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.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
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