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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Grain Structure on the Mechanical Properties of Al-Zn-Mg-Sc Alloys with T6 State
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Effect of Grain Structure on the Mechanical Properties of Al-Zn-Mg-Sc Alloys with T6 State

机译：晶粒结构对T6状态的α-Zn-Mg-Sc合金机械性能的影响

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摘要

Al-Zn-Mg-Sc alloys with different grain structures were fabricated using friction stir processing (FSP) and rolling with different routes. The hot rolling (HR) sample after T6 treatment exhibited stronger texture than the other three samples, and the T6 FSP samples exhibited the finest grains, with average grain size (AGS) of 5 mu m. Cold or hot rolling before T6 treatment led to grain coarsening in the T6 FSP samples, and the AGS in the T6 FSP + HR reached 126 mu m. All the samples exhibited a low density of dislocations and contained coarse grain boundary precipitates, Al-3(Sc,Zr) phases, and a high density of eta ' phase. The T6 HR sample exhibited the highest strength mainly due to its strong texture and reasonable grains size, and the T6 FSP sample exhibited the highest ductility due to its fine equiaxed grain structure, which can promote the redistribution of stresses and prevent strain localization during the tension process.
机译：采用搅拌摩擦加工（FSP）和不同轧制路线制备了不同晶粒结构的Al-Zn-Mg-Sc合金。T6处理后的热轧（HR）样品显示出比其他三个样品更强的织构，T6 FSP样品显示出最细的晶粒，平均晶粒尺寸（AGS）为5μm。T6处理前的冷轧或热轧导致T6 FSP样品中的晶粒粗化，T6 FSP+HR中的AGS达到126μm。所有样品均显示出低密度的位错，并含有粗晶界析出物、Al-3（Sc，Zr）相和高密度的eta'相。T6 HR试样表现出最高的强度主要是由于其强大的织构和合理的晶粒尺寸，而T6 FSP试样表现出最高的延展性是由于其细等轴晶粒结构，这可以促进应力的重新分布，并防止拉伸过程中的应变局部化。

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