Controlling the microstructure and improving the tensile properties of extruded Mg-Sn-Zn alloy through Al addition
作者： Sang-Hoon Kim , Jong Un Lee , Ye Jin Kim , Jae-Gil Jung , Sung Hyuk Park
DOI: 10.1016/J.JALLCOM.2018.04.063
关键词:
摘要: Abstract This study demonstrates that the addition of 4 wt% Al to Mg-7Sn-1Zn alloy effectively promotes dynamic recrystallization and precipitation behaviors during extrusion significantly improves tensile properties extruded alloy. The dramatically increases area fraction dynamically recrystallized (DRXed) grains is mainly attributed particle-stimulated nucleation effect induced by undissolved Mg2Sn particles, increased amount grain boundaries owing refinement billet, increase in stress applied extrusion. fine precipitates also with addition, an number sites for precipitation; this, turn, leads a reduction size through enhanced grain-boundary pinning caused precipitates. As result, compressive strengths considerably improved which due combined effects solute atoms, more precipitates, reduced size. Furthermore, suppresses formation twins—which can act as cracking sites—during deformation; this results considerable elongation
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