Facilitating Basal Slip to Increase Deformation Ability in Mg-Mn-Ce Alloy by Textural Reconstruction Using Friction Stir Processing
Facilitating Basal Slip to Increase Deformation Ability in Mg-Mn-Ce Alloy by Textural Reconstruction Using Friction Stir Processing
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DOI：
10.1007/s11661-013-1746-3
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发表时间：
2013-04
期刊：
影响因子：
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通讯作者：
Feng-chao Liu;Zongyi Ma;M. Tan
中科院分区：
文献类型：
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作者：
Feng-chao Liu;Zongyi Ma;M. Tan
变形镁合金的广泛应用因其室温成形性不足而受到阻碍。新开发的 Mg-Mn-Ce 合金的拉伸延展性通过搅拌摩擦加工 (FSP) 得到了显着提高。搅拌区的微观结构主要表现为细长晶粒，由于连续动态再结晶的高贡献，这些细晶粒被小角度晶界高度分离。获得了具有高基面倾斜角的新{0002}分布，当沿FSP方向拉动样本时，该分布有利于基面滑移。镁晶体增强的基底滑移和晶体取向演化都增加了 FSP 样品的应变硬化指数，从而提高了其拉伸延展性。基于局部织构演化建立的材料流动模型可以合理解释FSP试样在拉伸试验中出现翘曲和高法向各向异性比的现象。
The widespread application of wrought magnesium alloys is hampered by their insufficient formability at room temperature. The tensile ductility of a newly developed Mg-Mn-Ce alloy has been dramatically improved by friction stir processing (FSP). The microstructure of the stir zone was characterized mainly by elongated fine grains which were highly separated by low-angle grain boundaries because of the high contribution of continuous dynamic recrystallization. A new {0002} distribution with high basal plane tilt angles which facilitated basal slip when the specimens were pulled along the FSP direction was obtained. Both the enhanced basal slip and crystallographic orientation evolution of Mg crystals increased the strain hardening exponent of the FSP specimen, and hence improved its tensile ductility. A material flow model, developed based on the local textural evolution, could reasonably explain the phenomenon that the FSP specimen exhibited warping and a high normal anisotropy ratio during tensile test.