On the Creep Resistance of HPDC Mg-RE Based Alloys
This paper presents an analysis, based on microstructural observations by transmission electron microscopy, of the influence of chemical composition on creep resistance of high pressure die casting (HPDC) Mg-4RE-0.6Zn alloys. The improved creep resistance, by increasing the Nd/La ratio of the rare earth (RE) mixture, is shown to be associated with the supersaturation of Nd solute in the -Mg matrix, evidenced by the formation of Nd-rich precipitates on dislocations after a thermal ageing treatment. The result indicates that solid solution/precipitation strengthening of the -Mg matrix is important to the creep resistance of HPDC Mg-RE based alloys.
M.S. Dargusch & S.M. Keay
S. M. Zhu et al., "On the Creep Resistance of HPDC Mg-RE Based Alloys", Materials Science Forum, Vols. 618-619, pp. 453-458, 2009