The role of α-Mn precipitation on the creep mechanisms of Mg–Sr–Mn
作者： M. Celikin , M. Pekguleryuz
DOI: 10.1016/J.MSEA.2012.07.091
关键词: Intermetallic 、 Materials science 、 Atmospheric temperature range 、 Metallurgy 、 Creep 、 Precipitation (chemistry) 、 Dislocation 、 Superalloy 、 Diffusion creep 、 Phase (matter)
摘要: Abstract The creep mechanisms of cast Mg–5Sr–2Mn (JM52-wt%) and Mg–5Sr–1.25Mn (JM51-wt%) alloys are investigated via tests conducted at a temperature range 150–225 °C using 50 MPa stress (typical automotive powertrain conditions) in-depth TEM analysis. It is determined that, in both alloys, dislocational processes responsible for deformation. At the low range, pipe diffusion found to be rate determining mechanism two studied. A transition occurs high temperatures. With increasing temperature, higher activation energy (dislocation climb JM52 activated cross-slip JM51) become controlling. JM51 possesses superior resistance up 200 °C. inferior due coarsening α-Mn phase dynamically precipitated from Mg 17 Sr 2 intermetallic phase. strengthening caused by dynamic precipitation phases on dislocations intradendritic regions during creep.
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