Effect of RE Content on the Fracture Behavior in Mg-Gd-Nd-Zr Alloys

Abstract:

Article Preview

Tensile tests were performed on T4-treated specimens of GN62K (Mg-6Gd-2Nd-Zr(wt%)) and GN112K (Mg-11Gd-2Nd-Zr) alloys at room temperature and on T6-treated ones from room temperature to 300°C. The fracture behavior was investigated by using SEM images of fracture surfaces together with optical metallographs adjacent to the surface. Quasi-cleavage fracture was observed in the fracture surfaces of both alloys in T4-treated condition, and it seems that RE content has no significant effect on the fracture mechanism in T4-treated alloys. As for T6 treated condition, cracking was in a manner of transgranular cleavage and/or quasi-cleavage fracture in GN62K alloy but intergranular fracture in GN112K alloy, which implies that the fracture mechanism in T6-treated Mg-Gd-Nd-Zr alloys can be altered by the amount of RE addition. This phenomenon is interpreted in association with the relative strength of grain bulk and boundary.

Info:

Periodical:

Materials Science Forum (Volumes 546-549)

Edited by:

Yafang Han et al.

Pages:

199-202

Citation:

K. Y. Zheng et al., "Effect of RE Content on the Fracture Behavior in Mg-Gd-Nd-Zr Alloys", Materials Science Forum, Vols. 546-549, pp. 199-202, 2007

Online since:

May 2007

Export:

Price:

$38.00

[1] T.B. Massalsk: Binary Phase Diagrams (ASM International, Metals Park, Ohio, 1990).

[2] T.J. Pike, B. Noble: J. Less-Common Metals Vol. 30 (1973), p.63.

[3] G.W. Lorimer: Magnesium Technology (Institute of Metals, London, 1986), p.47.

[4] B. Smola, I. Stulíková, F. von Buch, B. L. Mordike: Mater. Sci. Eng. A Vol. 324 (2002), p.113.

[5] G. Omori, S. Matsuo, H. Asada: Trans. JIM Vol. 16 (1975), p.247.

[6] R.A. Khosrhoshahi, R. Pilkington, G.W. Lorimer, P. Lyon, H. Karimzadeh: Proceedings of the Third International Magnesium Conference (Institute of Materials, UK, 1997), p.241.

[7] T.J. Marrow, A. Bin Ahmad, I.N. Khan, S.M.A. Sim, S. Torkamani: Mater. Sci. Eng. A Vol. 387-389 (2004) 419.

[8] Y. Negishi, S. Iwasawa, S. Kamado, Y. Kojima, R. Ninomiya: J. Jpn. Inst. Light Met. Vol. 44 (1994), p.549. Fig. 4 Strength of bulk and boundary of grains in T6-treated alloys as a function of temperature.

Fetching data from Crossref.
This may take some time to load.