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Individual effect of recrystallisation nucleation sites on texture weakening in a magnesium alloy: Part 2- shear bands
Acta Materialia ( IF 8.3 ) Pub Date : 2017-12-19 , DOI: 10.1016/j.actamat.2017.12.019
Dikai Guan , W. Mark Rainforth , Junheng Gao , Le Ma , Brad Wynne

The entire recrystallisation process of a cold-rolled WE43 Mg alloy containing a high density of shear bands was tracked using a quasi-in-situ electron backscatter diffraction method. The results showed the resultant recrystallised texture arose principally from recrystallisation within shear bands rather than from deformation twins, which made a negligible contribution to the final texture. Only a weakened basal texture with scattered weak texture components was observed after annealing at 450 °C and 490 °C. This is in contrast to the widely reported “Rare Earth” textures, believed to come from shear band recrystallisation. The texture appeared during the nucleation of recrystallised grains and was preserved during subsequent grain growth. Simultaneous occurrence of precipitation on grain and twin boundaries during recrystallisation suppressed any potential preferential grain growth. When annealed at 545 °C, at which temperature both solute drag and Zener pinning were eliminated, a non-basal texture was produced after annealing due to orientated grain growth governed by different grain boundary mobility between basal and off-basal grains.



中文翻译:

重结晶成核位点对镁合金织构弱化的单独影响:第2部分:剪切带

使用准原位跟踪包含高剪切带密度的冷轧WE43 Mg合金的整个重结晶过程电子背散射衍射法。结果表明,产生的重结晶织构主要是由剪切带内的重结晶引起的,而不是由变形孪晶产生的,这对最终织构的贡献可忽略不计。在450°C和490°C退火后,仅观察到具有散布的弱纹理成分的弱化基础纹理。这与广泛报道的“稀土”织构相反,后者被认为来自剪切带的再结晶。质地在再结晶晶粒的成核过程中出现,并在随后的晶粒生长过程中得以保留。在再结晶过程中,在晶粒和双晶界上同时发生沉淀抑制了任何潜在的优先晶粒生长。当在545°C下退火时,在该温度下,溶质阻力和齐纳钉扎现象都消除了,

更新日期:2017-12-19
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