Multilayered aluminum composites (ARB6-2N/4 N) with alternating layers of commercially purity aluminum (2N–Al) and high-purity aluminum (4N–Al) were fabricated by six cycles of accumulative roll bonding (ARB) processing. The ARB processed specimens were annealed at different temperatures. It was found that heterogeneous lamellar microstructures composed of fine-grained 2 N (hard) layers and coarse-grained 4 N (soft) layers formed in the specimens. The specimen with the heterogeneous layered structure showed a large tensile elongation with a strength following the rule of mixture. Digital image correlation analyses revealed that the deformation bands with high local strains formed in the 4 N layers but were terminated at the interfaces between the 2 N and the 4 N layers in the multilayered aluminum composites, accommodating the deformation between the hard (2 N) layers and the soft (4 N) layers during tensile deformation. Termination of the strain localization delayed macroscopic necking of the materials, leading to a better combination of high strength and good ductility in the multilayered aluminum composites.

多层铝复合材料（ARB6-2N / 4 N）具有六层交替的累积辊压粘合（ARB）工艺，具有商业纯铝（2N–Al）和高纯铝（4N–Al）的交替层。ARB处理过的样品在不同温度下退火。发现在试样中形成了由细颗粒的2 N（硬）层和粗颗粒的4 N（软）层组成的非均质层状微结构。具有非均质层状结构的样品表现出大的拉伸伸长率，其强度遵循混合规则。数字图像相关分析表明，在多层铝复合材料中，高变形应变带形成在4 N层中，但终止于2 N和4 N层之间的界面，适应拉伸变形期间硬质（2 N）层和软质（4 N）层之间的变形。应变局部化的终止延迟了材料的宏观颈缩，从而在多层铝复合材料中更好地组合了高强度和良好的延展性。