Effect of solute Mn on microstructural evolution of Cu–Mn alloys processed by equal channel angular pressing
Source abstract
Abstract
The effect of solute atoms on microstructural evolution and grain refinement during equal channel angular pressing (ECAP) was investigated using Cu–Mn alloys where the change of stacking fault energy (SFE) is very small regardless of Mn concentration up to 12 at%. Solute Mn significantly affected the accumulation of dislocations with a resulting decrease in grain size. Cu–10at%Mn formed rare deformation twins and a final grain size of 71 nm. This final grain size is comparable to that of Cu–9at%Al which has comparatively low SFE. The microstructures of Cu–Mn alloys continually developed with persistent strain hardening up to eight passes, whereas that of pure Cu saturated in smaller strain. This strong effect of solute Mn for suppressing dynamic recovery, and associated persistent strain hardening and grain refinement may result from high planarity of dislocation glide, in addition to the solute effect stemming from elastic interaction between solute and matrix.
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Research context
OpenAlex topics: Microstructure and mechanical properties · Metallurgy and Material Forming · Aluminum Alloys Composites Properties
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References (70)
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