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Modification of texture and microstructure of magnesium alloy extrusions by particle-stimulated recrystallization

机译:颗粒刺激再结晶对镁合金挤压件组织和组织的改性

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摘要

Conventional magnesium alloy Mg-lZn-0.4Zr and a modified version of the same alloy containing Nd-based rare earth mischmetal and Y were extruded at 400℃ to study dynamic recrystallization and its role in the microstructure and texture development. Second phase particles in the modified alloy seemed to generate new orientations other than the deformed orientation. Although this occurred within small volume fraction of the material, the respective recrystallizing grains grew up to considerable sizes consuming larger volumes of the extruded microstructure and dominating the bulk texture. The consequent mechanical behavior tested in plane strain compression at room temperature demonstrated improved strain hardening behavior and enhanced ambient formability relative to the conventional alloy due to well-scattered texture and prolonged activity of basal slip within a large volume of the deformed microstructure.
机译:在400℃下挤压常规镁合金Mg-lZn-0.4Zr和包含Nd基稀土混合稀土和Y的相同合金的改进版本,以研究动态再结晶及其在微观组织和织构发展中的作用。改性合金中的第二相颗粒似乎产生了变形取向以外的新取向。尽管这发生在材料的少量体积内,但是各个重结晶晶粒长大到相当大的尺寸,这消耗了较大体积的挤压微结构并占据了整体结构。因此,在室温下进行平面应变压缩时所测试的机械性能证明,由于良好地分散了组织,并且在大量变形的微结构内基底滑移的活性延长,因此与常规合金相比,应变硬化性能得到了改善,并且环境成形性得到了提高。

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