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Heterogeneity and Homogeneity in 2/4 N Multilayered Al Fabricated by Accumulative Roll Bonding and Annealing
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-16 , DOI: 10.1007/s11665-020-05081-5
Xiaojuan Jiang , Si Gao , Ling Zhang , Guilin Wu , Xiaoxu Huang , Nobuhiro Tsuji

Multilayered Al sheets having alternative stacking of 2 N Al (99.21 wt.% purity, N is short for nine) and 4 N Al (99.993 wt.% purity, N is short for nine) with various layer thicknesses from 16 to 1 μm were fabricated by 6 to 10 accumulative roll bonding (ARB) cycles, followed by annealing. The effects of layer thickness and annealing treatment on mechanical properties were studied. In all samples, the grain sizes in the 4 N layers were larger than those in the 2 N layers due to the purity difference. The grain size and mechanical properties saturated after 6 ARB cycles, but the layer thickness gradually decreases with increasing cycles and accordingly, more homogeneous microstructures were obtained with higher cycles. After annealing, heterogeneous structures were retained in 6-cycle sample, while most homogenous structures were observed in 10-cycle sample. Yield-drop phenomenon widely observed in the homogeneous samples disappeared in the heterogeneous 6-cycle sample after annealing at 225 and 250 °C.



中文翻译:

累积辊压结合和退火制备的2/4 N多层Al中的异质性和均质性

具有交替堆叠的2 N Al(99.21 wt。%的纯度,N表示九个短)和4 N Al(99.993 wt。%的纯度,N表示九个短)的多层Al板具有16至1μm的不同层厚通过6到10个累积辊压粘合(ARB)循环制造,然后进行退火。研究了层厚和退火处理对力学性能的影响。在所有样品中,由于纯度差异,4 N层中的晶粒尺寸均大于2 N层中的晶粒尺寸。晶粒尺寸和机械性能在6个ARB循环后达到饱和,但是随着循环次数的增加,层厚度逐渐减小,因此,随着循环次数的增加,可以获得更均匀的微观结构。退火后,异质结构保留在6个循环的样品中,而在10个周期的样品中观察到大多数同质结构。在225和250°C退火后,在均相样品中广泛观察到的屈服下降现象在异质6循环样品中消失。

更新日期:2020-09-16
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