiC/Mg composites in molten magnesium, Scripta Mater. Vol. 48 (2003) 1349-1354.

DOI: 10.1016/s1359-6462(03)00014-9

[7] W. C. Lee, S. L. Chung, Ignition phenomena and reaction mechanisms of the self-propagating high-temperature synthesis reaction in the titanium-carbon-aluminum system, J. Am. Ceram. Soc. Vol. 80 (1) (1997) 53-61.

DOI: 10.1111/j.1151-2916.1997.tb02790.x

[8] Z. W. Liu, M. Rakita, Q. Han, J. G. Li, A Developed Method for Fabricating In-Situ TiC p /Mg Composites by Using Quick Preheating Treatment and Ultrasonic Vibration, Metall. Mater. Trans. A Vol. 43A (2012) 2116-2124.

DOI: 10.1007/s11661-011-1041-0

[9] Z. Q. Wang, X. F. Liu, J. Y. Zhang, X. F. Bian, Study of the reaction mechanism in the Al-C binary system through DSC and XRD, J. Mater. Sci. Vol. 39 (2004) 2179-2181.

DOI: 10.1023/b:jmsc.0000017782.61749.36

[10] Y. Zhou, Z. Q. Li, Structural characterization of a mechanical alloyed Al–C mixture, J. Alloy Compd. Vol. 414 (2006) 107-112.

[11] R. Mahmudi, Grain boundary strengthening in a fine grained aluminium alloy, Scripta Mater. Vol. 32 (1995) 781-786.

DOI: 10.1016/0956-716x(95)91603-m

[12] S. Rajasekhara, P.J. Ferreira, L.P. Karjalainen, A. Kyröläinen, Hall-Petch Behavior in Ultra-Fine-Grained AISI 301LN Stainless Steel, Metall. Mater. Trans. A Vol. 38A (2007) 1202-1210.

DOI: 10.1007/s11661-007-9143-4

[13] L. Lu, A. K. Dahle, D. H. Stjohn, Heterogeneous nucleation of Mg–Al alloys, Scripta Mater. Vol. 54(12) (2006) 2197-2201.

DOI: 10.1016/j.scriptamat.2006.02.048

[14] B. S. Murty, S. A. Kori, M. Chakraborty, Grain refinement of aluminium and its alloys by heterogeneous nucleation and alloying, Int. Mater. Rev. Vol. 47(1) (2002) 3-29.

DOI: 10.1179/095066001225001049

[15] L. Lu, A. K. Dahle, D. H. Stjohn, Grain refinement efficiency and mechanism of aluminium carbide in Mg-Al alloys, Scripta Mater. Vol. 53(5) (2005) 517-522.

DOI: 10.1016/j.scriptamat.2005.05.008

[16] C. H. Xu, Taiyuan: Tiyuan University of Technology, (2010) 34-45.