The Effect of Ce Addition on the Creep Resistant Mg-Sr-Mn Alloys

Abstract:

Recent studies on Mg-Sr-Mn system exhibited the importance of α-Mn dynamic precipitation during creep on creep strengthening. In the present work, the effect of trace levels of Ce addition on the creep resistance of Mg-Sr-Mn system was investigated. The creep deformation in the quaternary alloys (Mg-Sr-Mn-Ce) were four times lower than the deformation seen in ternary alloys (Mg-Sr-Mn). Dynamic co-precipitation of Mg₁₂Ce and α-Mn was mainly responsible for creep strengthening. Additionally, the presence of a trace amount of Sr in the Mg matrix affected the growth of the creep-induced Mg₁₂Ce precipitates which were found to be lying parallel to the []_Mg direction. This growth orientation is different from the orientation of Mg₁₂Ce precipitates typically observed in Mg-Ce binary and Mg-Ce-Mn ternary alloys where plate-like precipitates lie along []_Mg.

• Periodical: Materials Science Forum (Volumes 783-786)
• Pages: 358-362
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.783-786.358
• Online since: May 2014
• Authors: Mert Celikin*, Mihriban Pekguleryuz
• Keywords: Creep, Dynamic Precipitation, Magnesium Alloy, Rare Earth, Transmission Electron Microscopy (TEM)

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