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Effect of Grain Structure on the Mechanical Properties of Al-Zn-Mg-Sc Alloys with T6 State
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-18 , DOI: 10.1007/s11665-020-05120-1
Y. F. Hou , C. Y. Liu , B. Zhang

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 <111> texture than the other three samples, and the T6 FSP samples exhibited the finest grains, with average grain size (AGS) of 5 μm. 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 μm. All the samples exhibited a low density of dislocations and contained coarse grain boundary precipitates, Al3(Sc,Zr) phases, and a high density of η′ phase. The T6 HR sample exhibited the highest strength mainly due to its strong <111> 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.



中文翻译:

晶粒结构对T6态Al-Zn-Mg-Sc合金力学性能的影响

采用摩擦搅拌工艺(FSP)并通过不同的轧制工艺制备出了具有不同晶粒结构的Al-Zn-Mg-Sc合金。经过T6处理后的热轧(HR)样品比其他三个样品表现出更强的<111>织构,并且T6 FSP样品表现出最细的晶粒,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,并且T6 FSP + HR中的AGS达到126μm。所有样品均显示出低的位错密度,并含有粗糙的晶界沉淀Al 3(Sc,Zr)相和高密度的η'相。T6 HR样品表现出最高的强度,主要是由于其强大的<111>织构和合理的晶粒尺寸,而T6 FSP样品则由于其细等轴晶粒结构而具有最高的延展性,从而可以促进应力的重新分布并防止应变局部化在张力过程中。

更新日期:2020-09-20
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