Microstructural Characterization of Al-Zr Alloy with Nano-Sized Grains

Abstract:

Article Preview

The mechanical alloying processes was employed to fabricate Al-4at.%Zr alloy with nano-sized grains and very fine Al3Zr compounds. The phase transformations and the stability of the phases formed during mechanical alloying and heat treatment processes were investigated. The grain sizes of the alloys immediately after milling and following the subsequent heat treatment at 550°C were 54.2nm and 106.4nm, respectively. Some of Zr atoms were dissolved into the Al matrix and most of them reacted with hydrogen produced by decomposition of PCA(process control agent) to form ZrH2 during mechanical alloying process. These ZrH2 hydrides decomposed gradually after the heat treatment. Stable Al3Zr with a DO23 structure was formed by heat treatment at temperature of more than 4500C. The hardness of the Al-4at.%Zr alloy was more than two times higher than those of other Al-based alloys.

Info:

Periodical:

Key Engineering Materials (Volumes 326-328)

Edited by:

Soon-Bok Lee and Yun-Jae Kim

Pages:

429-432

DOI:

10.4028/www.scientific.net/KEM.326-328.429

Citation:

I. H. Kim et al., "Microstructural Characterization of Al-Zr Alloy with Nano-Sized Grains", Key Engineering Materials, Vols. 326-328, pp. 429-432, 2006

Online since:

December 2006

Export:

Price:

$35.00

[1] G. J. Hildeman and M. J. Koczak : High Strength Powder Metallurgy Aluminium AlloyⅡ, TMS, Warrendale (1986).

[2] J. Q. Guo and K. Ohtera : Mater. Lett., Vol. 27 (1996), p.343.

[3] E. Nes : Acta Met., Vol. 20 (1972), p.499.

[4] K. M. Lee and I. H. Moon: Mater. Sci. Eng., Vol. A185 (1994), p.165.

[5] Y. C. Cheng, S. H. Wang, P. W. Kao and C. P. Chang: Mater. Sci. Forum, Vol. 217 (1996), p.1891.

[6] Liang Guoxian, Li Zhichao and Wang Erde: J. Mater. Sci., Vol. 31 (1996), p.901.

[7] R. Vivekanandan and T.R.N. Kutty : Powder Tech. Vol. 57 (1989), p.181.

[8] C. Suryanarayana : Prog. Mater., Vol. 46 (2001), p.1.

[9] E. Gaffet, M. Harmelin and F. Faudot : J. of Alloys and Compounds, Vol. 23 (1993), p.194.

[10] J. Keskinen, A. Pogang, J. Rubin and P. Ruuskanen : Mater. Sci. Eng. A, Vol. 196 (1995), p.205.

[11] X. P. Niu, L. Froyen, L. Dealey and C. Peytour : Scripta Metall. Mater., Vol. 30 (1994), p.13.

[12] J. C. Lee, H. K. Seok and J. Y. Suh : Acta mater., Vol. 50 (2002), p.4005.

[13] Y. S. Sato, M. Urata, H. Kokawa and K. Ikeda: Scripta mater., Vol. 47 (2002).

In order to see related information, you need to Login.